数字农科院2.0

SUBSTANDARD STARCH GRAIN7 regulates starch grain size and endosperm development in rice

文献类型： 外文期刊

作者： Yan, Haigang;Ren, Yulong;Zhang, Binglei;Jin, Jie;Du, Feilong;Shan, Zhuangzhuang;Fu, Yushuang;Zhu, Yun;Wang, Xin;Zhu, Changyuan;Cai, Yue;Zhang, Jie;Wang, Fan;Zhang, Xiao;Wang, Rongqi;Wang, Yongxiang;Xu, Hancong;Jiang, Ling;Liu, Xi;Zhu, Shanshan;Lin, Qibing;Lei, Cailin;Cheng, Zhijun;Wang, Yihua;Zhang, Wenwei;Wan, Jianmin

作者机构：

关键词： rice (Oryza sativa);endosperm;starch;starch grain size;translocon

期刊名称： PLANT BIOTECHNOLOGY JOURNAL

ISSN： 1467-7644

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Starch is synthesized as insoluble, semicrystalline particles within plant chloroplast and amyloplast, which are referred to as starch grains (SGs). The size and morphology of SGs in the cereal endosperm are diverse and species-specific, representing a key determinant of the suitability of starch for industrial applications. However, the molecular mechanisms modulating SG size in cereal endosperm remain elusive. Here, we functionally characterized the rice (Oryza sativa) mutant substandard starch grain7 (ssg7), which exhibits enlarged SGs and defective endosperm development. SSG7 encodes a plant-specific DUF1001 domain-containing protein homologous to Arabidopsis (Arabidopsis thaliana) CRUMPLED LEAF (AtCRL). SSG7 localizes to the amyloplast membrane in developing endosperm. Several lines of evidence suggest that SSG7 functions together with SSG4 and SSG6, known as two regulators essential for SG development, to control SG size, by interacting with translocon-associated components, which unveils a molecular link between SG development and protein import. Genetically, SSG7 acts synergistically with SSG4 and appears to be functional redundancy with SSG6 in modulating SG size and endosperm development. Collectively, our findings uncover a multimeric functional protein complex involved in SG development in rice. SSG7 represents a promising target gene for the biotechnological modification of SG size, particularly for breeding programs aimed at improving starch quality.

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