Genetic diversity and evolution of the plastome in allotetraploid cotton (Gossypium spp.)

文献类型： 外文期刊

第一作者： Yan, Xin-Lin

作者： Yan, Xin-Lin;Yuan, Dao-Jun;Wu, Zhi-Qiang;Yan, Xin-Lin;Kan, Sheng-Long;Li, Yong-Yao;He, Wen-Chuang;Nie, Li-Yun;Hu, Guan-Jing;Wu, Zhi-Qiang;Kan, Sheng-Long;Wang, Mei-Xia;Tembrock, Luke R.;Hu, Guan-Jing;Ma, Xiong-Feng;Yuan, Dao-Jun;Yuan, Dao-Jun

作者机构：

关键词： crop wild relatives; G. barbadense; G. hirsutum; pan-plastome; polyploidy

期刊名称：JOURNAL OF SYSTEMATICS AND EVOLUTION （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN： 1674-4918

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Cotton (Gossypium spp.) is a vital global source of renewable fiber and ranks among the world's most important cash crops. While extensive nuclear genomic data of Gossypium has been explored, the organellar genomic resources of allotetraploid cotton, remain largely untapped at the population level. The plastid genome (plastome) is well suited for studying plant species relationships and diversity due to its nonrecombinant uniparental inheritance. Here, we conducted de novo assembly of 336 Gossypium plastomes, mainly from domesticated cultivars, and generated a pan-plastome level resource for population structure and genetic diversity analyses. The assembled plastomes exhibited a typical quadripartite structure and varied in length from 160 103 to 160 597 bp. At the species level, seven allotetraploid species were resolved into three clades, where Gossypium tomentosum and Gossypium mustelinum formed an early diverging clade rooted by diploids, followed by splitting two sister clades of Gossypium darwinii-Gossypium barbadense and Gossypium hirsutum-Gossypium ekmanianum-Gossypium stephensii. Within the G. hirsutum clade the resolution of cultivated accessions was less polyphyletic with landrace and wild accessions than in G. barbadense suggesting some selection on plastome in the domestication of this adaptable species of cotton. The nucleotide diversity of G. hirsutum was higher than that of G. barbadense. We specifically compared the plastomes of G. hirsutum and G. barbadense to find mutational hotspots within each species as potential molecular markers. These findings contribute a valuable resource for exploring cotton evolution as well as in the breeding of new cotton cultivars and the preservation of wild and cultivated germplasm.

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