Ethylene plays a key role in square and boll abscission in cotton (Gossypium hirsutum L.). When subjected to stress, cotton plants synthesize higher rates of ethylene which can result in the loss of immature fruit. The ethylene action inhibitor 1- methylcyclopropene (1-MCP) is used in many fruit, vegetable, and floriculture crops to counter the effects of ethylene. Protecting a cotton crop from ethylene through its early reproductive stages may boost yields by increasing fruit retention. A two-year field study was conducted in 2005 and 2006 at the Texas Agricultural Experiment Station in Burleson County, Texas to evaluate the effects of 1-MCP concentration and timing on cotton growth and yield components. The study was designed as a randomized complete block with 4 replications. Three rates of 1-MCP (250, 500, and 1250 g ha-1 of actual product) were applied as a foliar spray at a delivery rate of 93.50 L -1 ha. Each rate was applied at pinhead-square and fourteen days after pinhead-square; pinhead-square, fourteen days after pinheadsquare, and early bloom; early bloom and fourteen days after early bloom; early bloom, fourteen days after early bloom, and twenty-eight days after early bloom. Plant heights, total number of nodes per plant, percent square abscission, nodes above white flower (NAWF), relative chlorophyll content, fruit number, fruit size, and fruit distribution were not affected by 1-MCP. In 2006, electrolytic leakage was significantly increased by two, 250 g ha-1, 1-MCP treatments. In 2005, yield was significantly increased by six of the 1- MCP treatments and suggests an increase in boll retention, boll size, seed number, or seed size. The analysis of yield components conducted through box-mapping, however, failed to explain the observed yield response. In 2006, 1-MCP did not significantly influence yield.

Many environmental stress factors have been identified that increase square and boll abscission and thus result in reduced cotton (Gossypium hirsutum L.) yield. Under stress conditions, ethylene, an endogenous hormone, is elicited. Ethylene peaks before abscission to promote the formation of the abscission layer and plays a major role in early season square and boll abortion. In addition, ethylene stimulates the leaf senescence process. Thus, it is desirable to protect a crop from ethylene-induced fruit loss and premature leaf senescence under stress conditions. The overall objective of this study was to test the hypothesis that the ethylene inhibiting compound 1-methylcyclopropene (1-MCP) treatment can have a beneficial effect on the physiology, biochemistry and yield traits of cotton plants under abiotic stress conditions under field and controlled environment studies. The growth chamber studies were conducted in 2011 using a randomized complete design with six replications. Cotton plants were exposed to stress conditions (heat and drought) and 1-MCP treatment at the seven-true-leaf stage. The heat stress study consisted of two 1-MCP rates (0 and 10 g a.i. ha-1) and two temperature regimes (optimum temperature: 30/20 ºC (day/night temperature) and high temperature: 40/25 ºC). The drought study consisted of two water regimes (well-watered and water-stressed) was exposed to two rates of 1-MCP (0 and 10 g a.i. ha-1). Both of the field studies were conducted with a randomized complete block design with four replications in 2010 and 2011 at the Texas A&M AgriLIFE Research Farm in Burleson County, TX. The objective of the first field study was to evaluate the ability of 1-MCP to protect cotton plants against abiotic stress imposed by a foliar treatment of ethephon. Eight treatments consisted of two 1-MCP rates (0 and 10 g a.i. ha-1) in combination of four ethephon rates (0, 146, 292, and 438 mL ha-1) were imposed at the first flower (FF) stage of crop development. The second field study investigated the effect of 1-MCP on boll development and the corresponding subtending leaves, and consisted of two 1-MCP rates (0 and 10 g a.i. ha-1) applied at 20 days after flowering. In the growth chamber study examining heat and drought, application of 1-MCP resulted in reductions of lipid peroxidation, membrane leakage, and soluble sugar content as well as increased chlorophyll content, compared to the untreated plants under stress conditions. In the field study to evaluate the effect of 1-MCP under ethephon stress, 1-MCP increased plant height and number of main stem nodes in both years. In addition, 1-MCP treated plants exhibited greater membrane integrity and increased photosystem II quantum efficiency, and thus delayed senescence in both years. This potential for yield increase was realized in 2011 with 1-MCP treatment exhibiting a higher lint yield. In 2012, although 1-MCP treatment increased number of open fruit and open fruit weight per plant, no significant yield increase was detected. In the field study to test the effect of 1-MCP on boll development and subtending leaf conditions, 1-MCP treatment increased cotton boll weight at 20 days after flowering. One probable explanation for the enhanced boll size was the healthier subtending leaves: 1-MCP-treated subtending leaves exhibited decreased membrane damage and lipid peroxidation, and higher chlorophyll content and photosynthetic efficiency.

