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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Interplanting of a deficient soybean stand

Troesser, Steven J. January 2008 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 18, 2008) Includes bibliographical references.
2

The influence of storage environments on soybean (Glycine max (L.) Merrill) seed quality /

Vantoai, Tara T. January 1982 (has links)
No description available.
3

Vigor de sementes, população de plantas e desempenho agrônomico de soja /

Rossi, Rubiana Falopa, 1986. January 2012 (has links)
Orientador: Cláudio Cavariani / Banca: José de Barros França Neto / Banca: Leila Martins / Resumo: A cultura da soja, em razão de sua importância no agronegócio mundial, é alvo de inúmeras pesquisas no campo fitotécnico na busca por novas informações para elevação da produtividade. O vigor é um dos principais atributos da qualidade fisiológica das sementes a ser considerado na implantação de uma lavoura, pela influência que pode ter no crescimento e no rendimento das plantas. A pesquisa teve como objetivo avaliar o desempenho de plantas de soja e a qualidade das sementes produzidas em diferentes densidades populacionais, em função do nível de vigor das sementes utilizadas. O experimento foi conduzido em duas etapas. A primeira constituiu da fase de campo, mediante delineamento em bloco ao acaso, com quatro repetições, em esquema fatorial 3x3 (densidades populacionais de 7, 12 e 17 pl.m-1 e níveis de vigor das sementes alto, médio e baixo), empregando-se três cultivares de soja. Foram avaliados a população inicial, a data do florescimento, o ciclo, a altura média das plantas e da inserção da primeira vagem, os números médio de vagens por planta e de sementes por vagem, a população final de plantas, em relação à inicial, e a produção de sementes. A segunda etapa foi realizada no laboratório e constou da avaliação das características qualitativas das sementes de soja produzidas na etapa anterior. Foi evidente o efeito do vigor das sementes na emergência de plântulas em campo, sendo superior quando oriundas das sementes de alto vigor. A elevação da densidade de plantas de soja na linha ressalta, positivamente, efeitos dos níveis de vigor no desenvolvimento das plantas. O vigor das sementes e a densidade de plantas na linha têm influencia na produção de soja; elevações de 8% e 6% na produção foram observadas em plantas originadas de sementes com vigor médio e alto, em relação às... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Due to the importance of soybean in the world agribusiness, this crop has been the subject of innumerous research studies, looking for management techniques to increase production per area. The vigor is one of the main seed physiological quality characters that has to be considered in the crop establishment, because it can influence the plant growth and final production. This study aimed to evaluate the performance of soybean plants and the quality of seeds produced in different population densities, depending on the level of vigor of the seed sown. The experiment was conducted in two stages. The first one was conducted at the field, in randomized block design, with four replications, in a factorial 3x3 design (densities of 7, 12 and 17 pl.m-1 and levels of seed vigor, high, medium and low), using three soybean cultivars. The following parameters were: initial population, flowering cycle, average height of plants and first pod; average number of pods per plant and seeds per pod; final population of plants (in relation to the initial population); and seed yield. In the second stage, conducted in the laboratory, the quality of the produced seed was evaluated. The effect of seed vigor on seedling emergence in the field was evident, being higher when derived from the seeds of high vigor. The high density of soybean plants in the row highlights positively the effects of vigor levels upon plants development. Seed vigor and plant density on the line have influence on soybean production; increases of 8% and 6% in seed yield were observed in plants from seeds with medium and high vigor, compared to those coming from low vigor. Seed vigor and plant density on the line do not affect the physiological quality of the produced seeds / Mestre
4

