Genetics of resistance to yellow mosaic virus (YMV) disease in blackgram [Vigna mungo (L.) Hepper]

摘要

Yellow mosaic virus (YMV) causes one of the most severe of biotic stresses in Vignas, an important group of pulse crops. The viral disease is transmitted through the white fly, Bemicia tabaci, and the yield of the plant is affected drastically. YMV resistant genotype PU-31 was identified in the field within a large population of susceptible genotype lines. PU-31 was crossed with LBG-402, LBG-645 and LBG-685 and raised F,, F2 and F3 progenies. The different generations were phenotyped for YMV-reaction. Resistance to YMV disease governed by two dominant genes acting in complementary fashion, YMV-resistance was revealed from F2 segregation ratio of 9 : 7 (Resistant : Susceptible), which was confirmed by the segregation ratio of the F3 families. This isthe first report of YMV-resistance controlled by only complimentary gene action.