Abiotic stresses impact cotton (Gossypium hirsutum L.) affecting physiological, molecular, morphological, and agronomic parameters. One of the main yield components in cotton production is the number of bolls per unit area. However, boll abortion is increased when cotton experiences various stresses during its reproductive development that can consequently reduce lint yield. Prior to abscission, a burst in ethylene is observed which may be assumed to be the signal necessary to initiate abscission of that particular structure. It is desirable to prevent fruit loss that may be induced by the peak in ethylene prior to abscission. One potential option to cope with the loss of cotton reproductive structures is the use of ethylene inhibitors. The overall objective of this research was to establish if 1-MCP would synergize, ameliorate, or overcome the effects of abiotic stresses on physiological, molecular, morphological, and agronomic parameters of cotton plants under abiotic stress conditions in field and greenhouse studies. Field and greenhouse experiments were conducted from 2007 to 2009 as a randomized complete block design with four replications in the field, and as a 2x2 factorial design in a split-block arrangement with five replications in the greenhouse. Field treatments consisted of three rates of 1-MCP (0, 25 and 50 g a.i. ha-1) in combination with a surfactant applied at mid-bloom. One day later, ethephon (synthetic ethylene) was applied as a source of abiotic stress. Greenhouse treatments were two 1-MCP rates (0 and 2.4 g a.i. L-1) during a14-h overnight incubation that were then subjected to two water regimes (control and stressed) as the source of stress. Greenhouse assessments with gas exchange analysis revealed that water deficit stress started to impact plants at a moderate water stress, 5 days after 1-MCP treatment (DAT) and a water potential (ψw) of -1.4 MPa. The 1-MCP increased water use efficiency in well-watered plants at 1 DAT. Many of the yield components, plant mapping, and biomass parameters investigated were detrimentally affected by drought. However, drought increased specific leaf weight, chlorophyll content, and harvest index. The 1- MCP improved reproductive node numbers mainly during drought, but did not lead to a better harvest index, since 1-MCP caused high abscission. Ethylene synthesis and molecular investigations in greenhouse conditions showed that at 1, 5, 7, 9, 11, and 13 DAT, ethylene production of stressed plants never exceeded those of control plants. As the ψw became more negative ethylene production rate was reduced among stressed plants independent of 1-MCP treatments. However, at 1 DAT 1-MCP caused a transient climacteric stage (ethylene synthesis increase) in leaves. The two primary genes associated with ethylene synthesis, ACS6 (1-aminocyclopropane-1-carboxylic acid synthase) and ACO2 (1-aminocyclopropane-1-carboxylic acid oxidase) expression generally showed an identical trend that supported the ethylene synthesis data. The 1-MCP did not ameliorate any of the detrimental effects of water stress on gas exchange at the point where it started to impact cotton plants. 1-MCP had little or no positive effect on plant mapping, dry matter partitioning and chlorophyll content. Field investigations revealed that at harvest, fruit set in the upper portion of the canopy was influenced by 1- MCP. This portion of the canopy had a greater number of full size, yet immature bolls, which potentially could have had a positive influence on the lint yield. However, ethephon caused the highest lint yield since ethephon treated plants had more open bolls and total bolls in the lower canopy at harvest.

The aim of the thesis on the Effect of 1-MCP on the extension of the shelf-life of peach and plum fruits was to determine the effect of 1-MCP on the peach fruits of the 'Redhaven' variety and plum fruits of the 'TOP' variety. The practical part consisted of harvesting the fruits of harvest maturity, an analysis of quality parameters (weight, firmness, sensory evaluation, titratable acid, soluble solids, ethylene production, respiration), 1-MCP treatment and storage at 2 °C and 20°C. After 7 and 14 days (10 days in the case of peaches stored at 20 °C) the quality parameters of all fruits were determined. Using the measured values, the effect of 1-MCP on various parameters influencing the prolongation of life was considered for treated and control fruits. The theoretical part dealt with different fruit species and varieties, material components important for fruit ripening, ethylene, 1-MCP and storage of fruit.

