Strigolactones modulate cotton fiber elongation and secondary cell wall thickening  

作　　者：Yunze Wen Peng He Xiaohan Bai Huizhi Zhang Yunfeng Zhang Jianing Yu 

机构地区：[1]College of Life Sciences,Shaanxi Normal University,Xi’an 710119,China

出　　处：《Journal of Integrative Agriculture》2024年第6期1850-1863,共14页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (32170367 and 32000146);the Fundamental Research Funds for the Central Universities, China (2021TS066 and GK202103063);the Excellent Graduate Training Program of Shaanxi Normal University, China (LHRCCX23181).

摘　　要：Cotton is one of the most important economic crops in the world,and it is a major source of fiber in the textile industry.Strigolactones(SLs)are a class of carotenoid-derived plant hormones involved in many processes of plant growth and development,although the functions of SL in fiber development remain largely unknown.Here,we found that the endogenous SLs were significantly higher in fibers at 20 days post-anthesis(DPA).Exogenous SLs significantly increased fiber length and cell wall thickness.Furthermore,we cloned three key SL biosynthetic genes,namely GhD27,GhMAX3,and GhMAX4,which were highly expressed in fibers,and subcellular localization analyses revealed that GhD27,GhMAX3,and GhMAX4 were localized in the chloroplast.The exogenous expression of GhD27,GhMAX3,and GhMAX4 complemented the physiological phenotypes of d27,max3,and max4 mutations in Arabidopsis,respectively.Knockdown of GhD27,GhMAX3,and GhMAX4 in cotton resulted in increased numbers of axillary buds and leaves,reduced fiber length,and significantly reduced fiber thickness.These findings revealed that SLs participate in plant growth,fiber elongation,and secondary cell wall formation in cotton.These results provide new and effective genetic resources for improving cotton fiber yield and plant architecture.

关 键 词：STRIGOLACTONES fiber elongation secondary cell wall thickening COTTON 

分 类 号：S562[农业科学—作物学]