数字农科院2.0

Genetic diversity and population structure analysis of upland cotton (Gossypium hirsutum L.) germplasm in China based on SSR markers

文献类型： 外文期刊

作者： Shi, Jianbin;Zhang, Yibin;Wang, Ning;Xu, Qinghua;Huo, Feichao;Liu, Xiaohong;Yan, Gentu

作者机构：

关键词： Germplasm resources;Molecular markers;Cluster analysis;Genetic relationship

期刊名称： GENETIC RESOURCES AND CROP EVOLUTION

ISSN： 0925-9864

年卷期： 2023 年

页码：

收录情况： SCIE（2023版）

摘要： To reveal the genetic diversity and population structure of upland cotton germplasms distributed in China, molecular marker research was carried out on 191 upland cotton germplasm resources by using 26 simple sequence repeat (SSR) markers to analyse polymorphism and population structure. A total of 92 clearly identifiable bands were amplified from 65 SSR markers, with an average of 3.54 per marker. The mean number of observed alleles (Na) was 1.984, the effective allele number (Ne) was 1.534, the gene diversity index (h) was 0.312, the Shannon-Weaver index (I) was 0.470, and the polymorphism information content (PIC) of the primers was 0.530. Cluster analysis divided the germplasm into 11 groups at a genetic distance of 0.52, and group 1 was divided into 6 subgroups at a genetic distance of 0.39. The germplasms from different regions were interspersed among the various groups, indicating that the germplasm resources within cotton regions were also quite different. All materials were divided into three populations by structure analysis, and there was gene exchange between the three groups, thereby indicating that the resource utilization scope was relatively narrow and that the genetic basis of cultivars was relatively low in breeding units for a long time. The above results showed that the DNA clustering of upland cotton germplasm was not related to its geographical origin but to its genetic relationships, thus indicating the genetic diversity and complexity of cotton germplasm. The results lay a foundation and provide a reference for directional breeding in cotton.

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