Submitted by GIOVANNA ALENCAR LUNDGREN null (giolundgren@gmail.com) on 2017-04-03T13:32:35Z No. of bitstreams: 1 GIOVANNA LUNDGREN - DISSERTAÇÃO.pdf: 3870598 bytes, checksum: 7581ab6f530188ee4e1822bbc2367d32 (MD5) / Rejected by Luiz Galeffi (luizgaleffi@gmail.com), reason: Solicitamos que realize uma nova submissão seguindo as orientações abaixo: No campo “Versão a ser disponibilizada online imediatamente” foi informado que seria disponibilizado o texto completo porém no campo “Data para a disponibilização do texto completo” foi informado que o texto completo deverá ser disponibilizado apenas 6 meses após a defesa. Caso opte pela disponibilização do texto completo apenas 6 meses após a defesa selecione no campo “Versão a ser disponibilizada online imediatamente” a opção “Texto parcial”. Esta opção é utilizada caso você tenha planos de publicar seu trabalho em periódicos científicos ou em formato de livro, por exemplo e fará com que apenas as páginas pré-textuais, introdução, considerações e referências sejam disponibilizadas. Se optar por disponibilizar o texto completo de seu trabalho imediatamente selecione no campo “Data para a disponibilização do texto completo” a opção “Não se aplica (texto completo)”. Isso fará com que seu trabalho seja disponibilizado na íntegra no Repositório Institucional UNESP. Por favor, corrija esta informação realizando uma nova submissão. Agradecemos a compreensão. on 2017-04-11T19:44:38Z (GMT) / Submitted by GIOVANNA ALENCAR LUNDGREN null (giolundgren@gmail.com) on 2017-04-11T19:50:15Z No. of bitstreams: 1 GIOVANNA LUNDGREN - DISSERTAÇÃO.pdf: 3870598 bytes, checksum: 7581ab6f530188ee4e1822bbc2367d32 (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-11T20:00:37Z (GMT) No. of bitstreams: 1 lundgren_ga_me_bot.pdf: 3870598 bytes, checksum: 7581ab6f530188ee4e1822bbc2367d32 (MD5) / Made available in DSpace on 2017-04-11T20:00:37Z (GMT). No. of bitstreams: 1 lundgren_ga_me_bot.pdf: 3870598 bytes, checksum: 7581ab6f530188ee4e1822bbc2367d32 (MD5) Previous issue date: 2017-02-21 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A atemoia é um fruto climatérico altamente perecível, e para sua comercialização é necessário que se faça uso de métodos de conservação pós colheita. O presente trabalho teve como objetivo a conservação da Atemoia com a utilização de 1-metilciclopropeno (1-MCP). Os frutos após a colheita foram selecionados e submetidos a diferentes concentrações de 1-MCP (200 µL.L-1, 300 µL.L-1 e 400 µL.L-1) e após o procedimento foram armazenados sob refrigeração em câmara fria a 15ºC±1 e 90±5% de UR. Foram avaliados pH, acidez titulável (AT), sólidos solúveis (SS), índice de maturação, perda de massa fresca, atividade respiratória, açúcares redutores, amido, coloração, ácido ascórbico, compostos fenólicos totais, capacidade antioxidante, atividade das enzimas polifenoloxidase (PFO), peroxidase (POD), poligalacturonase (PG) e pectinametilesterase (PME), análise visual e sensorial. As análises foram realizadas nos frutos em triplicata a cada 3 dias, durante 18 dias. O delineamento utilizado foi inteiramente casualizado em esquema fatorial (4x7), com 3 repetições por tratamento. O uso de 1-metilciclopropeno na maior dose, de 400 µL.L-1 juntamente com o armazenamento refrigerado é recomendado para conservação e aumento da vida de prateleira. / The atemoya is a highly perishable climacteric fruit, and marketing is necessary to make use of post harvest conservation methods. This work aimed at the conservation of atemóia with the use of 1-methylcyclopropene (1-MCP). The fruits after harvest were selected and subjected to different concentrations of 1-MCP (200 ppm, 300 ppm and 400 ppm) and after the procedure were stored under refrigeration in cold storage at 15 ° C ± 1 and 90 ± 5% RH. pH were evaluated, titratable acidity (TA), soluble solids (SS), maturation index, loss of weight, respiratory activity, reducing sugars, starch, coloring, ascorbic acid, total phenolic compounds, antioxidant capacity determined by DPPH, activity enzyme polyphenol oxidase (PPO), peroxidase (POD), polygalacturonase (PG) and pectin methyl esterase (PME), visual and sensory analysis. The analyzes were performed in triplicate in fruits every 3 days for 18 days. The design was completely randomized with three replicates per treatment. The use of 1-methylcyclopropene at all doses along with the refrigerated refrigerator is recommended for shelf life and shelf life.

