数字农科院2.0

Strigolactone-gibberellin crosstalk mediated by a distant silencer fine-tunes plant height in upland cotton

文献类型： 外文期刊

作者： Zailong Tian;Baojun Chen;Hongge Li;Xinxin Pei;Yaru Sun;Gaofei Sun;Zhaoe Pan;Panhong Dai;Xu Gao;Xiaoli Geng;Zhen Peng;Yinhua Jia;Daowu Hu;Liru Wang;Baoyin Pang;Ai Zhang;Xiongming Du;Shoupu He

作者机构：

关键词： gibberellin 2-oxidase 1A;phytohormone crosstalk;plant height;silencer

期刊名称： Molecular plant

ISSN： 1752-9867

年卷期： 2024 年 17 卷 10 期

页码：

收录情况： SCIE（2024版） ; ; CSCD（2023-2024年度） ; ; 科技核心（2024版）

摘要： Optimal plant height is crucial in modern agriculture, influencing lodging resistance and facilitating mechanized crop production. Upland cotton (Gossypium hirsutum) is the most important fiber crop globally; however, the genetic basis underlying plant height remains largely unexplored. In this study, we conducted a genome-wide association study to identify a major locus controlling plant height (PH1) in upland cotton. This locus encodes gibberellin 2-oxidase 1A (GhPH1) and features a 1133-bp structural variation (PAVPH1) located approximately 16 kb upstream. The presence or absence of PAVPH1 influences the expression of GhPH1, thereby affecting plant height. Further analysis revealed that a gibberellin-regulating transcription factor (GhGARF) recognizes and binds to a specific CATTTG motif in both the GhPH1 promoter and PAVPH1. This interaction downregulates GhPH1, indicating that PAVPH1 functions as a distant upstream silencer. Intriguingly, we found that DWARF53 (D53), a key repressor of the strigolactone (SL) signaling pathway, directly interacts with GhGARF to inhibit its binding to targets. Moreover, we identified a previously unrecognized gibberellin-SL crosstalk mechanism mediated by the GhD53-GhGARF-GhPH1/PAVPH1 module, which is crucial for regulating plant height in upland cotton. These findings shed light on the genetic basis and gene interaction network underlying plant height, providing valuable insights for the development of semi-dwarf cotton varieties through precise modulation of GhPH1 expression.

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