Molecular markers provide facilities in order to study genetic diversity and relationship among genotypes. In this study, genetic diversity among 35 genotype of Brassica sp. (belonging B. napus, B. juncea, B. rapa, B. nigra) were determined using 13 ISSR, 3 IRAP markers and 18 REMAP (primer combinations of ISSR and retrotransposon primer). The percentage of polymorphism for ISSR, IRAP and REMAP was 96.38, 94 and 96%, respectively. By comparison between markers, ISSRs indicated the highest expected heterozygosity (He) and Shannon’s information index (I) with value of 0.34 and 0.51, respectively, while REMAP marker had by far the highest number of polymorphic bands (340) and marker index (7.1) among all fragments scored over all markers. In pattern of clustering based on Bayesian methods, K = 8 was resulted for combined data clustering that was more organized clustering for genotypes compared to others. This research suggests the combined data of ISSR, IRAP and REMAP markers are most reliable than each solely marker whilst have been clustered genotypes in their taxonomic classification of Brassica without any mixture. Principle coordinate analysis (PCoA) separated 35 genotypes in four groups which all of genotypes were clustered correctly based on their taxonomic classification. The findings of this study provide the valuable insight into the Brassica species relationships in terms of similarity among genotypes which can be helpful in breeding programs, and also demonstrate that retrotransposon markers are legible for genetic diversity and next genetic analysis in Brassica genus.
Russian Journal of Genetics – Springer Journals
Published: Dec 28, 2016
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