Made available in DSpace on 2017-07-25T19:29:49Z (GMT). No. of bitstreams: 1 Mariane Gioppo.pdf: 821436 bytes, checksum: 204d771f1b0682a5eea2b7572d107f34 (MD5) Previous issue date: 2011-07-04 / The vegetables are highly perishable and their post-harvest storage is relatively short. The increased lifetime in a day or more is very important for the marketing of vegetables. An alternative to reducing losses and better use the harvest is the minimal processing, it combines convenience and practicality to be a product ready for consumption. However, some problems hindering the extension of shelf life of products such as high respiratory rate and proliferation of microorganisms. The use of growth regulators like 1-methylcyclopropene (1-MCP), an antagonist of ethylene action, and the use of plastic films have been widely studied in association with the use of low temperatures. For this study three experiments were made in order to verify the efficiency of use of 1-MCP and promalina in reducing the senescence of broccoli inflorescences, evaluate the performance of minimally processed cabbage and packed in four kinds of packaging and efficiency of 1-MCP and storage in three packaging minimally processed lettuce. Inflorescences of broccoli cultivar Avenger were sanitized, treated with 2.5 ppm 1-MCP, 50 ppm promalina, combination of 50 ppm and 2.5 ppm promalina of 1-MCP and stored in polyethylene film bags of low density (LDPE) for storage at 5 ± 2 ° C cold room. Heads of cabbage cultivar Red Dynasty were minimally processed, sanitized and packed in polyethylene terephthalate (PET) with lid, polystyrene trays (EPS) of flexible film coated with polyvinyl chloride (PVC), LDPE film and polypropylene film (PP) punched, and stored at 5 ± 2 ° C cold room. Heads of lettuce cultivar Vanda were minimally processed, sanitized, treated with 1-MCP and stored in PET bottles with lids, trays EPS coated flexible film of PVC and LDPE film, and stored at 4 ± 2 º C in cold . Treatment with MCP-1 contributed to the longevity of broccoli inflorescences up to twenty-seven days at a temperature of 5 ± 2 º C. Treatment with the combination of promalina with 1-MCP were not favorable. Regardless of the type of packaging minimally processed cabbage should not exceed four days, because I had blackened appearance due to oxidation. The PET was efficient associated with 1-MCP providing better quality for up to twelve days. / As hortaliças possuem alta perecibilidade pós-colheita e seu armazenamento é relativamente curto. O aumento da vida útil em um ou mais dias é muito importante para a comercialização das hortaliças. Uma alternativa para a redução de perdas e melhor utilização da colheita é o processamento mínimo, pois alia conveniência e praticidade por ser um produto pronto para o consumo. Entretanto, alguns problemas dificultam a extensão da vida de prateleira desses produtos, tais como alta taxa respiratória e proliferação de microrganismos. O uso de fitorreguladores como o 1-metilciclopropeno (1-MCP), um antagonista de ação do etileno, e a utilização de filmes plásticos têm sido amplamente estudados em associação com o uso de baixas temperaturas. Para a realização deste estudo foram feitos três experimentos com o objetivo de verificar a eficiência do uso do 1-MCP e da promalina na redução da senescência de inflorescências de brócolis, avaliar o comportamento do repolho roxo minimamente processado e embalado em quatro tipos de embalagem e a eficiência do 1-MCP e de três embalagens no armazenamento de alface minimamente processada. Inflorescências de brócolis da cultivar Avenger foram sanitizadas, tratadas com 2,5 ppm de 1-MCP, 50 ppm de promalina, combinação de 50 ppm de promalina e 2,5 ppm de 1-MCP e acondicionados em sacos de filme de polietileno de baixa densidade (PEBD) para armazenamento a 5±2ºC em câmara fria. Cabeças de repolho roxo da cultivar Red Dynasty foram minimamente processadas, sanitizadas e acondicionadas em embalagens de tereftalato de polietileno (PET) com tampa, bandejas de poliestireno expandido (EPS) revestidas com filme flexível de policloreto de vinila (PVC), filme de PEBD e filme de polipropileno (PP) perfurado, e armazenadas a 5±2ºC em câmara fria. Cabeças de alface crespa da cultivar Vanda foram minimamente processadas, sanitizadas, tratadas com 1-MCP e acondicionadas em embalagens de PET com tampa, bandejas de EPS revestidas com filme flexível de PVC e filme de PEBD, e armazenadas a 4±2ºC em câmara fria. O tratamento com 1-MCP contribuiu na longevidade das inflorescências do brócolis por até vinte e sete dias à temperatura de 5±2ºC. Os tratamentos com promalina e a combinação deste com o 1-MCP não se mostraram favoráveis. Independente do tipo de embalagem o repolho roxo minimamente processado não deve ultrapassar quatro dias, pois já apresentava aparência escurecida devido à oxidação. A embalagem PET mostrou-se eficiente associada ao 1-MCP proporcionando melhor qualidade por até doze dias.

