Combined genome and transcriptome analysis of elite fiber quality in Gossypium barbadense

文献类型： 外文期刊

第一作者： Song, Xiaohui

作者： Song, Xiaohui;Zhu, Guozhong;Su, Xiujuan;Yu, Yujia;Duan, Yujia;Wang, Haitang;Shang, Xiaoguang;Guo, Wangzhen;Song, Xiaohui;Zhu, Guozhong;Su, Xiujuan;Yu, Yujia;Duan, Yujia;Wang, Haitang;Shang, Xiaoguang;Guo, Wangzhen;Su, Xiujuan;Chen, Quanjia;Xu, Haijiang

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Gossypium barbadense, which is one of several species of cotton, is well known for its superior fiber quality. However, the genetic basis of its high-quality fiber remains largely unexplored. Here, we resequenced 269 G. barbadense accessions. Phylogenetic structure analysis showed that the set of accessions was clustered into 3 groups: G1 and G2 mainly included modern cultivars from Xinjiang, China, and G3 was related to widely introduced accessions in different regions worldwide. A genome-wide association study of 5 fiber quality traits across multiple field environments identified a total of 512 qtls (main-effect QTLs) and 94 qtlEs (QTL-by-environment interactions) related to fiber quality, of which 292 qtls and 57 qtlEs colocated with previous studies. We extracted the genes located in these loci and performed expression comparison, local association analysis, and introgression segment identification. The results showed that high expression of hormone-related genes during fiber development, introgressions from Gossypium hirsutum, and the recombination of domesticated elite allelic variation were 3 major contributors to improve the fiber quality of G. barbadense. In total, 839 candidate genes with encoding region variations associated with elite fiber quality were mined. We confirmed that haplotype GB_D03G0092H traced to G. hirsutum introgression, with a 1-bp deletion leading to a frameshift mutation compared with GB_D03G0092B, significantly improved fiber quality. GB_D03G0092H is localized in the plasma membrane, while GB_D03G0092B is in both the nucleus and plasma membrane. Overexpression of GB_D03G0092H in Arabidopsis (Arabidopsis thaliana) significantly improved the elongation of longitudinal cells. Our study systematically reveals the genetic basis of the superior fiber quality of G. barbadense and provides elite segments and gene resources for breeding high-quality cotton cultivars. High expression of hormone-related genes during fiber development, introgressions from Gossypium hirsutum, and domesticated elite allelic variation contribute to the superior fiber quality of Gossypium barbadense.

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