Cotton is an important cash crop and natural raw material for the textile industry.Cultivar is a major restrictive factor for cotton production,which depends on the identification,evaluation,and effective utilization of elite germplasms.In view of this,141 modern cotton cultivars derived from the three major cotton-growing regions(the Yellow River valley,the Yangtze River valley,and the Northwest Inland cotton-growing areas)in China were used in the present study,and four yield and five fiber qua-lity traits of these varieties were evaluated under different environments.The genetic diversity of these varieties based on KASP and SSR markers was also analyzed.The results showed that the varieties from the Yangtze River valley presented the highest lint percentage and lint index,the varieties from the Yellow River valley displayed the highest boll weight and seed index,while the varieties from the Northwest Inland cotton-growing areas possessed the best fiber quality traits.The analysis of variance showed that the yield and fiber quality traits were significant different among cotton varieties.The coefficient of variation(CV)of lint index was the largest(10.09％)in the yield traits while the CV of fiber strength was the largest(8.81％)in the fiber quality traits,indicating a great improvement potential in these two traits.The clustering result based on phenotypic traits showed that 141 va-rieties were divided into two groups with different yield and fiber quality traits.Meanwhile,a total of 74 polymorphic binds were amplified by 30 pairs of SSR primers,and 32 KASP markers were clearly classified among the tested varieties.Based on SSR and KASP markers,the average value of genetic similarity coefficient was 0.62,indicating a high genetic diversity in these cotton varieties.The clustering results based on molecular markers showed that 141 varieties were also divided into two groups,which indicating some consistent with the cluster result based on phenotypic traits.Moreover,three elite germplasms with high boll weight(＞7 g),24 elite germplasms with high lint percentage(＞42％),six elite germplasms with high fiber length and strength(＞30),and two germplasms with multiple elite yield and fiber quality traits were screened out,which provides elite parents for developing new cotton varieties and theoretical basis for the further utilization of these germplasms.
关键词
棉花/种质资源/产量和纤维品质/分子标记/遗传多样性
Key words
cotton/germplasms/yield and fiber quality/molecular marker/genetic diversity
维普
万方数据