Vigor de sementes, população de plantas e desempenho agrônomico de soja

Rossi, Rubiana Falopa [UNESP] 01 March 2012 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:22:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-03-01Bitstream added on 2014-06-13T18:48:45Z : No. of bitstreams: 1 rossi_rf_me_botfca.pdf: 365226 bytes, checksum: 61d4bb5c47783421434379c08c1d49bb (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / A cultura da soja, em razão de sua importância no agronegócio mundial, é alvo de inúmeras pesquisas no campo fitotécnico na busca por novas informações para elevação da produtividade. O vigor é um dos principais atributos da qualidade fisiológica das sementes a ser considerado na implantação de uma lavoura, pela influência que pode ter no crescimento e no rendimento das plantas. A pesquisa teve como objetivo avaliar o desempenho de plantas de soja e a qualidade das sementes produzidas em diferentes densidades populacionais, em função do nível de vigor das sementes utilizadas. O experimento foi conduzido em duas etapas. A primeira constituiu da fase de campo, mediante delineamento em bloco ao acaso, com quatro repetições, em esquema fatorial 3x3 (densidades populacionais de 7, 12 e 17 pl.m-1 e níveis de vigor das sementes alto, médio e baixo), empregando-se três cultivares de soja. Foram avaliados a população inicial, a data do florescimento, o ciclo, a altura média das plantas e da inserção da primeira vagem, os números médio de vagens por planta e de sementes por vagem, a população final de plantas, em relação à inicial, e a produção de sementes. A segunda etapa foi realizada no laboratório e constou da avaliação das características qualitativas das sementes de soja produzidas na etapa anterior. Foi evidente o efeito do vigor das sementes na emergência de plântulas em campo, sendo superior quando oriundas das sementes de alto vigor. A elevação da densidade de plantas de soja na linha ressalta, positivamente, efeitos dos níveis de vigor no desenvolvimento das plantas. O vigor das sementes e a densidade de plantas na linha têm influencia na produção de soja; elevações de 8% e 6% na produção foram observadas em plantas originadas de sementes com vigor médio e alto, em relação às... / Due to the importance of soybean in the world agribusiness, this crop has been the subject of innumerous research studies, looking for management techniques to increase production per area. The vigor is one of the main seed physiological quality characters that has to be considered in the crop establishment, because it can influence the plant growth and final production. This study aimed to evaluate the performance of soybean plants and the quality of seeds produced in different population densities, depending on the level of vigor of the seed sown. The experiment was conducted in two stages. The first one was conducted at the field, in randomized block design, with four replications, in a factorial 3x3 design (densities of 7, 12 and 17 pl.m-1 and levels of seed vigor, high, medium and low), using three soybean cultivars. The following parameters were: initial population, flowering cycle, average height of plants and first pod; average number of pods per plant and seeds per pod; final population of plants (in relation to the initial population); and seed yield. In the second stage, conducted in the laboratory, the quality of the produced seed was evaluated. The effect of seed vigor on seedling emergence in the field was evident, being higher when derived from the seeds of high vigor. The high density of soybean plants in the row highlights positively the effects of vigor levels upon plants development. Seed vigor and plant density on the line have influence on soybean production; increases of 8% and 6% in seed yield were observed in plants from seeds with medium and high vigor, compared to those coming from low vigor. Seed vigor and plant density on the line do not affect the physiological quality of the produced seeds
5

Effect of common seed, soil and storage pathogens on soybean seed quality testing /

Gupta, Indra Jeet January 1984 (has links)
No description available.
6

Identification and Localization of Quantitative Trait Loci (QTL) and Genes Associated with Oil Concentration in Soybean [Glycine max (L.) Merrill] Seed

