数字农科院2.0

The cytokinin receptor OHK4/OsHK4 regulates inflorescence architecture in rice via an IDEAL PLANT ARCHITECTURE1/WEALTHY FARMER'S PANICLE-mediated positive feedback circuit

文献类型： 外文期刊

作者： Chun, Yan;Fang, Jingjing;Savelieva, Ekaterina M.;Lomin, Sergey N.;Shang, Jiangyuan;Sun, Yinglu;Zhao, Jinfeng;Kumar, Ashmit;Yuan, Shoujiang;Yao, Xuefeng;Liu, Chun-Ming;Arkhipov, Dmitry, V;Romanov, Georgy A.;Li, Xueyong

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期刊名称： PLANT CELL

ISSN： 1040-4651

年卷期： 2023 年

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收录情况： SCIE（2023版）

摘要： Inflorescence architecture is important for rice (Oryza sativa) grain yield. The phytohormone cytokinin (CK) has been shown to regulate rice inflorescence development; however, the underlying mechanism mediated by CK perception is still unclear. Employing a forward genetic approach, we isolated an inactive variant of the CK receptor OHK4/OsHK4 gene named panicle length1, which shows decreased panicle size due to reduced inflorescence meristem (IM) activity. A 2-amino acid deletion in the long alpha-helix stalk of the sensory module of OHK4 impairs the homodimerization and ligand-binding capacity of the receptor, even though the residues do not touch the ligand-binding domain or the dimerization interface. This deletion impairs CK signaling that occurs through the type-B response regulator OsRR21, which acts downstream of OHK4 in controlling inflorescence size. Meanwhile, we found that IDEAL PLANT ARCHITECTURE1(IPA1)/WEALTHY FARMER'S PANICLE (WFP), encoding a positive regulator of IM development, acts downstream of CK signaling and is directly activated by OsRR21. Additionally, we revealed that IPA1/WFP directly binds to the OHK4 promoter and upregulates its expression through interactions with 2 TCP transcription factors, forming a positive feedback circuit. Altogether, we identified the OHK4-OsRR21-IPA1 regulatory module, providing important insights into the role of CK signaling in regulating rice inflorescence architecture. A positive feedback circuit involving the cytokinin signaling cascade OHK4-HPts-OsRR21 and IDEAL PLANT ARCHITECTURE1/WEALTHY FARMER'S PANICLE regulates inflorescence architecture in rice.

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