数字农科院2.0

Rice floury endosperm26 encoding a mitochondrial single-stranded DNA-binding protein is essential for RNA-splicing of mitochondrial genes and endosperm development

文献类型： 外文期刊

作者： Xuan Teng;Yongfei Wang;Linglong Liu;Hang Yang;Mingming Wu;Xiaoli Chen;Yulong Ren;Yunlong Wang;Erchao Duan;Hui Dong;Ling Jiang;Yuanyan Zhang;Wenwei Zhang;Rongbo Chen;Shijia Liu;Xi Liu;Yunlu Tian;Liangming Chen;Yihua Wang;Jianmin Wan

作者机构：

关键词： Floury endosperm;Mitochondrion;Oryza sativa;RNA splicing;Single-stranded DNA-binding protein

期刊名称： Plant Science

ISSN： 0168-9452

年卷期： 2024 年 346 卷

页码：

收录情况： SCIE（2024版）

摘要： Endosperm, the major storage organ in cereal grains, determines the grain yield and quality. Mitochondria provide the energy for dry matter accumulation, in the endosperm development. Although mitochondrial single-stranded DNA-binding proteins (mtSSBs) play a canonical role in the maintenance of single-stranded mitochondrial DNA, their molecular functions in RNA processing and endosperm development remain obscure. Here, we report a defective rice endosperm mutant, floury endosperm26 (flo26), which develops abnormal starch grains in the endosperm. Map-based cloning and complementation experiments showed that FLO26 allele encodes a mitochondrial single-stranded DNA-binding protein, named as mtSSB1.1. Loss of function of mtSSB1.1 affects the transcriptional level of many mitochondrially-encoded genes and RNA splicing of nad1, a core component of respiratory chain complex I in mitochondria. As a result, dysfunctional mature nad1 led to dramatically decreased complex I activity, thereby reducing ATP production. Our results reveal that mtSSB1.1 plays an important role in the maintenance of mitochondrial function and endosperm development by stabilizing the splicing of mitochondrial RNA in rice.

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