Introgression from Gossypium hirsutum is a driver for population divergence and genetic diversity in Gossypium barbadense

作者：棉花生物学国家重点实验室 日期：2022-08-30 访问量：

Pengpeng Wang, Na Dong, Maojun Wang, Gaofei Sun, Yinhua Jia, Xiaoli Geng, Min Liu, Weipeng Wang, Zhaoe Pan, Qiuyue Yang, Hongge Li, Chunyan Wei, Liru Wang, Hongkun Zheng, Shoupu He, Xianlong Zhang, Qinglian Wang, Xiongming Du  

The Plant Journal

Doi: 10.1111/tpj.15702

Abstract：

During the domestication and improvement processes, interspecific introgression from Gossypium hirsutum has reorganized the genomic architecture of Gossypium barbadense; however, the introgression details and the trait-related genetic loci remain largely unknown. Here, we perform a genome-wide population analysis and genetically recategorize 365 G. barbadense accessions into four subgroups which is different from previous categorizations. A total of 315 introgression events from G. hirsutum to G. barbadense, which primarily contributed to population divergence and agronomic trait variation in G. barbadense, are identified. We find that 70% introgression from G. hirsutum have greatly increased the genetic diversity and divergence of G. barbadense. Some loci are identified with divergent haplotype selection for adaptation to the environment at high latitudes. Through genome-wide association study and genome linkage disequilibrium interval haplotyping analyses, two fiber micronaire-related haplotype blocks are detected, one of which (FM2) is introgressed from G. hirsutum. Seven distinguished traits related to growth period, plant architecture, and stronger vegetative growth habit are found to have pleiotropic effects controlled by a single gene in G. barbadense. Thus, this study provides new insights into the breeding history of G. barbadense and highlights introgression is a driver for improving cultivars in G. barbadense.