Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2006. / Härtill 4 uppsatser.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T13:30:32Z No. of bitstreams: 5 license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) 20.pdf: 296814 bytes, checksum: 27fb71ee580d123540c238ee8b4b7b23 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20904 bytes, checksum: e09bf99e64678e4285abf3ef3e05412d (MD5) license_rdf: 23422 bytes, checksum: b145eda3d84bdc4f56b389c0ab98d368 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T16:34:15Z (GMT) No. of bitstreams: 5 license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) 20.pdf: 296814 bytes, checksum: 27fb71ee580d123540c238ee8b4b7b23 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20904 bytes, checksum: e09bf99e64678e4285abf3ef3e05412d (MD5) license_rdf: 23422 bytes, checksum: b145eda3d84bdc4f56b389c0ab98d368 (MD5) / Made available in DSpace on 2015-02-27T16:34:15Z (GMT). No. of bitstreams: 5 license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) 20.pdf: 296814 bytes, checksum: 27fb71ee580d123540c238ee8b4b7b23 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20904 bytes, checksum: e09bf99e64678e4285abf3ef3e05412d (MD5) license_rdf: 23422 bytes, checksum: b145eda3d84bdc4f56b389c0ab98d368 (MD5) Previous issue date: 2010 / Objetivou-se, com este trabalho, selecionar clones de batata-doce com potencial de utiliza??o na alimenta??o humana e animal. O trabalho foi realizado no setor de Olericultura e nos Laborat?rios de T?cnicas Diet?ticas e Tecnologia de Biomassa do Cerrado do Campus JK da UFVJM, em Diamantina-MG. Foram avaliados a produtividade total de ra?zes, produtividade comercial de ra?zes, peso m?dio de raiz comercial, formato de ra?zes, resist?ncia a insetos do solo, teor de mat?ria seca das ra?zes e caroten?ides totais. Al?m dessas caracter?sticas foram avaliadas tamb?m as caracter?sticas f?sicas e sensoriais: colora??o da polpa, textura e maciez, do?ura da polpa, tempo de cozimento e aceitabilidade das ra?zes aos clones de batata-doce. Para estudo do potencial de utiliza??o na alimenta??o animal foram avaliados a produtividade de massa verde, o teor de mat?ria seca e a produtividade de massa seca das ramas. J? a silagem das ramas foi avaliada quanto ao teor de mat?ria seca, prote?na bruta, FDA, FDN, NDT, pH, F?sforo, C?lcio e S?dio. O experimento foi conduzido em blocos ao acaso (DBC), compreendendo 12 clones e 4 repeti??es. As parcelas constaram de uma fileira de 4,5 m de comprimento, utilizando o espa?amento de 1,0 m entre fileiras, por 0,30 m entre plantas, totalizando 15 plantas por parcela. Para a an?lise sensorial foram utilizados 40 provadores, n?o treinados, para cada clone. Os clones avaliados fazem parte do banco de germoplasma da UFVJM, sendo: BD-06, BD-25, BD-15, BD-38, Cambraia, BD-31-TO, BD-67, BD-45, BD-42, BD-54 e as cultivares Brazl?ndia Branca e Brazl?ndia Rosada. Foram observadas diferen?as significativas entre os clones para as caracter?sticas de produtividade comercial de ra?zes, resist?ncia a insetos, teor de mat?ria seca e caroten?ides totais das ra?zes dos clones de batata-doce. Os clones avaliados apresentaram caracter?sticas de produ??o comparadas ?s cultivares comerciais Brazl?ndia Branca e Brazl?ndia Rosada. Os clones BD-25, BD-54, BD-31-TO e Cambraia obtiveram notas para avalia??o quanto ? resist?ncia a insetos de solo abaixo de 2,0, sendo considerados resistentes a insetos de solo. Os clones BD-54, BD-31-TO, Cambraia e BD-45 apresentaram alto teor de mat?ria seca nas ra?zes. J? o maior conte?do de caroten?ides nas ra?zes foi obtido pelo clone BD-67. Os clones BD-06, BD-38, Cambraia, BD-31-TO, BD-67, BD-42, BD-54 e as cultivares Brazl?ndia Branca e Brazl?ndia Rosada apresentaram ?ndice de aceitabilidade acima de 70%, sendo aceitos pelos consumidores. Os clones avaliados apresentaram produtividade de massa verde e de massa seca das ramas comparadas ?s cultivares comerciais Brazl?ndia Branca e Brazl?ndia Rosada. N?o houve diferen?a na produtividade de massa verde e de massa seca das ramas entre os clones de batata-doce. N?o foram encontradas diferen?as entre os clones quanto ao teor de prote?na bruta da silagem de ramas. As ramas de batata-doce da maioria dos clones estudados apresentam potencial de utiliza??o na alimenta??o animal, tanto na forma fresca como na forma de silagem. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010. / ABSTRACT The objective of this study was to select clones of sweet potato with potential for use in human and animal feed. The work was carried out at the Vegetable and Dietetic Techniques Laboratory and Biomass Technology of Cerrado of Campus JK - UFVJM in Diamantina-MG. We evaluated the total yield of roots and commercial yield of roots, average weight of commercial roots, shape of roots, soil resistance to insects, dry matter content of roots and total carotenoids. Besides these characteristics there were also evaluated the physical and sensorial characteristics: the squash color, texture and softness, sweetness of the squash, cooking time and acceptability of sweet potato clones in the roots. In the aim to study the potential use of these clones in animal feed there were evaluated the yield of green matter, dry matter content and yield of dry mass of branches. The silage of the branches was evaluated for dry matter, crude protein, ADF, NDF, TDN, pH, Phosphorus, Calcium and Sodium. The experiment was conducted in a randomized block design (RBD), including 12 clones and 4 replications. The plots consisted of one row 4.5 m long, using the 1.0 m spacement between rows by 0.30 m between plants, totaling 15 plants per plot. For the sensorial analysis were used 40 untrained tasters for each clone. The clones are part of the germplasm bank of UFVJM, as follows: BD-06, BD-25 BD-15 BD-38, Batiste, BD-TO-31, BD-67 BD-45 BD-42, BD-54 and Pink and White Brazlandia. There were observed significant differences between the clones for the characteristics of commercial yield, resistance to insects, dry matter content and total carotenoids in roots of sweet potato clones. The evaluated clones showed similar characteristics of yield when compared to commercial cultivars Pink and White Brazlandia. The clones BD-25 BD-54 BD-31-TO and Batiste scored in evaluation for resistance to insects of soil below 2.0 and were considered resistant to soil insects. Clones BD-54 BD-31-TO, Batiste and BD-45 had high dry matter content in roots. The highest content of carotenoids in roots was obtained by clone BD-67. Clones BD-06, BD-38, Batiste, BD-TO-31, BD-67 BD-42 BD-54 and Pink and White Brazlandia had a level of acceptability above 70%, being accepted by consumers. The clones showed productivity of green mass and dry mass of branches similar to Pink and White Brazlandia commercial cultivars. There was no difference in yield of green mass and dry weight of branches among the clones of sweet potato. There were no differences between the clones on the crude protein content of silage forms. The branches of sweet potatoes in the majority of the clones showed potencial use for animal feed, either as fresh as in the form of silage.

