关键词:棉花; 机采相关性状; 关联分析; 等位变异 Association Analysis and Exploration of Elite Alleles of Mechanical Harvest- Related Traits with SSR Markers in Upland Cotton Cultivars ( Gossypium hirsutum L .) WANG Juan1,**, DONG Cheng-Guang1,2,**, LIU Li1, KONG Xian-Hui1, WANG Xu-Wen1, YU Yu1,* 1Cotton research Institute, Xinjiang Academy of Agricultural and Reclamation Science / Key Laboratory of China Northwestern Inland Region, Ministry of Agriculture, Shihezi 832000, China
2College of Agriculture, Xinjiang Agricultural University, Urumqi 830052, China
Fund:This study was supported by the Doctorial Found of Xinjiang Production and Construction Corps (2013BB001), the Key S&T Projects of; Xinjiang Production and Construction Corps (2016AA001-1), and the National Natural Science Foundation of China (31260340). AbstractCotton suitable for mechanical harvest should have higher requirement in traits, for example, shorter growth period, ideal plant type and high sensitivity to defoliant. A total of 214 pairs of SSR with high polymorphism and uniform distribution on whole genome were used to scan polymorphism in 118 cotton varieties with one or more mechanical harvest-related traits. Molecular marker data and six phenotypic traits were analyzed by the method of MLM (mixed linear model) in Tassel 5.0 on the basis of population structure, analysis loci with elite allelic variation and typical materials carrying elite alleles were identified based on phenotypic effect values. We detected 460 alleles and 905 genotypes. The average genetic diversity index was 0.5151, and the average polymorphic information content (PIC) per marker was 0.4587. Ninety-nine markers achieved the aforementioned average values accounted for 46.3% of the total markers, shows that the SSR markers have more allelic variance and higher genetic diversity. All the 118 cotton varieties were divided into four subgroups by analysis of population genetic structure. There was no corresponding relation between each kind of group of materials and the geographical source. A total of 124 loci ( P<0.05) and 20 loci ( P<0.01) associated with mechanical harvest-related traits were detected by association analysis, with explained variance ranging from 2.23% to 14.15% and from 4.84% to 14.15% respectively. Based on the results of this study, we identified 11 typical materials, including Xi 7, Jinken 9, Y11, Yumian 18, AY-4, K2, Chaoyang 2, DZ22, Zhongmiansuo 43, C2, and Guanrongchangzao B14. The elite alleles and resources can be useful for marker-assisted selection breeding.
Keyword:Cotton; Mechanical harvest-related traits; Associate on analysis; Allelic variation Show Figures Show Figures
图1 2013-2014年在石河子和库尔勒6个表型性状的Boxplot图(箱图两端表示其性状的极值范围; 点圈表示个别极值; 中间直线表示性状中位数。BJ2013、NJ2013、BJ2014、NJ2014分别代表北疆2013 (石河子2013年环境)、南疆2013 (库尔勒2013年环境)、北疆2014 (石河子2014年环境)、南疆2014 (库尔勒2014年环境)。)Fig. 1 Boxplot of six phenotypic traits in Shihezi and Kuerle from 2013 to 2014(Both ends of boxplot indicate the extreme range of traits; the circles of both ends of boxplot indicate single maximum and minimum values; the lines in the middle of boxplot indicate median. BJ2013, NJ2013, BJ2014, and NJ2014 represent Shihezi 2013 environment, Korla 2013 environment, Shihezi 2014 environment, and Korla 2014 environment, respectively.)
图2 118份材料的基于群体结构分析的K值与ln P(D)值和∆ K值变化图(A: K值与ln P(D)值的变化图; B: K值与∆ K值的变化图。)Fig. 2 ln P(D) and ∆ K based on population structure analysis for 118 upland cotton varieties(A: magnitude of ln P(D) as a function of K; B: magnitude of ∆ K as a function of K.)
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