Genetic diversity and species relationships among 9 species of Vigna (V. aconitifolia, V. adenantha, V. mungo, V. pilosa, V. radiata, V. sublobata, V. trilobata, V. umbellata and V. unguiculata) with 29 accessions collected from Odisha, Andhra Pradesh and Assam were analysed using 11 RAPD and 16 ISSR markers. A total of 2426 fragments were amplified with both the primer sets, of which 2368 bands were of polymorphic nature. Eighteen unique bands and 58 monomorphic bands were also detected. In the present study, clustering of species in the dendrograms constructed using RAPD, ISSR and combined data was not in complete agreement with the intra-generic classification of Verdcourt (1970) as modified by Marechal et al. (1978) but certain species followed the pattern of species placement stated there in. Vigna sublobata, considered as a variety of V. radiata by many is established here as a distinct species. The phylogenetic tree generated from combined RAPD and ISSR data revealed segregation of taxa into two distinct clusters, one with Vigna radiata-Vigna mungo belonging to the sect. Ceratotropis of the subgenus Ceratotropis along with V. unguiculata of the sect. Vigna of subgenus Vigna; and the other with members of sect. Leptospron of subgenus Sigmoidotropis and sect. Angulares and sect. Aconitifoliae of the subgenus Ceratotropis. The necessity to reinvestigate the sectional classification of the sub-genus Ceratotropis of genus Vigna has been suggested.
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