Aiming to characterize morphologically the genotypes of sweet potato, to estimate the genetic divergence and to evaluate the yield performance in the edaphoclimatics conditions in the municipality of Junqueiro, Alagoas, Brazil, an experiment was developed, consisting of two varieties and nine clones, in the randomized blocks design with three replications. For morphological characterization, were used 21 descriptors, being fourteen of the shoot and seven of the storage roots. To evaluate the genetic divergence, were used two methodologies: principal components and the generalized Mahalanobis distance, being the genotypes grouped by Tocher method. For the evaluation of the yield performance of the genotypes, were conducted variance analysis, with the averages confronted by Scott-Knott test (P < 0.05). The results indicate there phenotypic variability between the traits of shoot and storage root of the genotypes of sweet potato evaluated. In the estimation of the genetic divergence from principal components analysis, the general form of the mature leaf, the immature leaf color and secondary color of the stem were the traits that most contributed to the divergence of the shoot, explaining 77.08% of the variability existing in the first three principal components. In storage roots, the format, the defect of the surface and the intensity of the predominant color, were the traits that most contributed to the divergence, achieving explain 86.79% of the variability existing in the first three principal components. The acquisition of six groups among the eleven genotypes studied, showed a significant divergence between the genotypes of sweet potato based on the morphological descriptors. When used the generalized Mahalanobis distance methodology, the clone 6 and the variety Sergipana, by their distances of high magnitude, were the most dissimilar (D2 = 244.3). The traits that contributed mostly to the genetic dissimilarity were the marketable root yield (30.79%), the shoot phytomass yield (16.56%) and the internode length (12.84%). The taking of five groups among the eleven genotypes studied showed a significant genetic divergence between the genotypes of sweet potato. The clones 6 and 11 showed the highest marketable roots yield, with 12.08 and 9.08 t ha-1, respectively. The clones 8, 14 and the variety Rainha Prata had the highest shoot phytomass yield, with 5.42, 5.17 and 5.83 t ha-1. These results suggest new prospects for the cultivation of sweet potato in the region of Junqueiro, Alagoas. It was concluded that there is genetic and phenotypic variation among genotypes of sweet potato, explained by morphological characterization and the two techniques to estimate the genetic divergence. According to the results presented in this paper, the Breeding Program of CECA - UFAL may to adopt three measures: the first is the assessment of clones 6 and 11, most yields, in field testing in the municipality of Junqueiro, aiming stability tests, to launch them as varieties. The second will be realization of artificial crosses aiming based in the genetic distances and the per se yields of parents (clones 6 and 8). And the third measure will be the formation of a population with large genetic basis, thereby increasing the probability of obtaining superior genotypes in the segregating generations. / Com o objetivo de caracterizar morfologicamente os genótipos de batata-doce, estimar a divergência genética e avaliar o desempenho produtivo nas condições edafoclimáticas do município de Junqueiro, Estado de Alagoas, foi desenvolvido um experimento, composto por duas variedades e nove clones, no delineamento em blocos casualizados com três repetições. Para a caracterização morfológica, foram utilizados 21 descritores, sendo quatorze da parte aérea e sete das raízes. Para estimar a divergência genética, foram utilizadas duas metodologias: componentes principais e distância generalizada de Mahalanobis, sendo os genótipos agrupados pelo método de Tocher. Para a avaliação do desempenho produtivo dos genótipos, foram realizadas análises de variância, sendo as médias confrontadas pelo teste Scott-Knott (P < 0,05). Os resultados indicam haver variabilidade fenotípica entre os caracteres da parte aérea e os da raiz dos genótipos de batata-doce avaliados. Na estimativa da divergência genética a partir da metodologia dos componentes principais, a forma geral da folha madura, a cor da folha imatura e a cor secundária da haste foram às características que mais contribuíram para a divergência da parte aérea, explicando 77,08% da variabilidade existente nos três primeiros componentes principais. Nas raízes, o formato, o defeito da superfície e a intensidade da cor predominante, foram os caracteres que mais contribuíram para a divergência, conseguindo explicar 86,79% da variabilidade existente nos três primeiros componentes principais. A obtenção de seis grupos entre os onze genótipos analisados evidenciam uma significativa divergência entre os genótipos de batata-doce com base nos descritores morfológicos. Quando utilizado a metodologia da distância generalizada de Mahalanobis, o clone 6 e a variedade Sergipana, por suas distâncias de alta magnitude, foram as mais dissimilares (D2 = 244,3). As variáveis que mais contribuíram para a dissimilaridade genética foram a produtividade de raízes comerciais (30,79%), a produtividade de fitomassa da parte aérea (16,56%) e o comprimento do entrenó (12,84%). A obtenção de cinco grupos entre os onze genótipos analisados evidenciam uma significativa divergência genética entre os genótipos de batata-doce. Os clones 6 e 11 apresentaram as maiores produtividades de raízes comerciais, com 12,08 e 9,08 t ha- 1, respectivamente. Os clones 8, 14 e a variedade local Rainha Prata apresentaram as maiores produtividades de fitomassa da parte aérea, com 5,42; 5,17 e 5,83 t ha-1. Estes resultados apontam novas perspectivas para o cultivo de batata-doce na região de Junqueiro, Estado de Alagoas. Diante do exposto, pode-se concluir que existe variabilidade fenotípica e genética entre os genótipos de batata-doce, explicado pela caracterização morfológica e pelas duas técnicas para estimar a divergência genética. De acordo com os resultados apresentados nesta pesquisa, o Programa de Melhoramento do CECA UFAL poderá adotar três medidas: a primeira será a avaliação dos clones 6 e 11, mais produtivos, em ensaios de campo no município de Junqueiro, Estado de Alagoas, visando testes de estabilidade, para lançá-los como variedades. A segunda será a realização de cruzamentos direcionados com base nas distâncias genéticas e nos rendimentos per se dos genitores (clones 6 e 8). E a terceira medida será a formação de uma população de ampla base genética, aumentando assim, a probabilidade de obtenção de genótipos superiores nas gerações segregantes.

