OsKANADI1 and OsYABBY5 regulate rice plant height by targeting GIBERELLIN 2-OXIDASE6

文献类型： 外文期刊

第一作者： He, Qi

作者： He, Qi;Yin, Caiyun;Wang, Quan;Wu, Hao;Zhang, Yong;Zeng, Longjun;Liao, Zhiqiang;Yin, Caiyun;Yin, Caiyun;Wang, Li;Tan, Yiqing;Lv, Wanqing;Xiong, Guosheng;Zheng, Xuelian;Zhang, Shuting;Han, Qinqin;Wang, Danning;Zhang, Yong

作者机构：

期刊名称：PLANT CELL （ 影响因子：11.6； 五年影响因子：12.1 ）

ISSN： 1040-4651

年卷期： 2024 年 37 卷 1 期

页码：

收录情况： SCI

摘要： Plant height is an important agronomic characteristic of rice ( Oryza sativa L. ). Map-based cloning analyses of a natural semi-dwarf rice mutant with inwardly curled leaves found in the field revealed that the defects were due to a mutation of a SHAQKYF-class MYB family transcription factor, OsKANADI1 (OsKAN1). OsKAN1 directly bound to the OsYABBY5 ( OsYAB5 ) promoter to repress its expression and interacted with OsYAB5 to form a functional OsKAN1-OsYAB5 complex. GIBERELLIN 2-OXIDASE6 ( OsGA2ox6 ), encoding an enzyme in the gibberellin (GA) catabolic pathway, was activated by OsYAB5. Furthermore, the OsKAN1-OsYAB5 complex suppressed the inhibitory effect of OsKAN1 toward OsYAB5 and inhibited OsYAB5-induced OsGA2ox6 expression. The proOsKAN1: OsYAB5 transgenic plants were taller than wild-type plants, whereas oskan1 proOsKAN1:OsYAB5 plants exhibited a severe dwarf phenotype due to the absence of the OsKAN1-OsYAB5 complex. The OsKAN1-OsYAB5 complex modulated OsGA2ox6 expression, thereby regulating the levels of bioactive gibberellins and, consequently, plant height. This study elucidated the mechanism underlying the effect of the OsKAN1-OsYAB5-OsGA2ox6 regulatory pathway on plant height at different positions in rice stems and provided insights on stem development and candidate genes for the aerial architecture improvement of crop plants.

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