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

文献类型： 外文期刊

作者： Zhang, Xiaoxing 1 ; Meng, Wenjing 1 ; Liu, Dapu 1 ; Pan, Dezhuo 2 ; Yang, Yanzhao 1 ; Chen, Zhuo 3 ; Ma, Xiaoding 1 ; Yin, Wenchao 1 ; Niu, Mei 1 ; Dong, Nana 1 ; Liu, Jihong 1 ; Shen, Weifeng 2 ; Liu, Yuqin 2 ; Lu, Zefu 1 ; Chu, Chengcai 3 ; Qian, Qian 1 ; Zhao, Mingfu 2 ; Tong, Hongning 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

2.Fujian Acad Agr Sci, Rice Res Inst, Fuzhou 350018, Peoples R China

3.Chinese Acad Sci, Inst Genet & Dev Biol, Beijing 100101, Peoples R China

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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