Morphological and Biochemical Factors Associated with Blackgram Resistance to Whitefly, Bemisia tabaci and Yellow Mosaic Disease

Background: Yellow Mosaic disease caused by Mungbean yellow mosaic virus (MYMV) is one of the most destructive biotic production constraints in blackgram, responsible for yield losses up to 100 per cent. It is transmitted by whitefly in persistent circulative manner. The host plant resistance has a great importance in MYMV resistance. Morphological and Biochemical characters play a key role in offering resistance to vector and MYMV in the resistant genotypes. Methods: The Experiment was conducted under glass house conditions using ten blackgram genotypes showed differential reaction to yellow mosaic disease during preliminary field screening. Experiment was laid out completely randomized block deign, replicated thrice. Result: The results revealed that among the selected genotypes, resistant genotypes (GBG-1 and VBN-7) was recorded the maximum leaf thickness, maximum trichome density with shortest trichome length, maximum total phenolics, total proteins and total amino acids than the remaining genotypes which contributes resistance behavior in the host. Hence it concluded morphological factors are found responsible for vector preference for feeding where as biochemical parameters are crucial for virus infection and multiplication.