FLOURY ENDOSPERM16 encoding a NAD-dependent cytosolic malate dehydrogenase plays an important role in starch synthesis and seed development in rice

文献类型： 外文期刊

第一作者： Teng, Xuan

作者： Teng, Xuan;Zhong, Mingsheng;Zhu, Xiaopin;Wang, Chunming;Wang, Yunlong;Zhang, Huan;Jiang, Ling;Wang, Di;Hao, Yuanyuan;Wu, Mingming;Zhu, Jianping;Wang, Yihua;Wan, Jianmin;Ren, Yulong;Zhang, Xin;Guo, Xiuping;Wan, Jianmin

作者机构：

关键词： floury endosperm mutant; starch synthesis; grain weight; malate; energy supply; redox regulation; rice

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2019 年 17 卷 10 期

页码：

收录情况： SCI

摘要： Starch is the most important form of energy storage in cereal crops. Many key enzymes involved in starch biosynthesis have been identified. However, the molecular mechanisms underlying the regulation of starch biosynthesis are largely unknown. In this study, we isolated a novel floury endosperm rice (Oryza sativa) mutant flo16 with defective starch grain (SG) formation. The amylose content and amylopectin structure were both altered in the flo16 mutant. Map-based cloning and complementation tests demonstrated that FLO16 encodes a NAD-dependent cytosolic malate dehydrogenase (CMDH). The ATP contents were decreased in the mutant, resulting in significant reductions in the activity of starch synthesis-related enzymes. Our results indicated that FLO16 plays a critical role in redox homeostasis that is important for compound SG formation and subsequent starch biosynthesis in rice endosperm. Overexpression of FLO16 significantly improved grain weight, suggesting a possible application of FLO16 in rice breeding. These findings provide a novel insight into the regulation of starch synthesis and seed development in rice.

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