Submitted by JUAN DAVID SOLANO MENDONZA null (juan.solanomendoza@gmail.com) on 2017-04-19T18:30:02Z No. of bitstreams: 1 dissertaçao JUAN MENDOZA.pdf: 1111206 bytes, checksum: 0b4a862173ec55a33d92959d7331d935 (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-19T19:56:57Z (GMT) No. of bitstreams: 1 solanomendoza_jd_me_bot.pdf: 1111206 bytes, checksum: 0b4a862173ec55a33d92959d7331d935 (MD5) / Made available in DSpace on 2017-04-19T19:56:57Z (GMT). No. of bitstreams: 1 solanomendoza_jd_me_bot.pdf: 1111206 bytes, checksum: 0b4a862173ec55a33d92959d7331d935 (MD5) Previous issue date: 2017-02-22 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A batata-doce é uma das principais hortaliças cultivadas no mundo, as suas raízes tuberosas têm múltiplos usos na alimentção humana e animal e na produção industrial de farinha, amido e etanol. Os teores de compostos biativos, caracteristicas fisico-quimicas de quailidade pós-colheita e produtividade, podem diferir entre genótipos e idade da planta. O Vale do Ribeira é uma região de comunidades tradicionais que mantêm diferentes acessos de batata-doce. Este estudo foi realizado de fevereiro a outubro de 2015, o objetivo principal foi realizar a caracterização físico-química e de produtividade de três acessos de batata-doce pertencentes ao Banco de Germplasma da Universidade Estadual Paulista.Registro. As análises do experimento foram feitas nos acessos VR 13-01 (casca roxa e polpa roxa fortemente pigmntada), VR13-11 (casca rosa e polpa branca) e VR13-50 (casca creme e polpa branca). O delineamento experimental foi em blocos casualizados com seis repetições por tratamento e cada parcela tinha 5 plantas.O espaçamento de plantio entre plantas foi de 0,25 m e 0,80 m entre linhas. As avaliações das analises físico-químicas, compostos bioativos e produtividade foram feitas aos 120,150 e 180 dias após o plantio. Foram determinados a produçao total de matéria fresca da parte aérea, produçao total de matária seca da raiz, produtividade total de raizes, produtividade comercial de raízes, produção de raizes não comercias , teor de sólidos solúveis , teor de amido, comteúdo de compostos fenólicos totais, flavonoides totais, antocianinas totais e capacidade antioxidante. As características selecionadas pela PCA foram submetidas a análise de variância, complementadas pelo teste de Scott-Knott, a 5% de probabilidade. Considerou-se significativo quando p<0,05. Comparando os três acessos o VR 13­ 01 mostrou os maiores teores de sólidos solúveis (16,6 ° Brix), antocianinas totais (111,6 mg 100 g;1 e o VR13­50 apresentou o maior teor de amido (25,3%) e produtividades mais elevadas ( 43.011kg ha-1). / The sweet potato is one the most grown vegetable crops in the world, its storage roots have multiple uses as human and animal foods and in industrial production of flour, starch and ethanol. The starch and sugar content may differ genotypes and harvest season. The Vale do Ribeira region has traditional communities keep different accessions of sweet potato. This study was conducted from February to October 2015, and main objetive was the physico-chemical characterization, bioactive compounds and productivity of three accessions of sweet potato belonging to the Germplasn Bank of Universidad Estadual Paulista. Accession were VR 13-01 (purple skin and strongly purple pulp).VR13-11( lightly purple skin and white pulp) and VR13-50 ( cream skin and white pulp).The experimental design was randomized blocks with six replications per treatment and each plot had 5 plants. The planting distance between plants was 0.25 m and 0.80 m between rows. The biochemical , physico chemical characterization and production yields was made 120,150 and 180 days after planting. The total productions yield, soluble solids content, and starch content were determined and significant differences among accessions obtained by ANOVA and means separated by a Scott-Knott test. Comparing all three accessions. VR13-01 showed highhest soluble solid content (16,6° Brix), anthocyanin content (111,6 mg 100-1 and accessions VR13-50 showed the highest starch content (25,3 %) and the highest production yields (43.011 Kg ha 1).

Sweet potato [Ipomoea batatas (L.) Lam] is technically a perennial plant, cultivated and explored as an annual crop. Thus, the identification of the cultivation cycle and sweet potato clones is important for a better utilization of this crop, in both, human and animal nutrition, as for ethanol production. The aim of this work was to evaluate the performance of sweet potato clones grown in different cultivation cycles. The experimental design was a randomized block design, in a split-plot scheme, with three replications. We tested in the plots three cultivation cycles (3, 5 and 7 months), and in the split plots, six sweet potato clones (accessions IBP-007, IBP-038, IBP-075, IBP-079 and IBP-149, and cultivar Brazlândia Rosada). The experiment was carried out at the Research Farm "Campus Rural da UFS", located in the municipality of São Cristovão-SE. The analyzed variables were: survival, damages caused by soil insects, fresh and dry weight of the aerial part, total root yield, content of root dry matter, starch and amylose, and yield of starch and ethanol. All variables were subjected to analysis of variance with the F test, and when significant, the means were compared by the Skott-Knott test at 5% probability. The lowest survival rates occurred in the seventh month of cultivation (51.11%), together with the greatest damage caused by soil insects (4.29), where the clones IPB-038 (2.84), IPB-075 (3.01) and IPB-149 (2.88) showed resistance at the seven month cultivation cycle. Clone IPB-007 presented high values of fresh (14.07 t.ha-1) and dry weight (2.81 t.ha-1) of the aerial part in all the cultivation cycles, presenting also high yield of roots (33.16 t.ha-1), starch (6.63 t.ha-1) and ethanol (4,379 L.ha-1). For content of root dry matter (38.32%) and starch (26.70%), and ethanol yield (176.26 L.t-1), the clone IPB-149 stood out. There was no significant difference in amylose content. The starch content (13.94%) and the yield of roots (7.53 t.ha-1), starch (1.64 t.ha-1) and ethanol (1,034 L.ha-1 and 92.04 L.t-1) were lower for most of the clones evaluated with three months of cultivation. We recommend the use of the cultivation cycle of five months. / A batata-doce [Ipomoea batatas (L.) Lam.] é tecnicamente uma planta perene, plantada e explorada como anual. Sendo assim, a identificação do ciclo de cultivo e de clones de batata-doce é importante para um melhor aproveitamento dessa cultura, tanto na alimentação humana e animal, como para produção de etanol. O objetivo do presente trabalho foi avaliar o desempenho de clones de batata-doce cultivados em diferentes ciclos de cultivo. O delineamento experimental foi o de blocos casualizados, em esquema de parcelas subdivididas, com três repetições. Foram testados nas parcelas três ciclos de cultivo (3, 5 e 7 meses), e nas subparcelas, seis clones de batata-doce (acessos IBP-007, IBP-038, IBP-075, IBP-079 e IBP-149, e a cultivar Brazlândia Rosada). O experimento foi implantado na Fazenda Experimental Campus Rural da UFS , localizada no Município de São Cristovão-SE. As variáveis analisadas foram: sobrevivência, danos causados por insetos de solos, massa fresca e seca de parte aérea, produtividade total de raízes, teor de matéria seca de raiz, amido e amilose e rendimento de amido e etanol. Todas as variáveis foram submetidas à análise de variância com teste F e, quando significativa, as médias foram comparadas pelo teste de Skott-Knott ao nível de 5% de probabilidade. Os menores índices de sobrevivência ocorreram no sétimo mês de cultivo (51,11%), juntamente com os maiores danos causados por insetos de solo (4,29), onde os clones IPB-038 (2,84), IPB-075 (3,01) e IPB-149 (2,88) apresentaram resistência no ciclo com sete meses. O clone IPB-007 apresentou elevados valores de massa fresca (14,07 t.ha-1) e seca (2,81 t.ha-1) de parte aérea, em todos os ciclos de cultivo, apresentando também, alta produtividade de raiz (33,16 t.ha-1), amido (6,63 t.ha-1) e etanol (4.379 L.ha-1). Já para teor de matéria seca de raiz (38,32%) e amido (26,70%) e rendimento de etanol (176,26 em L.t-1), o clone IPB-149 se destacou. Não houve diferença significativa para o teor de amilose. O teor de amido (13,94%) e o rendimento de raiz (7,53 t.ha-1), amido (1,64 t.ha-1), e etanol (1.034 L.ha-1 e 92,04 L.t-1) foram menores para a maioria dos clones avaliados no ciclo com três meses de cultivo. Recomenda-se usar o ciclo de cultivo de cinco meses.

