数字农科院2.0

Natural variation in OsTPS8 confers differential regulation of chalkiness and seed vigor in indica and japonica rice

文献类型： 外文期刊

作者： 陈小丽;;任玉龙;;董慧;;蒋小康;;郑小明;;段二超;;滕烜;;王云龙;;顾传炜;;陈荣波;;王庆凯;;王永飞;;张伊鹏;;张茹双;;张云鹏;;赵文杰;;张玉;;杨学;;周磊;;李超;;单调风;;鲍依群;;田云录;;刘喜;;刘世家;;郭涛;;陈明江;;王海洋;;王益华;;万建民

关键词： OsTPS8

期刊名称： NATURE GENETICS

ISSN： 1061-4036

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Chalkiness and seed vigor are major agronomic traits affecting rice grain quality and productivity, respectively. Little is known about the intrinsic relationship and the regulatory mechanisms of these two traits. Here we identified a chalkiness locus qPGWC-8, which encodes trehalose- 6-phosphate synthase 8 (OsTPS8) that suppresses trehalose-6-phosphate (Tre6P) biosynthesis by interacting with and inhibiting OsTPS1. A natural promoter variation in OsTPS8 confers differential transcriptional regulation by OsbHLH001. Elevated expression of OsTPS8 reduces Tre6P levels, activates the expression of OsMYBS1 and α-amylase genes, thus promoting starch degradation, chalkiness formation and seed vigor elevation. Two major haplotypes, OsTPS8ASO and OsTPS8IR24, were defined by this functional promoter variation, with OsTPS8IR24 preferentially selected during the domestication of indica rice. Collectively, our findings establish an OsbHLH001-OsTPS8-Tre6P-α-amylase signaling cascade that has a dual role in regulating grain chalkiness and seed vigor, which reveals a molecular link between the appearance quality and seed vigor of rice.

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