Abstract: Genetic diversity of different cotton lines was evaluated by SSR. The genomic DNAs of 46 lines were amplified with 9 SSR primer pairs,which yielded 39 polymorphic bands. The classification of the cotton lines using the Unweighted Pair 2 group Method with Arithmetic Average based on the pair similarity coefficient,the result indicated that 46 cotton lines have been classed in 2 types,when the pair similarity coefficient was 0. 33. Type I was Sea Island cotton,and type II was upland cotton. In type II,when the pair similarity coefficient was 0. 568,upland cotton lines have been classed in 2 groups. Group I was lines with more comprehensive features of the Sea Island cotton and upland cotton. From DNA polymorphic bands,we found mostly bands of this type cotton lines were hybrid between the Sea Island cotton and upland cotton,and have some Sea Island cotton bands. In Group II,except JI031823 and JI04425 were pure upland cotton,others were introgressed lines from interspecific hybridization of G. hirsutums and G. barbadense. These introgressed lines have been classed in different sub-groups for introgressed loci were different.The study provides a preliminary theoretical foundation for the use of these lines and the parents choose for new hybrids varieties.

Key words: Cotton, Molecular marker, Genetic diversity, Cluster analysis

CLC Number: 

• S562.03