Submitted by Maria Beatriz Vieira (mbeatriz.vieira@gmail.com) on 2018-06-11T16:27:45Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) resumo_dissertacao_daniele_de_souza_masiero.pdf: 23649 bytes, checksum: 3c666bef05b41b7c3704d03fde630a6b (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-06-11T16:56:41Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) resumo_dissertacao_daniele_de_souza_masiero.pdf: 23649 bytes, checksum: 3c666bef05b41b7c3704d03fde630a6b (MD5) / Made available in DSpace on 2018-06-11T16:56:42Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) resumo_dissertacao_daniele_de_souza_masiero.pdf: 23649 bytes, checksum: 3c666bef05b41b7c3704d03fde630a6b (MD5) Previous issue date: 2017-06-27 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / O cultivo in vitro é uma importante ferramenta para a propagação da batata-doce e diferentes fatores podem interferir na exequibilidade desta técnica, como a composição do meio de cultura e o microambiente no qual as plantas são expostas. O presente estudo teve como objetivo avaliar o desempenho das cultivares BRS Amélia, BRS Cuia e BRS Rubissol de batata-doce, cultivadas in vitro em duas concentrações de sacarose, duas combinações de espectro luminoso e dois sistemas de cultivo. Para isso o trabalho foi dividido em três experimentos: no primeiro, testou-se duas concentrações de sacarose em biorreator de imersão temporária configurado na combinação de espectro vermelho e branco; no segundo utilizou-se duas concentrações de sacarose em biorreator de imersão temporária configurado na combinação de espectro vermelho e azul; no terceiro, testou-se duas concentrações de sacarose em meio semissólido configurado na combinação de espectro vermelho e branco. O delineamento experimental utilizado foi inteiramente casualizado, em esquema fatorial 2x3: duas concentrações de sacarose (15g L-1 ou 30g L-1) e 3 cultivares (BRS Amélia, BRS Cuia e BRS Rubissol). As variáveis analisadas foram: comprimento de parte aérea, número médio de folhas, número e comprimento de raízes, número e comprimento de brotações, índices de clorofila a, b e total e porcentagem de aclimatização. Para os três experimentos o uso de 30g L-1 de sacarose no meio de cultivo resultou nas maiores médias em todas as variáveis analisadas e a cultivar BRS Cuia foi a que apresentou o melhor desempenho nas condições estudadas. No sistema semissólido foi possível verificar um grande número e comprimento de raízes, enquanto que no sistema de imersão temporária foi verificada presença de brotações em todas as cultivares e maiores médias de comprimento de parte aérea. Concluiu-se que a concentração de 30g L-1 de sacarose no meio de cultura proporciona taxas satisfatórias de crescimento e aclimatização das três cultivares em estudo, sendo recomendada para a micropropagação da espécie. A combinação de espectro luminoso vermelho e azul proporciona maior comprimento de parte aérea, número de folhas e comprimento de raiz quando comparado ao espectro vermelho e branco. A „BRS Rubissol‟ tem melhor desempenho no sistema convencional, a „BRS Amélia‟ no sistema de imersão temporária, enquanto a „BRS Cuia‟ desenvolve-se igualmente independente do sistema de cultivo utilizado. / In vitro cultivation is an important tool for the propagation of sweet potatoes and different factors may interfere with the feasibility of this technique, such as the composition of the culture medium and the microenvironment in which the plants are exposed. The objective of this study was to evaluate the performance of BRS Amélia, BRS Cuia and BRS Rubissol sweet potato cultivars grown in vitro in two concentrations of sucrose, two combinations of light spectrum and two cultivation systems. For the work in division in three experiments: in the first, two concentrations of sucrose in temporary immersion bioreactor configured in the combination of red and white spectrum were tested; In the second, two concentrations of sucrose in a temporary immersion bioreactor configured in the combination of red and blue spectrum are used; In the third, two concentrations of sucrose in semisolid medium configured in the red and white spectrum combination were tested. The experimental design was completely randomized in a factorial 2x3: two concentrations of sucrose (15g L-1 or 30g L-1) and 3 cultivars (BRS Amélia, BRS Cuia and BRS Rubissol). The analyzed variables were: shoot length, number of leaves, number and length of roots, number and length of buds, chlorophyll a, b and total rate and percentage of acclimatization. For the three experiments, the use of 30g L-1 of sucrose in the culture medium resulted in the highest averages in all analyzed variables and the cultivar BRS Cuia was the one that presented the best performance under the conditions studied. In the semisolid system it was possible to verify a large number and length of roots, whereas in the temporary immersion system, the presence of sprouts was verified in all the cultivars and larger averages of shoot length. It was concluded that the concentration of 30 g L-1 of sucrose in the culture medium provides satisfactory rates of growth and acclimatization of the three cultivars under study, being recommended for the micropropagation of the species. The combination of red and blue light spectrum provides greater shoot length, number of leaves and root length when compared to the red and white spectrum. 'BRS Rubissol' performs better in the conventional system, 'BRS Amelia' in the temporary immersion system, while 'BRS Cuia' is also developed independent of the culture system used.

