ENLARGED STARCH GRAIN1 affects amyloplast development and starch biosynthesis in rice endosperm

文献类型： 外文期刊

第一作者： Wang, Rongqi

作者： Wang, Rongqi;Yan, Haigang;Teng, Xuan;Zhu, Xiaopin;Jiang, Ling;Wang, Yihua;Wan, Jianmin;Ren, Yulong;Wang, Yupeng;Zhang, Xin;Guo, Xiuping;Lin, Qibing;Cheng, Zhijun;Lei, Cailin;Wang, Jiulin;Wan, Jianmin

作者机构：

关键词： Floury endosperm; Starch grain size; Amyloplast development; Starch biosynthesis; Oryza sativa

期刊名称：PLANT SCIENCE （ 影响因子：3.591； 五年影响因子：4.253 ）

ISSN： 0168-9452

年卷期： 2021 年 305 卷

页码：

收录情况： SCI

摘要： Cereal crops accumulate large amounts of starch which is synthesized and stored in amyloplasts in the form of starch grains (SGs). Despite significant progress in deciphering starch biosynthesis, our understanding of amyloplast development in rice (Oryza sativa) endosperm remains largely unknown. Here, we report a novel rice floury mutant named enlarged starch grain1 (esg1). The mutant has decreased starch content, altered starch physicochemical properties, slower grain -filling rate and reduced 1000-grain weight. A distinctive feature in esg1 endosperm is that SGs are much larger, mainly due to an increased number of starch granules per SG. Spherical and loosely assembled granules, together with those weakly stained SGs may account for decreased starch content in esg1. Map-based cloning revealed that ESG1 encodes a putative permease subunit of a bacterial-type ABC (ATP-binding cassette) lipid transporter. ESG1 is constitutively expressed in various tissues. It encodes a protein localized to the chloroplast and amyloplast membranes. Mutation of ESG1 causes defective galactolipid synthesis. The overall study indicates that ESG1 is a newly identified protein affecting SG development and subsequent starch biosynthesis, which provides novel insights into amyloplast development in rice.

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