Effect of Yellow Mosaic Disease on Gas exchange parameters of Blackgram (Vigna mungo L. Hepper)

A field experiment was conducted during Kharif 2018 at Botanical Garden of Acharya Nagarjuna University to determine the effect of Yellow mosaic virus infection on photosynthetic and yield attributes of Blackgram (Vigna mungo L.. Hepper). A total of fifty blackgram varieties were obtained from Regional Agricultural Research Station, Lam, Guntur, Andhra Pradesh. The obtained blackgram varieties were cultivated and left to infection of YMV. The data was collected on chlorophyll content, SCMR, photosynthetic rate, stomatal conductance, transpiration and yield per hectare. Of all the varieties Ku-15-9, TU-18 and PGRU-99-028 recorded high chlorophyll content coupled with high SCMR content and photosynthetic activity. Varieties Ku-15-9, TU-18 and PGRU-99-028 also reported high yield content per hectare 1685.45 q/h, 1595.00 q/h and 1280.00 q/h respectively. Based on the performance of the all the varieties, varieties Ku-15-9, TU-18 and PGRU-99-028 should be considered as resistant to yellow mosaic disease.