GhMYB102 affects cotton fibre elongation and secondary wall thickening by regulating GhIRX10 in cotton
文献类型： 外文期刊
作者： Wu, Aimin 1 ; Shen, Tong 1 ; Lu, Jianhua 1 ; Fu, Xiaokang 1 ; Yang, Miaoqian 1 ; Sun, Mengxi 1 ; Ma, Liang 1 ; Lian, Boying 1 ; Wu, Hongmei 1 ; Li, Yiran 1 ; Yu, Shuxun 1 ; Wei, Hengling 1 ; Wang, Hantao 1 ;
作者机构： 1.Inst Cotton Res, Chinese Acad Agr Sci, State Key Lab Cotton Biobreeding & Integrated Util, Anyang, Henan, Peoples R China
2.Zhengzhou Univ, State Key Lab Cotton Biobreeding & Integrated Util, Zhengzhou Res Base, Zhengzhou, Henan, Peoples R China
3.Chinese Acad Agr Sci, Western Agr Res Ctr, Changji, Xinjiang, Peoples R China
关键词：
cotton; fibre development;
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：10.5； 五年影响因子：12.4 ）
ISSN： 1467-7644
年卷期： 2025 年 23 卷 4 期
页码：
收录情况： SCI
摘要： Upland cotton (Gossypium hirsutum) is a principal economic crop and a fundamental raw material for the textile industry. The quality of cotton fibres is significantly influenced by the synthesis of cell wall polysaccharides. This study focuses on GhIRX10, a beta-1,4-xylosyltransferase crucial for xylan backbone synthesis. Overexpression of GhIRX10 enhances xylan synthesis, which impacts fibre elongation and secondary cell wall thickening. GhMYB102, identified as a direct regulator of GhIRX10 expression, was confirmed through comprehensive validation. Overexpression of GhMYB102 resulted in a similar phenotype as OE-GhIRX10: increased cell wall thickness and reduced fibre length. Overexpression of GhMYB102 upregulated the expression of key cell wall synthesis-related genes, including GhCESA4/7/8, GhIRXs, GhCESAs, GhGUXs, GhTBLs, GhXTHs, and GhXXTs. Consequently, the cellulose and hemicellulose contents in OE-GhMYB102 lines were significantly increased. GhMYB102 was also validated as a target gene regulated by GhFSN1 and GhMYB7, with the ability to reciprocally regulate GhFSN1 expression. In summary, we propose a regulatory model where GhMYB102 promotes the expression of GhIRX10 and other cell wall-related genes, thereby affecting fibre quality. This study elucidates the regulatory network of secondary cell wall synthesis in cotton and provides potential targets for improving fibre quality through molecular breeding.
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