Genetic diversity within and among two-spotted spider mite resistant and susceptible common bean genotypes
Zeinab YOUSEFI | Zahra TAHMASEBI | Mohammad Javad Erfani MOGHADAM | Ali ARMINIAN
Two-spotted spider mite (Tetranychus urticae C. L. Koch, 1836), is one of the most destructive herbivores of common bean. Very little is known about the diversity among resistant sources in this crop. The present study was conducted to characterize 22 resistant and susceptible common bean genotypes by 8 Simple Sequence Repeats (SSRs) and 8 Random Amplified Polymorphic DNA (RAPD) markers. These SSR and RAPD primers produced 100 % and 81.8 % polymorphic bands. Based on RAPD fingerprints and SSR profiles, pairwise genetic similarity ranged from 0.0 to 0.857 and from 0.125 to 1, respectively. The resistant and susceptible common bean accessions were grouped together in the dendrograms generated from RAPD and SSR clustering analyses. The results indicate that RAPD and SSR analysis could be successfully used for the estimation of genetic diversity among genotypes. SSR markers could group genotypes according to their resistibility and susceptibility to the spotted spider mite but RAPD could not. Therefore, the SSR markers can facilitate the development of resistant common bean cultivars through breeding programs against T. urticae.
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