O aroma de frutos é um atributo fortemente associado à qualidade, e quaisquer alterações ambientais ou tratamentos pós-colheita podem alterar a sua composição. Acredita-se que a biossíntese de voláteis seja um dos processos regulados pelo etileno. Estudos indicam que a expressão diferencial dos elementos que compõem os receptores de etileno desempenha importante papel na sinalização dos processos ligados ao amadurecimento, entre eles a formação do aroma. Os objetivos deste trabalho são: caracterizar as alterações decorrentes de tratamentos pós-colheita no aroma de banana durante o amadurecimento, e correlacionar com as variações nos padrões de expressão gênica diferencial dos receptores de etileno. Bananas pré-climatéricas variedade Nanicão foram divididas em quatro grupos: controle (não tratado), etileno (100ppm/12h), 1-MCP (100ppb/12h), armazenados a 20°C, e grupo frio (armazenado por 15 dias a 13°C). Foram analisados diariamente a produção de etileno e de CO2 por CG. Foram analisadas a cor da casca, açúcares solúveis e amido. Os compostos voláteis foram isolados por microextração em fase sólida (SPME) em frutos inteiros e polpas e analisados em CG-MS. Para confirmar os resultados e verificar se as alterações encontradas se repetem em outras variedades de bananas, o estudo foi repetido no Horticultural Sciences Department, na Universidade da Florida (EUA), em bananas var. \'Grand Naine\'. Em paralelo, realizou-se a quantificação relativa da expressão dos receptores de etileno (ETR1, ERS1, ERS2 e ERS3) por PCR em tempo real. Com relação ao perfil de voláteis, os resultados indicam que os frutos não se diferenciam no período pré-climatérico. Porém, o perfil de voláteis do grupo controle foi significativamente diferente do grupo frio, tanto na polpa quanto no fruto inteiro no período climatérico. Esse efeito foi mais pronunciado na Nanicão do que na \'Grand Naine\'. Compostos típicos como o acetato de isoamila foram drasticamente reduzidos nos frutos submetidos ao frio, e não foram encontrados na Nanicão. Não houve diferenças significativas com relação ao perfil de aromas entre o grupo controle e o grupo etileno. Com relação aos frutos tratados com 1-MCP observou-se o atraso na formação de alguns compostos sem alterar, contudo, o perfil final de voláteis. Com relação ao padrão de transcrição dos receptores de etileno, o frio reduziu o acúmulo dos transcritos do ETR1, ERS2 e ERS3 em todos os pontos. ERS1 parece estar correlacionado com a síntese de esteres. Os resultados sugerem que o mecanismo pelo qual o etileno regula o metabolismo de biossíntese de aromas parece contar com a participação relevante de determinados tipos de receptores. A correlação temporal encontrada entre as alterações no perfil de transcritos de três destes e os efeitos sobre a produção de compostos voláteis reforçam esta hipótese. / Fruit aroma is an attribute strongly associated to quality, and any change in the environment or post-harvest treatment could affect its composition. Volatile biosynthesis is a process that is believed to be regulated by ethylene. Studies demonstrate that differential expression of ethylene receptors have an important role in fruit ripening processes, including aroma synthesis. The aims of this study are: evaluate modifications due to post-harvest treatment on the aroma of banana fruit during ripening, and correlate to variations on differential expression of ethylene receptors. Pre climacteric bananas of \'Nanicão\' variety were divides in four groups: control (without treatment), ethylene (100ppm/12h), 1-MCP (100ppb/12h), stored at 20°C, and cold storage group (stored for 15 days at 13°C). Daily measurements were conducted of ethylene production and respiration using GC. Peel color, soluble sugars and starch were analyzed. Volatile compounds were isolated by solid phase microextraction (SPME) in whole fruits and pulp and analyzed by GCMS. To confirm the results ant to verify if the findings repeat in another banana variety, this study was repeated at Horticultural Sciences Department, at University of Florida (EUA), under supervision of Dr. Jeffrey K. Brecht, in bananas Cavendish cv. \'Grand Naine\'. Also, relative quantification of the expression of ethylene receptors (ETR1, ERS1, ERS2 and ERS3) was analyzed using real time PCR. Regarding the volatile profile, groups did not differentiated in pre-climacteric period. But the volatile profile of control group significantly differentiates from cold storage group, in both pulp and whole fruit, in post climacteric period. This effect was more pronounced in bananas \'Nanicão\' than \'Grand Naine\'. Typical