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21 blackgram genotypes, including the infector ‘Co 5’, were raised in a Completely Randomized Block design with two replications for two consecutive years (2018 and 2019) to screen blackgram yellow mosaic virus (MYMV) disease resistance under field conditions. Two genotypes viz., NDU 1 and Co 5 were highly susceptible to MYMV having PDI > 40% while other genotypes were resistant with PDI up to 10%. In general, genotypes with higher PDI (> 40%) had a lower number of pods per plant (NPP) and vice versa. The average number of susceptible genotypes pods per plant showed 23.75% reduction in number of pods per plant compared with resistant genotypes. These genotypes have undergone multivariate analysis including genetic variability, correlation, divergence and principal component analysis for eleven biometric traits. Principal component analysis revealed significant variation among traits with the first three principal components explaining approximately 74% of the total variation. Seed yield per plant; days to 50% flowering and percent disease index are important traits determining most of the variation. Mash 338, R3/12, R3/28 and PU 31 are the promising blackgram genotypes identified in the present study. These genotypes will be used to develop high yielding MYMV resistant blackgram varieties having other desirable yield traits.
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The authors are grateful to Banaras Hindu University, Varanasi, India for providing the experimental materials and technical support. In addition, the first author is highly thankful to the UGC for providing financial aid for the Ph.D. program.