Eskandari, Mehrzad 13 December 2012 (has links)
Soybean [Glycine max (L.) Merr.] seed is a major source of edible oil in the world and the main renewable raw material for biodiesel production in North America. Oil, which on average accounts for 20% of the soybean seed weight, is a complex quantitative trait controlled by many genes with mostly minor effects and influenced by environmental conditions. Because of its quantitative nature, the seed oil concentration may have an indirect effect on other economically important and agronomic traits such as seed yield and protein concentration. Increasing the oil concentration in soybean has been given more attention in recent years due to increasing demand for both edible oil and feedstock. To achieve this objective, it is important to understand the genetic control of the oil accumulation and its relationship with other traits. The main objectives of this thesis were to identify quantitative trait loci (QTL) and genes involved in oil biosynthesis in soybean. Two recombinant inbred line (RIL) populations were developed from crosses between moderately high oil soybean cultivars with high seed yield and protein concentration. In a population of 203 F3:6 RILs from a cross of ‘OAC Wallace’ and ‘OAC Glencoe’, a total of 11 genomic regions located on nine different chromosomes were identified as associated with oil concentration using multiple QTL mapping (MQM) and single-factor ANOVA. Among the 11 oil-associated QTL, four QTL were also validated in a population of 211 F3:5 RILs from a cross of ‘RCAT Angora’ and ‘OAC Wallace’. There were six oil QTL identified in this study that were co-localized with seed protein QTL and four for seed yield QTL. The oil-beneficial allele of the QTL tagged by marker Sat_020, on Chromosome 9, was positively associated with seed protein concentration. The oil-enhancing alleles at markers Satt001 and GmDGAT2B were positively correlated with seed yield. In this study, three sequence mutations were also discovered in either the coding or non-coding regions of three DGAT soybean genes (GmDGAT2B, GmDGAT2C, and GmDGAT1B) between ‘OAC Wallace’ and ‘OAC Glencoe’ that showed significant effects on some of the traits evaluated. GmDGAT2B showed significant association with seed oil and yield across different environments. The oil-favorable allele of the gene GmDGAT2B from ‘OAC Glencoe’ was also positively correlated with seed yield. GmDGAT2C was associated with seed yield, whereas GmDGAT1B showed significant effects on seed yield and protein concentration. However, neither of these two genes showed any association with seed oil. The yield-enhancing allele of GmDGAT1B showed negative association with protein concentration. The identification of oil QTL that were either positively associated with seed yield and protein or neutral to both traits and the development of new gene-based markers will facilitate marker-assisted breeding to develop high oil soybean cultivars with high yield and minimal effect on protein concentration. / Generous funding to conduct this research was provided by the Alternative Renewable Fuels II Program of the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) and by the Grain Farmers of Ontario.
7

Detecção e identificação de Diaporthe phaseolorum var. meridionalis em sementes de soja por PCR

Vechiato, Marta Helena [UNESP] 09 1900 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:35:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-09Bitstream added on 2014-06-13T19:24:08Z : No. of bitstreams: 1 vechiato_mh_dr_botfca.pdf: 1951086 bytes, checksum: 3601f634d2920c34d704cb5312055b13 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / O presente trabalho teve como objetivos a) desenvolver um método eficiente, rápido e de fácil aplicação na detecção e na identificação de Diaporthe phaseolorum var. meridionalis (Dphm), em sementes de soja utilizando-se a técnica de reação de polimerase em cadeia (PCR); b) comparar PCR com os métodos rotineiros de patologia de sementes. Os resultados sugerem que pode haver uma identificação equivocada, quando se utiliza este parâmetro na diferenciação do agente causal do cancro da haste da soja, com outras espécies de Diaporthe presentes em sementes; b) pela coloração das colônias nos meios de cultura BDA e Czapeck, os isolados de Dphm e Dph foram agrupados em 9 classes. Em meio Czapeck, todas as colônias identificadas como Dphm, foram agrupadas nas classes 8 e 9, apresentando um padrão micelial lanoso (tipo feltro), exceto o isolado 46; c) pelo crescimento micelial não foi possível distinguir Dphm de Dph. Comparando-se os métodos do papel de filtro modificado com 2,4D, plaqueamento em BDA e sementes em papel de filtro com 2,4D, associado a PCR, para detecção e identificação de Dphm, visando distinguí-lo de outras espécies presentes nas sementes, conclui-se que o método mais confiável foi o de incubação das sementes em papel de filtro com 2,4D associado a PCR. Em relação ao melhor método de extração de DNA, em sementes colonizadas por Dph., foi o da lavagem das sementes com STE e purificação do DNA com a resina de sílica gel da Wizard (Promega). / The objective of this research was to develop, an easy, quick and efficient method for detection and identification of Diaporthe phaseolorum var. meridionalis (Dphm), in soybean seeds, using the polimerase chain reaction (PCR) technique and methods routinely used in seed pathology. The results suggest that there can be a mistake when using this parameter to distinguish the causal agent of the stem canker from other species of Diaporthe; b)color of the colonies in PDA and Czapeck medium, Dphm and the of Diaporthe spp. (Dph) isolates were grouped in 9 classes. In Czapeck medium, all isolates identified as Dphm, were grouped in classes 8 and 9, showing wooled micelial pattern (like felt), except isolate 46; c) basead on the micelial growth it was not possible to distinguish Dphm from Dph. For detection and identification of Dphm of other Dph species in the seeds, the most reliable method was the modified blotter test with 2,4D associated with PCR. In Dph colonized seeds, the best method of DNA extraction was seed washing with STE and DNA purification using Wizard (Promega) silica gel resin.
8