banana aroma compounds like isoamyl acetate were drastically reduced in fruits under cold storage, and were not found in \'Nanicão\'. There were not any significant differences between control group and ethylene treated. Regarding 1-MCP treated fruits, there was a delay on the synthesis of some compounds without affecting the final volatile profile. Regarding the transcription pattern of ethylene receptors, cold storage reduced mRNA of ETR1, ERS2 and ERS3 in all samples. ERS1 receptor seems to be correlated to ester synthesis. These results suggest that the mechanism whereby the ethylene regulates the biosynthesis of aroma, seems to count with relevant participation of some receptors. The temporal correlation found in the differential expression of three receptors and the effect on volatile compounds synthesis reinforces this hypothesis.

Made available in DSpace on 2016-08-12T19:18:36Z (GMT). No. of bitstreams: 1 Elizangela Cabral.pdf: 541832 bytes, checksum: cf3c268bd8a8a388b2298f84c4205ac3 (MD5) Previous issue date: 2008-11-19 / This work was aimed at to evaluate the effects of 1-MCP and carnauba wax on the quality and shelf life of papaya Tainung 01 (Formosa group) grown at Acaraú valley (State of Ceará, Brazil), harvested at different maturation stages, and stored under refrigeration (at the site of production: Marco, State of Ceará) and under ambient temperature (at Embrapa Agroindústria Tropical, Fortaleza, Ceará). The fruits were treated according to the destination markets. For the domestic market, the treatments were wax 18% application (control) and wax application followed by 1-MCP. For the external market, it was utilized the following applications: wax (control), 1-MCP after wax, and wax after 1-MCP. After treatment the fruits were stored in chambers at 11 ± 1ºC and 90 ± 5% RH, for six days (domestic market) and for 12 days (external market). After storage at the site of production, the fruits were transported (under refrigeration) to the facilities at Embrapa Agroindústria Tropical (about 240 km far from the site of production), where they were then stored for a further period of 14 days at 22 ± 2ºC and 60 ± 5% RH. During this period, at intervals of two days, it was evaluated the external and internal appearances, skin and pulp colors, loss of mass, external and internal firmnesses, soluble solids content, pH, titratable acidity and vitamin C content. The experiment was conducted in a completely randomized split-plot scheme with treatments assigned to the plots (for the domestic market wax and wax + 1-MCP; for the external market wax, wax + 1-MCP, and 1-MCP + wax) and time to the subplots. The application of 1-MCP extended the shelf life of the papaya Tainung 01 fruits, independently of market destination, however more efficient when applied previously to the carnauba wax. / O objetivo desse trabalho foi avaliar os efeitos de 1-MCP e cera de carnaúba sobre a qualidade e a vida útil do mamão Tainung 01 (grupo Formosa) produzido no vale do Acaraú (CE), colhido em diferentes estádios de maturação e armazenado sob refrigeração (na propriedade, Marco, CE) e temperatura ambiente (na Embrapa Agroindústria Tropical, Fortaleza, CE). Os frutos foram tratados de acordo com o mercado de destino. Para o mercado interno, os tratamentos utilizados foram aplicações de cera a 18 % (testemunha) e cera seguida de 1-MCP; já para o mercado externo, foram utilizados as seguintes aplicações: cera (testemunha), cera seguida de 1- MCP e 1-MCP seguido de cera. Em seguida, os frutos foram mantidos armazenados em câmaras a 11 ± 1ºC e 90 ± 5% UR, por seis dias (mercado interno) e por 12 dias (mercado externo). Após o armazenamento na propriedade, os frutos foram transportados, em ambiente refrigerado, para a Embrapa Agroindústria Tropical (distante cerca de 240 quilômetros do local de produção), onde foram armazenados por mais 14 dias a 22 ± 2ºC e 60 ± 5% UR. Nesse período, a cada dois dias, avaliaram-se as aparências externa e interna, as colorações da casca e da polpa, a perda de massa, as firmezas interna e externa, o teor de sólidos solúveis, o pH, a acidez titulável e o teor de vitamina C. O delineamento utilizado foi o inteiramente casualizado, em esquema de parcelas subdivididas, aplicando-se nas parcelas os tratamentos (para o mercado interno cera e cera + 1-MCP; para o mercado externo cera, cera + 1-MCP e 1-MCP + cera) e nas subparcelas, o tempo. Constatou-se que a aplicação de 1-MCP prolongou a vida útil do mamão Tainung 01 , independentemente do tipo de mercado, sendo mais eficiente quando a aplicação foi feita antes da aplicação da cera de carnaúba.

