摘要
以杂交籼稻特优559为材料,探讨了高温胁迫对水稻灌浆期剑叶中有关生理特性和籽粒灌浆速率的影响。结果表明:高温胁迫加速了剑叶叶绿素的丧失,使SOD活性明显降低,质膜透性和MDA含量明显增加,脯氨酸、AsA、GSH、可溶性蛋白质以及可溶性糖含量明显降低,籽粒灌浆速率和籽粒重下降。高温使灌浆期水稻叶片衰老加速、光合能力下降是其导致灌浆速率、结实率、粒重和籽粒产量降低的主要生理原因。
The effects of high temperature on grain filling rate and some physiological indexes in flag leaves in hybrid rice Teyou 559 were studied. The results showed that chlorophyll content and superoxide dismutase （SOD） activity in flag leaves were lower significantly by high temperature stress （Figs. 2A and 3A）. The electrolyte leakage and malondialdehyde （MDA） content were higher significantly under high temperature stress （Figs.2B and 3B）. The proline （Pro）, ascorbic acid （AsA）, glutathione （GSH）, soluble protein and soluble sugar contents were lower significantly by high temperature stress than those of the control （Figs.4, 5 and 6）. Both the rate of grain filling and grain dry matter accumulation become lower significantly underhigh temperature stress （Figs.7 and 8）. Therefore, it was suggested that high temperature accelerated the senescence of rice leaf and decreased the photosynthesis rate during grain filling period, and then which was the main reason in physiology which resulted the decrease of grain filling rate, seed setting rate, grain weight and yield.
出处
《植物生理与分子生物学学报》
CAS
CSCD
北大核心
2005年第6期657-662,共6页
Journal Of Plant Physiology and Molecular Biology
基金
江苏省自然科学基金项目(No.BK2004002)
国家自然科学基金项目(No.30470332)资助。~~
关键词
杂交水稻
高温胁迫
生理特性
灌浆速率
hybrid rice
high temperature stress
physiological characteristic
grain filling rate
作者简介
通讯作者（E-mail：Tangrs@jaas．ac．cn；Tel：025-84390295）。
