Enhancing rice panicle branching and grain yield through tissue-specific brassinosteroid inhibition

文献类型： 外文期刊

第一作者： Zhang, Xiaoxing

作者： Zhang, Xiaoxing;Meng, Wenjing;Liu, Dapu;Yang, Yanzhao;Ma, Xiaoding;Yin, Wenchao;Niu, Mei;Dong, Nana;Liu, Jihong;Lu, Zefu;Qian, Qian;Tong, Hongning;Pan, Dezhuo;Shen, Weifeng;Liu, Yuqin;Zhao, Mingfu;Chen, Zhuo;Chu, Chengcai

作者机构：

期刊名称：SCIENCE （ 影响因子：44.7； 五年影响因子：50.3 ）

ISSN： 0036-8075

年卷期： 2024 年 383 卷 6687 期

页码：

收录情况： SCI

摘要： Crop yield potential is constrained by the inherent trade-offs among traits such as between grain size and number. Brassinosteroids (BRs) promote grain size, yet their role in regulating grain number is unclear. By deciphering the clustered-spikelet rice germplasm, we show that activation of the BR catabolic gene BRASSINOSTEROID-DEFICIENT DWARF3 (BRD3) markedly increases grain number. We establish a molecular pathway in which the BR signaling inhibitor GSK3/SHAGGY-LIKE KINASE2 phosphorylates and stabilizes OsMADS1 transcriptional factor, which targets TERMINAL FLOWER1-like gene RICE CENTRORADIALIS2. The tissue-specific activation of BRD3 in the secondary branch meristems enhances panicle branching, minimizing negative effects on grain size, and improves grain yield. Our study showcases the power of tissue-specific hormonal manipulation in dismantling the trade-offs among various traits and thus unleashing crop yield potential in rice.

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