Made available in DSpace on 2016-08-12T19:18:37Z (GMT). No. of bitstreams: 1 Elizangela Cabral dos Santos.pdf: 541832 bytes, checksum: cf3c268bd8a8a388b2298f84c4205ac3 (MD5) Previous issue date: 2008-11-19 / This work was aimed at to evaluate the effects of 1-MCP and carnauba wax on the quality and shelf life of papaya Tainung 01 (Formosa group) grown at Acaraú valley (State of Ceará, Brazil), harvested at different maturation stages, and stored under refrigeration (at the site of production: Marco, State of Ceará) and under ambient temperature (at Embrapa Agroindústria Tropical, Fortaleza, Ceará). The fruits were treated according to the destination markets. For the domestic market, the treatments were wax 18% application (control) and wax application followed by 1-MCP. For the external market, it was utilized the following applications: wax (control), 1-MCP after wax, and wax after 1-MCP. After treatment the fruits were stored in chambers at 11 ± 1ºC and 90 ± 5% RH, for six days (domestic market) and for 12 days (external market). After storage at the site of production, the fruits were transported (under refrigeration) to the facilities at Embrapa Agroindústria Tropical (about 240 km far from the site of production), where they were then stored for a further period of 14 days at 22 ± 2ºC and 60 ± 5% RH. During this period, at intervals of two days, it was evaluated the external and internal appearances, skin and pulp colors, loss of mass, external and internal firmnesses, soluble solids content, pH, titratable acidity and vitamin C content. The experiment was conducted in a completely randomized split-plot scheme with treatments assigned to the plots (for the domestic market wax and wax + 1-MCP; for the external market wax, wax + 1-MCP, and 1-MCP + wax) and time to the subplots. The application of 1-MCP extended the shelf life of the papaya Tainung 01 fruits, independently of market destination, however more efficient when applied previously to the carnauba wax. / O objetivo desse trabalho foi avaliar os efeitos de 1-MCP e cera de carnaúba sobre a qualidade e a vida útil do mamão Tainung 01 (grupo Formosa) produzido no vale do Acaraú (CE), colhido em diferentes estádios de maturação e armazenado sob refrigeração (na propriedade, Marco, CE) e temperatura ambiente (na Embrapa Agroindústria Tropical, Fortaleza, CE). Os frutos foram tratados de acordo com o mercado de destino. Para o mercado interno, os tratamentos utilizados foram aplicações de cera a 18 % (testemunha) e cera seguida de 1-MCP; já para o mercado externo, foram utilizados as seguintes aplicações: cera (testemunha), cera seguida de 1- MCP e 1-MCP seguido de cera. Em seguida, os frutos foram mantidos armazenados em câmaras a 11 ± 1ºC e 90 ± 5% UR, por seis dias (mercado interno) e por 12 dias (mercado externo). Após o armazenamento na propriedade, os frutos foram transportados, em ambiente refrigerado, para a Embrapa Agroindústria Tropical (distante cerca de 240 quilômetros do local de produção), onde foram armazenados por mais 14 dias a 22 ± 2ºC e 60 ± 5% UR. Nesse período, a cada dois dias, avaliaram-se as aparências externa e interna, as colorações da casca e da polpa, a perda de massa, as firmezas interna e externa, o teor de sólidos solúveis, o pH, a acidez titulável e o teor de vitamina C. O delineamento utilizado foi o inteiramente casualizado, em esquema de parcelas subdivididas, aplicando-se nas parcelas os tratamentos (para o mercado interno cera e cera + 1-MCP; para o mercado externo cera, cera + 1-MCP e 1-MCP + cera) e nas subparcelas, o tempo. Constatou-se que a aplicação de 1-MCP prolongou a vida útil do mamão Tainung 01 , independentemente do tipo de mercado, sendo mais eficiente quando a aplicação foi feita antes da aplicação da cera de carnaúba.

