Vol. 11, Issue 9 (2022)

Author(s):
D Lakshmi Lavanya, R Latha, M Arumugam Pillai and D Shoba

Abstract:
Blackgram (Vigna mungo L. Hepper) is an important pulse crop widely cultivated in Asian countries like India which is the highest producer of blackgram in the world. It is rich in protein (23g/100 g) content and is more commonly cultivated in South India. The yield of black gram is mainly affected by Mung bean yellow mosaic disease (MYMV) accounting for up to 100% yield loss under severe infection. Hence screening for MYMV resistance and studying the factors responsible for MYMV resistance is essential for the selection of genotypes resistant to MYMV. Secondary metabolites produced by the plants like phenols and tannins are associated with biotic resistance. The present investigation was carried out to study the effect of biochemical factors like tannins and phenols on MYMV disease resistance in black gram. In this study, the RILs developed from the cross ADT3 X KKB 15 052, where, ADT3 is a high yielding but susceptible variety to MYMV and KKB 15 052 is resistant to MYMV were evaluated for MYMV resistance by infector row method and scoring was done by the modified scale of All India Coordinated Research Project on MuLLaRP (Alice and Nadarajan, 2007). Biochemical factors viz. phenol and tannin were estimated by following Folin ciocalteau technique and folin-Denis method respectively. The varieties Co 5 and VBN 8 were used as susceptible and resistant checks respectively. The results showed that the RILs 8-21NH, 7-13, 7-24H, and 8-32H were resistant to MYMV with a resistance score of 0 to 2 and showed high content of tannin and phenols over the susceptible RILs which showed disease rating between 5.1-9.0.