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Hormonal Changes inthe Grains of RiceSubjected to WaterStress during GrainFilling Jianchang YangJianhua ZhangZhiqing Wang2001 год

Hormonal Changes in the Grains of Rice Subjected to Water Stress during Grain Filling
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Abstract Lodging-resistant rice (Oryza sativa) cultivars usually show slow grain filling when nitrogen is applied in large amounts. This study investigated the possibility that a hormonal change may mediate the effect of water deficit that enhances whole plant senescence and speeds up grain filling. Two rice cultivars showing high lodging resistance and slow grain filling were field grown and applied with either normal or high amount nitrogen (HN) at heading. Well-watered and water-stressed (WS) treatments were imposed 9 days post anthesis to maturity. Results showed that WS increased partitioning of fixed 14CO2 into grains, accelerated the grain filling rate but shortened the grain filling period, whereas the HN did the opposite way. Cytokinin (zeatin + zeatin riboside) and indole-3-acetic acid contents in the grains transiently increased at early filling stage and WS treatments hastened their declines at the late grain filling stage. Gibberellins (GAs; GA1 + GA4) in the grains were also high at early grain filling but HN enhanced, whereas WS substantially reduced, its accumulation. Opposite to GAs, abscisic acid (ABA) in the grains was low at early grain filling but WS remarkably enhanced its accumulation. The peak values of ABA were significantly correlated with the maximum grain filling rates (r = 0.92**,P < 0.01) and the partitioning of fixed14C into grains (r = 0.95**,P < 0.01). Exogenously applied ABA on pot-grown HN rice showed similar results as those by WS. Results suggest that an altered hormonal balance in rice grains by water stress during grain filling, especially a decrease in GAs and an increase in ABA, enhances the remobilization of prestored carbon to the grains and accelerates the grain filling rate.
Год издания: 2001
Авторы: Jianchang Yang, Jianhua Zhang, Zhiqing Wang, Qingsen Zhu, Wei Wang
Издательство: Oxford University Press
Источник: PLANT PHYSIOLOGY
Ключевые слова: Rice Cultivation and Yield Improvement, Crop Yield and Soil Fertility, Research in Cotton Cultivation
Другие ссылки: PLANT PHYSIOLOGY (PDF)
PLANT PHYSIOLOGY (HTML)
PubMed Central (HTML)
PubMed (HTML)