Sweetpotato (Ipomoea batatas (L.) Lam.) is a root crop well established throughout the world's tropical and sub-tropical regions. Despite sweepotato's importance, it has been under-researched relative to many other major crops. The main objective of this thesis is to contribute to a fuller understanding of the genetic and physiological factors underlying the production of sweetpotato storage roots for human consumption. The sweetpotato genome is diverse and subject to high levels of natural somatic mutation. Applying the AFLP (amplified fragment length polymorphism) technique allowed a direct comparison of inter and intra-cultivar DNA (deoxyribonucleic acid) base sequence variation. Analysis of the variation indicated that although sweetpotatoes are clonally propagated, clones show a lack of genetic fidelity to their source. Further, the level of genetic variation within the cultivar 'Owairaka Red' indicated the continuing emergence of distinct new strains. Plant field establishment represents the interaction of both propagation and growth phases of storage root production. A range of establishment techniques were investigated in a field trial under commercial conditions. Sprouts cut from seed roots and held for six days rather than immediate planting improved establishment as measured by growth, at little expense. Plug raised plants also improved establishment, while potentially reducing the degree of intra-cultivar genetic variation. Plant carbohydrate partitioning in three cultivars, 'Beauregard', 'Beniazuma' and 'Owairaka Red' was examined by field trial over the period of storage root growth. While cultivars differed in the proportions of dry matter partitioned to leaf, stem and root organs, the cultivar specific ratios of leaf to stem dry weight were relatively stable over time. Total storage root dry weight increased with time for all cultivars, but the distribution of storage root grades by size was cultivar specific. Within the storage roots % dry weight increased over time in all cultivars, but total sugar concentration only increased for 'Beauregard' and 'Beniazuma'. Finally, a storage root disorder called 'brown centre' curtails the temperate growing season so was investigated using low temperature storage and a field trial with various nutrition regimes. The disorder was found to be associated with susceptible germplasm, high soil nitrogen and harvest time.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T13:30:36Z No. of bitstreams: 5 50.pdf: 601131 bytes, checksum: 40ec6f06ce6ce603d177d20c34d83fbd (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T19:17:39Z (GMT) No. of bitstreams: 5 50.pdf: 601131 bytes, checksum: 40ec6f06ce6ce603d177d20c34d83fbd (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) / Made available in DSpace on 2015-02-27T19:17:39Z (GMT). No. of bitstreams: 5 50.pdf: 601131 bytes, checksum: 40ec6f06ce6ce603d177d20c34d83fbd (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) Previous issue date: 2012 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / Objetivou-se selecionar gen?tipos de batata-doce mais produtivos e de melhor qualidade nutricional e avaliar a qualidade da silagem de ramas e de ra?zes de batata-doce. Foram realizados dois ensaios. Com o primeiro ensaio objetivou-se selecionar gen?tipos de batata-doce de melhores caracter?sticas de produ??o de ramas e avaliar a composi??o bromatol?gica das ramas emurchecidas de batata-doce e de suas silagens. O experimento foi conduzido na Fazenda Rio Manso, da UFVJM, em Couto Magalh?es de Minas - MG. Foi utilizado o delineamento em blocos ao acaso, com quinze gen?tipos de batata-doce: BD-31TO, BD-26, BD-13, BD-17, BD-22, BD-24, BD-54, BD-56, BD-69, BD-43, BD-44, BD-46, BD-52, BD-35 e a cultivar comercial Brazl?ndia Rosada, com tr?s repeti??es. Apenas para o n?mero de folhas por metro linear n?o foram observadas diferen?as significativas entre os gen?tipos. A maioria dos gen?tipos estudados apresenta m?dia a alta produtividade de massa verde (PMV) e de massa seca das ramas (PMS). Devido ? exist?ncia de correla??o entre o comprimento da haste principal (CH) e a PMS, pode-se em futuros trabalhos mensurar o comprimento da haste visando maiores PMS. N?o foram observadas diferen?as significativas entre os gen?tipos para os teores de carboidratos sol?veis das ramas emurchecidas e silagens das ramas. Foram encontradas diferen?as significativas para os teores de mat?ria seca (MS), cinzas, prote?na bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ?cido (FDA) e lignina. Para as ramas emurchecidas, os gen?tipos BD-26, BD-13, BD-56, BD-46, BD-35 e Brazl?ndia Rosada apresentaram as composi??es bromatol?gicas mais adequadas. O n?mero de folhas na cultura da batata-doce n?o possui rela??o com a qualidade bromatol?gica de suas ramas. Para as silagens das ramas, o gen?tipo BD-56 proporcionou as melhores caracter?sticas bromatol?gicas. Com o segundo ensaio objetivou-se avaliar caracter?sticas de produtividade de ra?zes, a composi??o bromatol?gica das silagens de ra?zes e o potencial de produ??o de prote?na bruta de diferentes gen?tipos batata-doce. Foi utilizado o delineamento em blocos ao acaso, com dez tratamentos e duas repeti??es, sendo os gen?tipos de batata-doce oriundos do banco de germoplasma da UFVJM (BD-31TO, BD-17, BD-22, BD-24, BD-54, BD-69, BD-43, BD-46, BD-52 e BD-35). As parcelas foram compostas por duas leiras de 3,0 m, com 0,90 m entre leiras e 0,30 m entre plantas. Na colheita foram avaliadas as caracter?sticas de produtividade total de ra?zes (PTR) e produtividade comercial de ra?zes (PCR), n?o sendo observadas diferen?as significativas entre os gen?tipos para essas caracter?sticas. As PTR e PCR foram baixas, abaixo da m?dia nacional. Para os teores m?dios de MS, nitrog?nio amoniacal (%N-NH3 NT-1), FDN e lignina houve diferen?as significativas entre os gen?tipos avaliados. Os gen?tipos BD-17, BD-69 e BD-46 originaram silagens de raiz de melhores composi??es bromatol?gicas. A cultura da batata-doce possui alto potencial de produ??o de PB, com destaque para os gen?tipos BD-17, BD-54, BD-43, BD-46 e BD-52. