Molecular evidence of an isolate of mungbean yellow mosaic India virus with a recombinant DNA B component occurring on mungbean from mid-hills of Meghalaya, India.

A new isolate (Mg-mungbean-1) of yellow mosaic virus (YMV) was identified and characterized from mungbean growing in mid-hill condition of Meghalaya, India. Full genome of components (DNA A and DNA B; NCBI accessions number KU95030 and KU95031, respectively) of the virus were amplified through rolling circle amplification and sequenced. Both, DNA A and DNA B shared a common region (CR) with 90.4% similarity. The DNA A of Mg-mungbean-1 showed maximum (97.59%) nucleotide identity with mungbean yellow mosaic India virus (MYMIV) isolate (HF922628) reported from West Bengal, India and DNA B showed ~ 96% nucleotide identity with mungbean yellow mosaic virus (MYMV) isolates having variant DNA B. Phylogenetic tree of DNA A also identified Mg-mungbean-1 as a MYMIV. Based on DNA B the current isolate grouped with the variant Indian MYMV isolates. One recombination event in the CR of DNA B of Mg-mungbean-1 was detected, where MYMV:India:clonePB1 and MYMIV:India:cloneMBB-B31 have been identified as major and minor parents, respectively. Overall, the current study indicated occurrence of an isolate of MYMIV with a recombinant DNA B component on mungbean from mid-hills of Meghalaya, India. To the best of our knowledge this is the first molecular characterization of YMV from northeast India.