Substandard starch grain4 may function in amyloplast development by influencing starch and lipid metabolism in rice endosperm

文献类型： 外文期刊

第一作者： Cai, Yue

作者： Cai, Yue;Xiao, Ning;Wu, Yunyu;Yu, Ling;Chen, Zichun;Liu, Jianju;Shi, Wei;Pan, Cunhong;Li, Yuhong;Zhou, Changhai;Ji, Hongjuan;Huang, Niansheng;Zhang, Xiaoxiang;Li, Aihong;Cai, Yue;Li, Aihong;Chen, Haiyuan;Zhang, Yunhui

作者机构：

关键词： Rice; Floury endosperm; Starch biosynthesis; Lipid biosynthesis; Genetic analysis; Map-based cloning

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.686； 五年影响因子：4.352 ）

ISSN： 0176-1617

年卷期： 2022 年 270 卷

页码：

收录情况： SCI

摘要： The amyloplast is a specialized plastid in rice endosperm cells where starch is synthesized and stored as starch granules (SGs). However, little is known about the molecular mechanism underlying amyloplast and SG development. In this study, a novel mutant (c134) demonstrating a floury endosperm with enlarged SGs and amyloplasts was identified. The floury endosperm was caused by rounder, loosely packed SG. Grain-quality profile and expression analysis showed reduced contents of total starch and amylose in the c134 mutant, as well as reduced expression of a number of genes involved in starch biosynthesis. Galactosyldiacylglycerol (GDG) content and fatty acid synthesis play important roles in plastid development, and in the c134 endosperm, an obvious decrease in GDG and various fatty acids was observed, with down-regulated expression of various genes involved in lipid biosynthesis. Furthermore, map-based cloning revealed an amino acid substitution (glycine to aspartic acid) in the substandard starch grain4 (SSG4) protein. The results of this study suggest that SSG4 influences the regulation of starch and lipid metabolism as well as amyloplast development, a finding that is useful for potential genetic improvement of rice grain quality in future starch and lipid breeding and biotechnology.

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