The structure of genetic diversity in cotton as revealed by microsatellite markers

Working group session: 
Germplasm and Genetic Stocks
Presentation type: 
poster
Authors: 
Tyagi, Priyanka ; Kuraparthy, Vasu; Gore, Michael ; Bowman, Daryl
Presenter: 
Tyagi, Priyanka
Correspondent: 
Tyagi, Priyanka
Abstract: 
Cultivated upland cotton germplasm was derived from a small number of ancestral cottons and therefore has narrow genetic base. Establishing the genetic diversity is essential for the germplasm enhancement, and genomic analysis in cotton. With a goal to sample the upland cotton genetic diversity and to utilize it in mapping and genomic selection in cotton improvement programs we genotyped the upland cotton germplasm. We characterized genetic relationships of 384 upland cotton cultivars, representing breeding programs from across the U.S. cotton belt. Genotyping was done using high-resolution capillary-based SSR genotyping. SSR marker sequences were obtained from Cotton Marker Database and a minimum of four markers per chromosome were selected. The structure of genetic diversity of upland cultivars in the form of phylogenetic tree and the genetic relationships of the cotton cultivars using marker data will be presented.