Made available in DSpace on 2016-08-12T19:18:38Z (GMT). No. of bitstreams: 1 ElizangelaCS_TESE.pdf: 541837 bytes, checksum: 2a4a6d4e89fef7c8eff40d8de6f69e74 (MD5) Previous issue date: 2008-11-19 / This work was aimed at to evaluate the effects of 1-MCP and carnauba wax on the quality and shelf life of papaya Tainung 01 (Formosa group) grown at Acaraú valley (State of Ceará, Brazil), harvested at different maturation stages, and stored under refrigeration (at the site of production: Marco, State of Ceará) and under ambient temperature (at Embrapa Agroindústria Tropical, Fortaleza, Ceará). The fruits were treated according to the destination markets. For the domestic market, the treatments were wax 18% application (control) and wax application followed by 1-MCP. For the external market, it was utilized the following applications: wax (control), 1-MCP after wax, and wax after 1-MCP. After treatment the fruits were stored in chambers at 11 ± 1ºC and 90 ± 5% RH, for six days (domestic market) and for 12 days (external market). After storage at the site of production, the fruits were transported (under refrigeration) to the facilities at Embrapa Agroindústria Tropical (about 240 km far from the site of production), where they were then stored for a further period of 14 days at 22 ± 2ºC and 60 ± 5% RH. During this period, at intervals of two days, it was evaluated the external and internal appearances, skin and pulp colors, loss of mass, external and internal firmnesses, soluble solids content, pH, titratable acidity and vitamin C content. The experiment was conducted in a completely randomized split-plot scheme with treatments assigned to the plots (for the domestic market wax and wax + 1-MCP; for the external market wax, wax + 1-MCP, and 1-MCP + wax) and time to the subplots. The application of 1-MCP extended the shelf life of the papaya Tainung 01 fruits, independently of market destination, however more efficient when applied previously to the carnauba wax. / O objetivo desse trabalho foi avaliar os efeitos de 1-MCP e cera de carnaúba sobre a qualidade e a vida útil do mamão Tainung 01 (grupo Formosa) produzido no vale do Acaraú (CE), colhido em diferentes estádios de maturação e armazenado sob refrigeração (na propriedade, Marco, CE) e temperatura ambiente (na Embrapa Agroindústria Tropical, Fortaleza, CE). Os frutos foram tratados de acordo com o mercado de destino. Para o mercado interno, os tratamentos utilizados foram aplicações de cera a 18 % (testemunha) e cera seguida de 1-MCP; já para o mercado externo, foram utilizados as seguintes aplicações: cera (testemunha), cera seguida de 1- MCP e 1-MCP seguido de cera. Em seguida, os frutos foram mantidos armazenados em câmaras a 11 ± 1ºC e 90 ± 5% UR, por seis dias (mercado interno) e por 12 dias (mercado externo). Após o armazenamento na propriedade, os frutos foram transportados, em ambiente refrigerado, para a Embrapa Agroindústria Tropical (distante cerca de 240 quilômetros do local de produção), onde foram armazenados por mais 14 dias a 22 ± 2ºC e 60 ± 5% UR. Nesse período, a cada dois dias, avaliaram-se as aparências externa e interna, as colorações da casca e da polpa, a perda de massa, as firmezas interna e externa, o teor de sólidos solúveis, o pH, a acidez titulável e o teor de vitamina C. O delineamento utilizado foi o inteiramente casualizado, em esquema de parcelas subdivididas, aplicando-se nas parcelas os tratamentos (para o mercado interno cera e cera + 1-MCP; para o mercado externo cera, cera + 1-MCP e 1-MCP + cera) e nas subparcelas, o tempo. Constatou-se que a aplicação de 1-MCP prolongou a vida útil do mamão Tainung 01 , independentemente do tipo de mercado, sendo mais eficiente quando a aplicação foi feita antes da aplicação da cera de carnaúba.