Genetic Diversity of Diploid and Tetraploid Cottons Determined by SSR Markers

GENETIC DIVERSITY OF DIPLOID AND TETRAPLOID COTTONS DETERMINED BY SSR MARKERS This study aimed to determine genetic diversity for diploid and tetraploid cotton genotypes and to use its relationship with fiber quality parameters to identify molecular markers that might be used in plant breeding. Fiber analysis showed significant differences among all the genotypes. Askabat 91 and Bahar 82 genotypes belonging to G. barbadense L. were found to be different from the genotypes belonging to G. hirsutum L. for fiber quality traits. SSR (Simple Sequence Repeats) markers were used to determine genetic relationship among the genotypes. Genetic diversity was ranged from 6 to 73 % among all the genotypes inspected. This ratio was 6-34 % within G. hirsutum L. and 12-42 % within G. barbadense L. species. Out of these two species, genetic diversity was ranged from 12 to 73 % among the other diploid and tetraploid species.