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- W2375620834 abstract "Aims Our objective was to elucidate the physiological causes of the influence of soil water deficit on grain-filling and rice (Oryza sativa) yield by evaluating enzyme activities involved in sucrose-starch synthesis during the grain-filling period. Methods Two rice cultivars (‘Shanyou 63’ and ‘Pc311/Zaoxiandang’) were grown in cement containers. Controlled soil water deficit was imposed at 9th day after flowering because the division of endosperm cells is sensitive to water deficit. The activities of key enzymes involved in the metabolism of sucrose to starch during grain-filling were evaluated. Important findings The 1000-grain weight and rice yield under soil water deficit were significantly decreased. The key enzyme activities, including sucrose synthase, adenine diphosphoglucose pyrophosphorylase, soluble starch synthase and starch branching enzyme, involved in the metabolism of sucrose to starch were significantly increased under soil water deficit during 10–20 days after anthesis. However, the activities of these enzymes under soil water-deficit were decreased rapidly 20–30 days after flowering compared to well-watered treatments. Active grain-filling periods of the water-deficit treatments were shortened as a result of the decrease of starch accumulation. Therefore, the rapid decline of the key enzyme activities involved in sucrose to starch metabolism and the shortage of assimilation supply at 20–30 days after anthesis are reasons for decreases in grain weight and yield under soil water deficit conditions." @default.
- W2375620834 created "2016-06-24" @default.
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- W2375620834 date "2011-01-01" @default.
- W2375620834 modified "2023-09-28" @default.
- W2375620834 title "Effects of soil water deficit on physiological causes of rice grain-filling" @default.
- W2375620834 hasPublicationYear "2011" @default.
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