Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Zonta, João Batista; Araújo, Eduardo Fontes; Araújo, Roberto Fontes

doi:10.1590/s0101-31222011000400014

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…Drying air temperature was approximately 55 °C and it did not immediately affect seed quality, agreeing with Costa et al (2012a) but contradicting results found by Costa et al (2012b), who reported that temperatures close to 60 °C is detrimental to the germination of crambe seeds. Zonta et al (2011) and Ullmann et al (2010) found no effect of drying temperatures respectively of 43 °C and 60 °C on the germination of Jatropha seeds.…”

Section: Resultsmentioning

confidence: 96%

Seed quality of crambe (Crambe abyssinicaHochst) submitted to different drying methods

Silva

Lima

Biaggioni

et al. 2016

Revista Ciência Agronômica

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-The objective of this research was to evaluate the effects of different drying methods on physiological quality of crambe seeds. Crambe seeds of FMS Brilhante cultivar were produced in the Lageado experimental farm (UNESP, Botucatu, Brazil) in 2012. The drying methods were: artificial drying with hot air, artificial drying with fresh air, natural yard drying, natural shade drying and natural field drying. The water content of seeds was monitored before, during and after drying. Germination, first germination count, abnormal seedlings, GSI, germination synchronization, frequency and germination mean time, electrical conductivity, fatty acid index and oil content were evaluated in order to know the physiological quality. The experimental design was randomized and the averages compared by the t-test at 5% significance. Results showed that artificial hot air drying favored with higher germination and vigor of crambe seeds when compared to other drying methods and demanded shorter time to reduce the water content. The natural shade drying method is feasible for crambe seeds despite taking longer.Key words: Natural drying. Artificial drying. Crambe seeds vigor. Seeds damage.RESUMO -Objetivou-se nesta pesquisa avaliar o efeito de diferentes métodos de secagem na qualidade fisiológica de sementes de crambe. As sementes de crambe da cultivar FMS Brilhante foram produzidas na Fazenda Experimental Lageado (UNESP -Botucatu) no ano de 2012. As condições de secagem foram: secagem artificial com ar aquecido, secagem artificial com ar natural, secagem natural em terreiro, secagem natural à sombra e secagem na planta. O teor de água foi monitorado antes, durante e após a secagem. Para avaliação da qualidade fisiológica foi realizado o teste de germinação, primeira contagem de germinação, plântulas anormais, IVG, sincronização da germinação, frequência e tempo médio de germinação, teste de condutividade elétrica, índice de acidez graxa e teor de óleo. O delineamento experimental foi inteiramente casualizado e as médias comparadas pelo teste de Tukey a 5% de significância. Pelos resultados obtidos a secagem artificial com alta temperatura favoreceu obtenção de sementes de crambe com alta germinação e vigor em relação aos demais tipos de secagem com um tempo menor para redução do teor de água. A secagem natural na sombra é viável para sementes de crambe apesar de ser longa.Palavras-chave: Secagem natural. Secagem artificial. Vigor de sementes de crambe. Danos em sementes.

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Section: Resultsmentioning

confidence: 96%

Seed quality of crambe (Crambe abyssinicaHochst) submitted to different drying methods

Silva

Lima

Biaggioni

et al. 2016

Revista Ciência Agronômica

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“…This could lead to less harmful alteration to the seeds of fruits of the yellow and brownish-yellow stages and could consequently lower EC values. It was previously reported that rapid drying is better for J. curcas seed quality (Zonta, Araújo, Araújo, & Dias, 2011).…”

