数字农科院2.0

BnaGSK3-BnaIDD16 module negatively regulates branch angle in Brassica napus

文献类型： 外文期刊

作者： Xiaodong Wang;Jun Yu;Ying Cai;Min Tang;Liang Zhang;Feng Chen;Jinglin Liu;Hongfang Liu;William Terzaghi;Wei Hua;Jiefu Zhang;Ming Zheng

作者机构：

关键词： BnaGSK3;BnaIDD16;branch angle;Brassica napus;brassinosteroid

期刊名称： Plant Journal

ISSN： 0960-7412

年卷期： 2025 年 123 卷 3 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Brassinosteroids (BRs) play a key role in regulating plant height and leaf angle in plants. However, the mechanism underlying the BR signaling pathway involved in branch angle regulation is poorly understood. Here, we isolated a rapeseed (Brassica napus L.) mutant named dwarf and compact architecture 1 (dca1), which is controlled by a single semi-dominant locus. Map-based cloning revealed that this gain-of-function gene encodes a GSK3/SHAGGY-like kinase (BnaGSK3/DCA1). We demonstrated that BnaIDD16.A09 is a substrate phosphorylated by BnaGSK3/DCA1 and negatively controls branch angles by activating auxin biosynthesis in response to gravitropism. Further, we identified two elite haplotypes from natural germplasm with large variations in the BnaGSK3/DCA1 promoter that exhibited smaller branch angles and slightly shorter height, which have significant potential for improvement of rapeseed plant architecture. Our findings reveal a regulatory mechanism that the BnaGSK3-BnaIDD16 module integrates BR signaling to modulate auxin biosynthesis, thereby controlling branch bending in B. napus.

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