Pathogenic and molecular variability in bean common mosaic virus infecting common bean in India.

Pathogenic variability studies in bean common mosaic virus (BCMV) infecting common bean (Phaseolus vulgaris L.) revealed the existence of two pathogroups PG-I and PG-II and four strains (NL-1, NL-1n, NL-7 and NL-7n) in Himachal Pradesh, a North-Western Himalayan state of India. Two strains, NL-1 and NL-7 were identical to the previously described NL-1 and NL-7 strains from Europe and USA, whereas the other two designated as NL-1n and NL-7n differed from earlier identified strains with respect to their necrotic reaction on cultivar Jubila at high temperature (4308C). Reverse phase HPLC peptide profiling of tryptic digests of coat protein of these strains further confirmed that NL-1, NL-1n, NL-7 and NL-7n are distinct from each other. This study constitutes the first record of pathogenic variability in BCMV infecting common bean in India. [ABSTRACT FROM AUTHOR]