Cotton GhMAX2 promotes single-celled fiber elongation by releasing the GhS1FA-mediated inhibition of fatty acid biosynthesis

文献类型： 外文期刊

第一作者： Sun, Yaru

作者： Sun, Yaru;Jin, Shuangxia;Sun, Yaru;Song, Guoli

作者机构：

关键词： Fiber elongation; GhMAX2; GhS1FA; Strigolactone; Upland cotton

期刊名称：PLANT CELL REPORTS （ 影响因子：4.5； 五年影响因子：6.1 ）

ISSN： 0721-7714

年卷期： 2025 年 44 卷 2 期

页码：

收录情况： SCI

摘要： Key messageCotton GhMAX2 positively regulates fiber elongation by mediating the degradation of GhS1FA, which transcriptionally represses GhKCS9 expression.AbstractStrigolactones (SLs) are known to promote cotton fiber development. However, the precise molecular relationship between SL signaling and fiber cell elongation remains unclear. In this study, we investigate the role of F-box E3 ligase MORE AXILLARY GROWTH2 (MAX2) in upland cotton in relation to the regulation of fiber development. GhMAX2b and GhMAX2f act as key components for SL signal transduction, with their loss-of-function leading to a notable reduction in fiber length. Biochemical analysis showed that GhMAX2b/f trigger the ubiquitination and subsequent degradation of the transcription repressor strigolactone-1-factor-At (GhS1FA), which function as a substrate for these E3 ligases. Furthermore, GhS1FA inhibits fatty acids biosynthesis by directly binding to the W-box element within the promoter of 3-ketoacyl-CoA synthases 9 (GhKCS9) and repressing its expression. In summary, we propose that GhMAX2b/f promote fiber elongation, potentially operating partially independently of GhD53 degradation.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序