OsLEA1b Modulates Starch Biosynthesis at High Temperatures in Rice

文献类型： 外文期刊

第一作者： Li, Gang

作者： Li, Gang;Cao, Ruijie;Ma, Liuyang;Jiao, Guiai;Chen, Pengfei;Dong, Nannan;Li, Xinwei;Duan, Yingqing;Li, Xiaoxue;Shao, Gaoneng;Sheng, Zhonghua;Hu, Shikai;Tang, Shaoqing;Wei, Xiangjin;Hu, Peisong;Zhu, Mingdong;Yu, Yinghong

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关键词： high temperature; OsLEA1b; rice grain quality; starch biosynthesis

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN：

年卷期： 2023 年 12 卷 23 期

页码：

收录情况： SCI

摘要： High temperatures accelerate the accumulation of storage material in seeds, often leading to defects in grain filling. However, the mechanisms regulating grain filling at high temperatures remain unknown. Here, we want to explore the quality factors influenced by the environment and have identified a LATE EMBROYGENESIS ABUNDANT gene, OsLEA1b, a heat-stress-responsive gene in rice grain filling. OsLEA1b is highly expressed in the endosperm, and its coding protein localizes to the nucleus and cytoplasm. Knock-out mutants of OsLEA1b had abnormal compound starch granules in endosperm cells and chalky endosperm with significantly decreased grain weight and grain number per panicle. The oslea1b mutants exhibited a lower proportion of short starch chains with degrees of polymerization values from 6 to 13 and a higher proportion of chains with degrees from 14 to 48, as well as significantly lower contents of starch, protein, and lipid compared to the wild type. The difference was exacerbated under high temperature conditions. Moreover, OsLEA1b was induced by drought stress. The survival rate of oslea1b mutants decreased significantly under drought stress treatment, with significant increase in ROS levels. These results indicate that OsLEA1b regulates starch biosynthesis and influences rice grain quality, especially under high temperatures. This provides a valuable resource for genetic improvement in rice grain quality.

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