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT The objective of this study was to select genotypes of sweet potato more productive and better nutritional quality and evaluate the quality of silage branches and roots of sweet potato. Two experiments were conducted. With the first experiment was aimed to select genotypes of sweet potato with best features of production of branches and assess the chemical composition of branches wilted sweet potato and its silages. The experiment was conducted at the Fazenda Rio Manso of the UFVJM in the city of Couto Magalh?es de Minas ? MG - Brazil. We used a randomized block design, with fifteen genotypes of sweet potato: BD-31TO, BD-26, BD-13, BD-17, BD-22, BD-24, BD-54, BD-56, BD-69, BD-43, BD-44, BD-46, BD-52, BD-35 and the commercial cultivar Brazl?ndia Rosada, with three replications. Only the number of leaves per linear meter no significant differences were observed among genotypes. Most genotypes has medium to high productivity of green mass (PGM) and dry mass of branches. Due the correlation between the length of the main branch (CB) and productivity of dry mass of branches (PDM), can in future studies to measure the length of the rod aiming higher PDM. No significant differences were observed among genotypes for soluble carbohydrates from branches and wilted silages of branches. Significant differences were found for dry matter (DM), ash, crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and lignin. For the wilted branches, genotypes BD-26, BD-13, BD-56, BD-46, BD-35 and Brazl?ndia Rosada presented better compositions bromatologic. The number of leaves in the culture of sweet potato has no relation with the chemical quality of their branches. For silages of branches, genotype BD-56 have the best qualitative characteristics. The second experiment aimed to evaluate characteristics of root yield, composition of silages of roots and the potential production of crude protein of sweet potato genotypes. We used a randomized block design with ten treatments and two replications, and the sweet potato genotypes from the germplasm bank of UFVJM (BD-31TO, BD-17, BD-22, BD-24, BD-54 , BD-69, BD-43, BD-46, BD-52, BD-35). The plots were composed of two piles of 3.0 m, with 0.90 m between furrows and 0.30 m between plants. At harvest, the characteristics evaluated were total root yields (TRY) and marketable yield of roots (MYR), no differences were observed among genotypes these characteristics. The TRY and MYR were low, below the national average. For the average levels of DM, ammonia nitrogen (% N-NH3.NT-1), NDF and lignin were no significant differences between genotypes. The genotypes BD-17, BD-69 and BD-46 showed the best results of composition of silages roots. The culture of sweet potato has a high potential for production of CP, especially with the genotypes BD-17, BD-54, BD-43, BD-46 and BD-52.

Morphological and anatomical studies demonstrated the root formation characteristics of sweet potato. The presence and importance of preformed root primordia is recorded for the first time. On the vines root primordia are present in sets of four to ten adjacent to the leaf bases. These roots originate from the procambium on both sides of the leaf gap. Macroscopically the root tips of preformed root primordia protruding through the cortex and epidermis of the stems are prominent. The preformed root primordia produce adventitious roots, with pentarch, hexarch or septarch steles. Storage roots will under normal circumstances only originate from undamaged root primordia on the nodes of cuttings, or on nodes of newly formed vines, or from wound roots originating from the cut ends of the stem or leaf cuttings. Lateral roots originating from damaged root primordia, or directly from the adventitious roots, exhibit tetrarch steles and develop into fibrous roots without the potential to develop into storage roots. This understanding of the origin, anatomy and morphology of sweet potato roots should improve production practices, which will contribute to improved crop establishment and increased yield. Differences in the contribution of individual subterranean nodes to storage root yield were studied. On average cuttings with three subterranean nodes produced 3.7 storage roots, with 33.2% on subterranean node 1, 30.0% on node 2 and 36.8% on node3. However, in terms of fresh mass of the storage roots node 1 contributed 45.4%, node 2 contributed 27.1% and node 3 contributed 27.4%. The effect of temperature (20, 24, 28 and 32oC constant), orientation of cuttings (vertical vs. horizontal) and size of cuttings (1 or 3 nodes) on the development of adventitious roots was observed in plant growth chambers. Twenty-one days after planting, the longest total root length of 4m per plant was recorded from the 24oC growth chamber. The effect of soil moisture content on early root development was investigated by wetting and equilibrating sandy soil to 100, 80, 60 and 40% of field capacity. Although the 80% of field capacity treatment resulted in the best root development, differences among treatments were small, demonstrating the capacity of cuttings to successfully establish under a range of soil moisture contents. Changes in dry mass of storage roots, stems, and leaves of three sweet potato cultivars (Awasa-83, Bareda and Falaha) were studied at Awasa and Melkassa. At the final sampling the early maturing cultivar Falaha had diverted a higher proportion of the total dry mass into storage roots at Melkassa because of the early initiation and growth of storage roots. The late maturing cultivar Awasa-83 had a smaller proportion of the total dry mass diverted into the storage roots at both locations because of late root initiation and growth. The high yielding cultivars Bareda at Melkassa, and Awasa-83 at Awasa, had higher crop growth rates and higher net assimilation rates than the other cultivars. The effects of cultivar (Kudadie, Bareda and Awasa-83), planting position (horizontal and vertical), type of planting material (terminal cuttings with and without leaves) and cutting length (20, 25 and 30 cm) on the number and yield of storage roots were quantified in field trials at Awasa and Melkassa. Cultivar Kudadie produced the highest storage root yield at both locations. Horizontal planting of cuttings resulted in the highest total storage root yield at both locations. Cutting length did not affect storage root number and yield. The effect of population density (50,000, 55,555, 75,000, and 100,000 cuttings per hectare) on the performance of the three Ethiopian sweet potato cultivars was studied at Awasa. The highest planting density consistently produced the best root yield, indicating the potential to increase yields with plant populations much higher than normally used. Early maturing cultivar Falaha produced more small and medium storage roots per plant, while the intermediate cultivar Bareda produced more large storage roots. Copyright 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Belehu, T 2003, Agronomical and physiological factors affecting growth, development and yield of sweet potato in Ethiopia, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-07262004-141704 / > / Thesis (PhD (Plant Production and Soil Science))--University of Pretoria, 2005. / Plant Production and Soil Science / unrestricted

