Inheritance of resistance to Yellow Mosaic Virus (YMV) was studied in crosses of mungbean, blackgram and their interspecific crosses with Vigna sublobata. Resistance to YMV was recessive in the three Vigna species. The segregation ratios in F2 and back crosses indicated that the resistance was digenic recessive in the crosses of mungbean and in interspecific crosses of mungbean with blackgram and Vigna sublobata but YMV resistance was monogenic recessive in blackgram crosses.

Genetics of fertility restoration 2 in six varieties and breeding lines of rice was studied in 'Wild Abortive' cytoplasmic genetic male sterility system using cytoplasmic male sterile lines V 20 A and IR 54752 A. Fertility evaluation of the plants in F2 and testcross populations of the crosses of V 20 A with PR 103, PR 106 and PAU 502-94-1, and IR 54752 A with PAU 1124-36-1 and PAU 1126-1-1 revealed that fertility restoration in PR 103, PR 106, PAU 502-94-1, PAU 1124-36-1 and PAU 1126-1-1 was controlled by two independently segregating dominant genes. The two genes appeared to have additive effects; one of them being stronger than the other in imparting fertility restoration. Data on spikelet fertility of the plants in F2 and testcross populations of V 20 A/UPR 82-1-1 cross showed that fertility restoration in UPR 82-1-1 was controlled by two independently segregating dominant genes which exhibited recessive epistatic interaction.

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