数字农科院2.0

FLOURY ENDOSPERM24, a heat shock protein 101 (HSP101), is required for starch biosynthesis and endosperm development in rice

文献类型： 外文期刊

作者： Wu, Hongming;Ren, Yulong;Dong, Hui;Xie, Chen;Zhao, Lei;Wang, Xin;Zhang, Fulin;Zhang, Binglei;Jiang, Xiaokang;Huang, Yunshuai;Jing, Ruonan;Wang, Jian;Miao, Rong;Bao, Xiuhao;Yu, Mingzhou;Nguyen, Thanhliem;Mou, Changling;Wang, Yunlong;Wang, Yihua;Lei, Cailin;Cheng, Zhijun;Jiang, Ling;Wan, Jianmin

作者机构：

关键词： endosperm development;FLO24;heat stress;plastid;rice;starch biosynthesis

期刊名称： NEW PHYTOLOGIST

ISSN： 0028-646X

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： center dot Endosperm is the main storage organ in cereal grain and determines grain yield and quality. The molecular mechanisms of heat shock proteins in regulating starch biosynthesis and endosperm development remain obscure. center dot Here, we report a rice floury endosperm mutant flo24 that develops abnormal starch grains in the central starchy endosperm cells. Map-based cloning and complementation test showed that FLO24 encodes a heat shock protein HSP101, which is localized in plastids. The mutated protein FLO24(T296I) dramatically lost its ability to hydrolyze ATP and to rescue the thermotolerance defects of the yeast hsp104 mutant. center dot The flo24 mutant develops more severe floury endosperm when grown under high-temperature conditions than normal conditions. And the FLO24 protein was dramatically induced at high temperature. FLO24 physically interacts with several key enzymes required for starch biosynthesis, including AGPL1, AGPL3 and PHO1. Combined biochemical and genetic evidence suggests that FLO24 acts cooperatively with HSP70cp-2 to regulate starch biosynthesis and endosperm development in rice. center dot Our results reveal that FLO24 acts as an important regulator of endosperm development, which might function in maintaining the activities of enzymes involved in starch biosynthesis in rice.

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