PhD (Agric) (Food Science and Technology) / Department Food Science and Technology / In recent years, there has been a lot of interest in orange fleshed sweet potato (OFSP) [Ipomoea batatas (L.) Lam] cultivar, as a cheaper source of vitamin A. In Southern Africa, reports have shown that one in every three children has deficiency in vitamin A. This study investigated the variations in β-carotene (vitamin A precursor) content among selected OFSP cultivars grown in Limpopo Province, South Africa. In addition, the study investigated the effects of location on functional properties, total carotenoids and antioxidant profile of the sweet potato flour as well as their physicochemical, functional and nutritional properties. Four (4) sweet potato cultivars [Dagga, Bophelo, Impilo (orange fleshed) and Mvuvhelo (cream fleshed)] were obtained from two locations, namely, University of Venda (Univen) agricultural experimental farm and Tshiombo irrigation scheme (Tshiombo) and analysed for pasting, functional, physicochemical and nutritional properties. The sweet potato flours from these two locations were also analysed by computed tomographic (CT) scans for flour particle density. Mineral and microstructure of OFSP flours were analysed by scanning electron microscope (SEM). All measurements, except the tristimulus L* a* b* and other colour parameters from five replicates, were performed in triplicate. Statistical analysis was performed using a one-way analysis of variance and means were separated using Duncan’s multiple range test; P < 0.05 was considered to be statistically significant. Pearson’s correlation coefficients were used to determine the correlation among functional, physicochemical, nutritional and pasting properties of sweet potato flour. β-carotene content varied significantly between the two locations from 70.98 ± 0.8 μg/g (Tshiombo) to 86.09 ± 2.0 μg/g (Univen), among cultivars from 1.71 ± 0.0 μg/g (Mvuvhelo) to 201.50 ± 1.0 μg/g (Dagga) and among orange fleshed (Dagga, Bophelo and Impilo) flours from 28.38 ± 0.2 μg/g (Impilo) to 201.50 ± 1.0 μg/g (Dagga). There was a similar trend in the contents of α-carotene to that of β-carotene from the two locations, which ranged from 0.63 ± 0.0 mol/L (Tshiombo) to 1.01 ± 0.0 mol/L (Univen). Mvuvhelo had significantly the lowest α-carotene content (0.50 ± 0.0 mol/L) and Impilo the highest (1.28 ± 0.0 mol/L). The total carotenoids was highest for Impilo (7.56 μg/g) and lowest for Mvuvhelo (1.33 ± 0.1 μg/g) but did not vary significantly (P > 0.05) between ii the locations. The antioxidant activity, based on 2, 2-diphenyl-1picrylhydrazyl (DPPH) free radical scavenging activity, was significantly highest in Bophelo (63.37 ± 0.8 mMAAE ml-1) and lowest in Dagga (26.93 ± 1.4 mMAAE ml-1) flours. The ferric reducing antioxidant power (FRAP) varied significantly across the locations and among the cultivars and ranged from 14.45 ± 0.3 μMTE ml-1 (Tshiombo) to 17.40 ± 1.1 μMTE ml-1 (Univen). FRAP was significantly highest in Impilo (21.12 ± 2.1 μMTE ml-1) and lowest in Mvuvhelo (8.16 ± 2.0 μMTE ml-1). Total carotenoid content positively correlated with DPPH (0.486*), FRAP (0.830**), β-carotene (0.370*), and α-carotene (0.424*). The antioxidant content and the radical scavenging activity were significantly correlated (0.563**). Vitamin A content was significantly lowest (6.88 ± 0.38 μg/g retinol) in Dagga flour and highest (7.97 ± 0.25 μg/g) in Impilo flour. Protein content varied significantly across the two locations and ranged from 4.23% (Tshiombo) to 7.16% (Univen). Dagga had significantly the lowest (3.47%) protein content while Impilo had the highest (7.53%). The fat content of the flours varied significantly between the two locations ranging from 0.63% (Tshiombo) to 1.01% (Univen). The protein content was positively correlated 0.594** and 0.421* to vitamin A and fat contents respectively. The Bophelo colour luminosity was significantly lower (L* 76.2) than the other two OFSP, Dagga (L* 83.51) and Impilo (L* 82.07). Bophelo a* (14.09) also differed significantly across all sweet potato cultivars. All cultivars differed significantly in b* values. Colour intensity (ΔE*) ranged from 15.87 to 38.48 for Mvuvhelo and Bophelo, respectively. Chroma ranged from 87.52 to 84.95 for Dagga and Mvuvhelo respectively. Total starch content was significantly different in all sweet potato cultivars and ranged from 244.07 μg/100 g (Bophelo) to 325.04 mg/g (Dagga). Resistant starch differed significantly in all sweet potato cultivars ranging from 1.21 μg/100 g dwb (Bophelo) to 7.07 μg/100 g dwb (Impilo). Ash content was significantly different in all cultivars and ranged from 3.17% (Dagga) to 3.79% (Bophelo). Water holding capacity (WHC) varied significantly across the two locations and ranged from 1.44 g H2O/g DM (Tshiombo) to 1.72 g H2O/g DM (Univen). Bophelo had significantly the lowest (1.27 g H2O/g DM) WHC and Impilo the highest (1.99 g H2O/g DM). The ash content negatively correlated to total starch (-0.928**) but positively iii correlated to WHC (0.654**). Peak viscosity differed significantly across all cultivars under study and ranged from 126.54 RVU (Bophelo) to 302.36 RVU. (Dagga). There was significant difference in trough viscosity across all cultivars ranging from 55.97 RVU (Impilo) to 280.78 RVU (Dagga). There were significant differences in the final viscosity across all cultivars ranging from 78.99 RVU (Impilo) to 319.26 (Dagga). Peak time viscosity varied significantly across all cultivars ranging from 3.87 min (Impilo) to 8.47 min. (Bophelo). Dagga cultivar had significantly the highest pasting temperature (94.16oC) and Bophelo the lowest (77.75oC). The setback viscosity was significantly highest 51.10 RVU (Mvuvhelo) and lowest 23.01 RVU (Impilo). All cultivars from the two locations consistently showed high potassium content ranging from 0.46% (Impilo) to 1.38% (Dagga) as compared to other minerals such as magnesium, calcium and chlorine which ranged from 0.16% (Impilo) to 0.34%. (Dagga). The CT scans revealed that there was a possibility of evaluating the effect of location on the density of granules of sweet potato flour and also the inherent differences in granular distribution of various sweet potato cultivars. SEM revealed high amounts of potassium, magnesium and chlorine. A profile of physicochemical and functional properties of flour of some of the OFSP cultivars produced in Limpopo province, South Africa has been drawn. This study also highlights the nutritional quality of the flour from four sweet potato cultivars and provides a ranking of flour to help the producers in the selection process. Bophelo flour was ranked the highest in terms of β- and, α-carotenes, total carotenoids and antioxidant capacity while Impilo was ranked highest in terms of functional properties and ash content. This study has highlighted significant differences in a number of parameters measured among the sweet potato cultivars. Therefore, in order to derive the maximum benefit from aIn recent years, there has been a lot of interest in orange fleshed sweet potato (OFSP) [Ipomoea batatas (L.) Lam] cultivar, as a cheaper