Detecção e identificação de Diaporthe phaseolorum var. meridionalis em sementes de soja por PCR /

Vechiato, Marta Helena, 1953- January 2002 (has links)
Resumo: O presente trabalho teve como objetivos a) desenvolver um método eficiente, rápido e de fácil aplicação na detecção e na identificação de Diaporthe phaseolorum var. meridionalis (Dphm), em sementes de soja utilizando-se a técnica de reação de polimerase em cadeia (PCR); b) comparar PCR com os métodos rotineiros de patologia de sementes. Os resultados sugerem que pode haver uma identificação equivocada, quando se utiliza este parâmetro na diferenciação do agente causal do cancro da haste da soja, com outras espécies de Diaporthe presentes em sementes; b) pela coloração das colônias nos meios de cultura BDA e Czapeck, os isolados de Dphm e Dph foram agrupados em 9 classes. Em meio Czapeck, todas as colônias identificadas como Dphm, foram agrupadas nas classes 8 e 9, apresentando um padrão micelial lanoso (tipo feltro), exceto o isolado 46; c) pelo crescimento micelial não foi possível distinguir Dphm de Dph. Comparando-se os métodos do papel de filtro modificado com 2,4D, plaqueamento em BDA e sementes em papel de filtro com 2,4D, associado a PCR, para detecção e identificação de Dphm, visando distinguí-lo de outras espécies presentes nas sementes, conclui-se que o método mais confiável foi o de incubação das sementes em papel de filtro com 2,4D associado a PCR. Em relação ao melhor método de extração de DNA, em sementes colonizadas por Dph., foi o da lavagem das sementes com STE e purificação do DNA com a resina de sílica gel da Wizard (Promega). / Abstract: The objective of this research was to develop, an easy, quick and efficient method for detection and identification of Diaporthe phaseolorum var. meridionalis (Dphm), in soybean seeds, using the polimerase chain reaction (PCR) technique and methods routinely used in seed pathology. The results suggest that there can be a mistake when using this parameter to distinguish the causal agent of the stem canker from other species of Diaporthe; b)color of the colonies in PDA and Czapeck medium, Dphm and the of Diaporthe spp. (Dph) isolates were grouped in 9 classes. In Czapeck medium, all isolates identified as Dphm, were grouped in classes 8 and 9, showing wooled micelial pattern (like felt), except isolate 46; c) basead on the micelial growth it was not possible to distinguish Dphm from Dph. For detection and identification of Dphm of other Dph species in the seeds, the most reliable method was the modified blotter test with 2,4D associated with PCR. In Dph colonized seeds, the best method of DNA extraction was seed washing with STE and DNA purification using Wizard (Promega) silica gel resin. / Orientador: Antonio Carlos Maringoni / Coorientador: Elza Maria Frias Martins / Doutor
9

An ultrastructural study of the symbiotic relationships of four strains of Bradyrhizobium japonicum with glycine max /

Huber, Mary Christine, January 1997 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 456-600). Also available on the Internet.
10

An ultrastructural study of the symbiotic relationships of four strains of Bradyrhizobium japonicum with glycine max

Huber, Mary Christine, January 1997 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 456-600). Also available on the Internet.

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