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Genetic structure,gene flow pattern,and association analysis of superior germplasm resources in domesticated upland cotton(Gossypium hirsutum L.)

引用

Plant Diversity 2020年第3期42卷 189-197页

作者： Ting-Ting Zhang Na-Yao Zhang Wei Li Xiao-Jian Zhou Xiao-Yu Pei Yan-Gai Liu Zhong-Ying Ren Kun-Lun He Wen-Sheng Zhang Ke-Hai Zhou Fei Zhang Xiong-Feng Ma Dai-Gang Yang Zhong-Hu Li Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationCollege of Life SciencesNorthwest UniversityXi'an710069China State Key Laboratory of cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyang455000China

Gene flow patterns and the genetic structure of domesticated crops like cotton are not well ***,marker-assisted breeding of cotton has lagged far behind that of other major crops because the loci associated with cotton traits such as fiber yield and quality have scarcely been *** this study,we used 19 microsatellites to first determine the population genetic structure and patterns of gene flow of superior germplasm resources in upland *** then used association analysis to identify which markers were associated with 15 agronomic traits(including ten yield and five fiber quality traits).The results showed that the upland cotton accessions have low levels of genetic diversity(polymorphism information content=0.427),although extensive gene flow occurred among different ecological and geographic *** clustering analysis indicated that the cotton resources used in this study did not belong to obvious geographic populations,which may be the consequence of a single source of domestication followed by frequent genetic introgression mediated by human transference.A total of 82 maker-trait associations were examined in association analysis and the related ratios for phenotypic variations ranged from 3.04% to 47.14%.Interestingly,nine SSR markers were detected in more than one environmental *** addition,14 SSR markers were co-associated with two or more different *** was noteworthy that NAU4860 and NAU5077 markers detected at least in two environments were simultaneously associated with three fiber quality traits(uniformity index,specific breaking strength and micronaire value).In conclusion,these findings provide new insights into the population structure and genetic exchange pattern of cultivated cotton *** quantitative trait loci of domesticated cotton identified will also be very useful for improvement of yield and fiber quality of cotton in molecular breeding programs.

关键词： domestication cotton Fiber quality traits Genetic exchange Microsatellite markers Yield

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