source of vitamin A. In Southern Africa, reports have shown that one in every three children has deficiency in vitamin A. This study investigated the variations in β-carotene (vitamin A precursor) content among selected OFSP cultivars grown in Limpopo Province, South Africa. In addition, the study investigated the effects of location on functional properties, total carotenoids and antioxidant profile of the sweet potato flour as well as their physicochemical, functional and nutritional properties. Four (4) sweet potato cultivars [Dagga, Bophelo, Impilo (orange fleshed) and Mvuvhelo (cream fleshed)] were obtained from two locations, namely, University of Venda (Univen) agricultural experimental farm and Tshiombo irrigation scheme (Tshiombo) and analysed for pasting, functional, physicochemical and nutritional properties. The sweet potato flours from these two locations were also analysed by computed tomographic (CT) scans for flour particle density. Mineral and microstructure of OFSP flours were analysed by scanning electron microscope (SEM). All measurements, except the tristimulus L* a* b* and other colour parameters from five replicates, were performed in triplicate. Statistical analysis was performed using a one-way analysis of variance and means were separated using Duncan’s multiple range test; P < 0.05 was considered to be statistically significant. Pearson’s correlation coefficients were used to determine the correlation among functional, physicochemical, nutritional and pasting properties of sweet potato flour. β-carotene content varied significantly between the two locations from 70.98 ± 0.8 μg/g (Tshiombo) to 86.09 ± 2.0 μg/g (Univen), among cultivars from 1.71 ± 0.0 μg/g (Mvuvhelo) to 201.50 ± 1.0 μg/g (Dagga) and among orange fleshed (Dagga, Bophelo and Impilo) flours from 28.38 ± 0.2 μg/g (Impilo) to 201.50 ± 1.0 μg/g (Dagga). There was a similar trend in the contents of α-carotene to that of β-carotene from the two locations, which ranged from 0.63 ± 0.0 mol/L (Tshiombo) to 1.01 ± 0.0 mol/L (Univen). Mvuvhelo had significantly the lowest α-carotene content (0.50 ± 0.0 mol/L) and Impilo the highest (1.28 ± 0.0 mol/L). The total carotenoids was highest for Impilo (7.56 μg/g) and lowest for Mvuvhelo (1.33 ± 0.1 μg/g) but did not vary significantly (P > 0.05) between ii the locations. The antioxidant activity, based on 2, 2-diphenyl-1picrylhydrazyl (DPPH) free radical scavenging activity, was significantly highest in Bophelo (63.37 ± 0.8 mMAAE ml-1) and lowest in Dagga (26.93 ± 1.4 mMAAE ml-1) flours. The ferric reducing antioxidant power (FRAP) varied significantly across the locations and among the cultivars and ranged from 14.45 ± 0.3 μMTE ml-1 (Tshiombo) to 17.40 ± 1.1 μMTE ml-1 (Univen). FRAP was significantly highest in Impilo (21.12 ± 2.1 μMTE ml-1) and lowest in Mvuvhelo (8.16 ± 2.0 μMTE ml-1). Total carotenoid content positively correlated with DPPH (0.486*), FRAP (0.830**), β-carotene (0.370*), and α-carotene (0.424*). The antioxidant content and the radical scavenging activity were significantly correlated (0.563**). Vitamin A content was significantly lowest (6.88 ± 0.38 μg/g retinol) in Dagga flour and highest (7.97 ± 0.25 μg/g) in Impilo flour. Protein content varied significantly across the two locations and ranged from 4.23% (Tshiombo) to 7.16% (Univen). Dagga had significantly the lowest (3.47%) protein content while Impilo had the highest (7.53%). The fat content of the flours varied significantly between the two locations ranging from 0.63% (Tshiombo) to 1.01% (Univen). The protein content was positively correlated 0.594** and 0.421* to vitamin A and fat contents respectively. The Bophelo colour luminosity was significantly lower (L* 76.2) than the other two OFSP, Dagga (L* 83.51) and Impilo (L* 82.07). Bophelo a* (14.09) also differed significantly across all sweet potato cultivars. All cultivars differed significantly in b* values. Colour intensity (ΔE*) ranged from 15.87 to 38.48 for Mvuvhelo and Bophelo, respectively. Chroma ranged from 87.52 to 84.95 for Dagga and Mvuvhelo respectively. Total starch content was significantly different in all sweet potato cultivars and ranged from 244.07 μg/100 g (Bophelo) to 325.04 mg/g (Dagga). Resistant starch differed significantly in all sweet potato cultivars ranging from 1.21 μg/100 g dwb (Bophelo) to 7.07 μg/100 g dwb (Impilo). Ash content was significantly different in all cultivars and ranged from 3.17% (Dagga) to 3.79% (Bophelo). Water holding capacity (WHC) varied significantly across the two locations and ranged from 1.44 g H2O/g DM (Tshiombo) to 1.72 g H2O/g DM (Univen). Bophelo had significantly the lowest (1.27 g H2O/g DM) WHC and Impilo the highest (1.99 g H2O/g DM). The ash content negatively correlated to total starch (-0.928**) but positively iii correlated to WHC (0.654**). Peak viscosity differed significantly across all cultivars under study and ranged from 126.54 RVU (Bophelo) to 302.36 RVU. (Dagga). There was significant difference in trough viscosity across all cultivars ranging from 55.97 RVU (Impilo) to 280.78 RVU (Dagga). There were significant differences in the final viscosity across all cultivars ranging from 78.99 RVU (Impilo) to 319.26 (Dagga). Peak time viscosity varied significantly across all cultivars ranging from 3.87 min (Impilo) to 8.47 min. (Bophelo). Dagga cultivar had significantly the highest pasting temperature (94.16oC) and Bophelo the lowest (77.75oC). The setback viscosity was significantly highest 51.10 RVU (Mvuvhelo) and lowest 23.01 RVU (Impilo). All cultivars from the two locations consistently showed high potassium content ranging from 0.46% (Impilo) to 1.38% (Dagga) as compared to other minerals such as magnesium, calcium and chlorine which ranged from 0.16% (Impilo) to 0.34%. (Dagga). The CT scans revealed that there was a possibility of evaluating the effect of location on the density of granules of sweet potato flour and also the inherent differences in granular distribution of various sweet potato cultivars. SEM revealed high amounts of potassium, magnesium and chlorine. A profile of physicochemical and functional properties of flour of some of the OFSP cultivars produced in Limpopo province, South Africa has been drawn. This study also highlights the nutritional quality of the flour from four sweet potato cultivars and provides a ranking of flour to help the producers in the selection process. Bophelo flour was ranked the highest in terms of β- and, α-carotenes, total carotenoids and antioxidant capacity while Impilo was ranked highest in terms of functional properties and ash content. This study has highlighted significant differences in a number of parameters measured among the sweet potato cultivars. Therefore, in order to derive the maximum benefit from a given cultivar careful selection of sweet potato cultivars would be necessary.