Section: Discussionmentioning

confidence: 97%

<b>Lipid peroxidation and antioxidant enzymes of <i>Jatropha curcas</i> L. seeds stored at different maturity stages

et al. 2018

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ABSTRACT. The objective of the present work was to investigate the antioxidant enzyme activities and the occurrence of lipid peroxidation during storage of J. curcas seeds obtained from fruits at different maturity stages. Seeds extracted from fruits collected at three stages of maturity were used, i.e., yellow, brownish-yellow, and brown (dry fruits). The seeds were subsequently stored for 18 months in Kraft paper bags in a laboratory environment. Initially as well as every three months, the seeds were evaluated for germination and electrical conductivity, and the seed embryos were evaluated for lipid peroxidation; protein content; and superoxide dismutase, peroxidase, and ascorbate peroxidase enzyme activity at the same time points. In general, the seeds from the three stages of fruit maturity did not differ regarding germination throughout the entire period of storage, although a reduction in viability was observed after nine months of storage. The electrical conductivity increased during storage and was greater for the seeds obtained from brown fruits. There was a reduction in protein content and in enzyme activities in the seed embryo, except for superoxide dismutase. No relationship was observed between reduction in seed viability and lipid peroxidation. Thus, J. curcas seeds with high initial quality can be stored under environmental conditions for up to 9, 15 and 15 months for brown (dry), yellow and brownish-yellow fruits, respectively, without a significant reduction in germination but with a reduction in seed vigour.Keywords: physic nut, seed maturation and deterioration, enzyme activity, malondialdehyde content.Peroxidação de lipídios e enzimas antioxidativas em sementes de Jatropha curcas L. armazenadas em diferentes estágios de maturação RESUMO. O objetivo do presente trabalho foi avaliar a atividade de enzimas antioxidativas e a peroxidação de lipídios durante o armazenamento de sementes de J. curcas em diferentes estádios de maturação. Foram utilizadas sementes extraídas de frutos colhidos com coloração externa da casca amarela, amarela-marrom e marrom (frutos secos). As sementes foram armazenadas por 18 meses, em embalagem de papel Kraft em ambiente de laboratório. Inicialmente e a cada três meses, as sementes foram avaliadas quanto à germinação e condutividade elétrica, e os embriões das sementes foram avaliados quanto a peroxidação de lipídios, conteúdo de proteínas e atividade das enzimas superóxido dismutase, peroxidases e peroxidase do ascorbato. Em geral, as sementes dos três estádios de maturação dos frutos não diferiram quanto à germinação durante todo o período de armazenamento, embora tenha sido observada uma redução da germinação a partir de nove meses de armazenamento. Houve redução no conteúdo de proteína e na atividade das enzimas antioxidantes no embrião das sementes dos três estádios de maturação, com exceção da superóxido dismutase. Não foi observada relação entre a redução da viabilidade das sementes e a peroxidação de lipídios. Sementes de J. curcas com elevada qualidade inici...

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“…The collected fruits had predominantly brown epicarps (Dranski et al 2010). The J. curcas fruits were dried in the shade for 45 days, with no control over temperature and humidity (Zonta et al 2011) to facilitate manual seed extraction from fruits.…”

Section: Methodsmentioning

confidence: 99%

Physiological quality and seed respiration of primed Jatropha curcas seeds

et al. 2017

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Seed deterioration is a natural and irreversible process. Nevertheless, seed priming with water and antioxidants can minimize oxidative damage in oilseeds, resulting in attenuation of seed deterioration. Th e objective of this assay was to evaluate seed priming on respiratory activity of Jatropha curcas submitted to accelerated aging. Seeds from two provenances (Janauba and Pedro J. Caballero) were submitted to three priming treatments (control, immersion in deionized water, and with 750 µmol L -1 of ascorbic acid) and treated for accelerated aging at 41 °C for 72 h. Th e results showed that the priming of J. curcas seeds promoted tolerance to accelerated aging. Primed seeds, with ascorbic acid from Janauba and deionized water from Pedro J. Caballero, resulted in a higher percentage of normal seedlings, and increased germination speed index and seed respiration. Th e decline of physiological quality of J. curcas seeds after accelerated aging is directly associated with a reduction in respiratory activity that is related to seed moisture content.

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Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Cited by 13 publications

References 10 publications

Seed quality of crambe (Crambe abyssinicaHochst) submitted to different drying methods

Seed quality of crambe (Crambe abyssinicaHochst) submitted to different drying methods

<b>Lipid peroxidation and antioxidant enzymes of <i>Jatropha curcas</i> L. seeds stored at different maturity stages

Physiological quality and seed respiration of primed Jatropha curcas seeds

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