Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/41881
Title: Response of soybean genotypes to the expression of green seed under temperature and water stresses
Other Titles: Reação de genótipos de soja quanto à expressão de sementes verdes em condições de estresses térmico e hídrico
Keywords: Glycine max
Chlorophyll
Chlorophyllase
Seed quality
Clorofila
Clorofilase
Qualidade fisiológica
Issue Date: 2009
Publisher: Associação Brasileira de Tecnologia de Sementes (ABRATES)
Citation: PÁDUA, G. P. de et al. Response of soybean genotypes to the expression of green seed under temperature and water stresses. Revista Brasileira de Sementes, Londrina, v. 31, n. 3, p. 140-149, 2009. DOI: 10.1590/S0101-31222009000300016.
Abstract: Soybeans grown under water stress associated with high temperatures during seed maturation and pre-harvest may produce green seed (GS) with expressive reduction in seed quality. The objectives of this study were to evaluate the response of different soybean cultivars grown under these stressful conditions regarding their susceptibility to GS production and to determine the chlorophyll retention levels and the chlorophyllase activity in the seeds. Seeds of four soybean cultivars [BRS 133, CD 206, MG/BR 46 (Conquista) and BRSMG 251 (Robusta)] were grown under greenhouse conditions until R5.5. At R6, the plants were transferred to phytotrons under temperature stress (from 28ºC to 36ºC) and with water stresses of 10% gravimetric moisture, no water and normal supply. Seeds were harvested at R9 when the percentage of GS and weight of 100 seeds were determined. The contents of a, b and total chlorophylls and the chlorophyllase activity were also determined. The expression of GS production under these conditions varied among cultivars: Conquista and Robusta were considered more susceptible to the production of GS compared to 'BRS 133' and 'CD 206'. These cultivars produced lower GS levels, lower chlorophyll retention and higher chlorophyllase activity compared to Robusta and Conquista. Soybean plants submitted to water and temperature stresses produced high levels of GS, which were small, light and had high chlorophyll contents and low chlorophyllase activity. The contents of a, b and total chlorophylls in GS were inversely proportional to the chlorophyllase activity.
URI: http://repositorio.ufla.br/jspui/handle/1/41881
Appears in Collections:DQI - Artigos publicados em periódicos



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