Heterosis and genetic architecture of yield, yield contributing traits and yellow mosaic virus in mungbean [Vigna radiata (L.) Wilczek]**

A diallel analysis in mungbean carried out from a set of 36 genotypes comprising of 8 genotypes and 28 F₁ crosses were sown in randomized block design with three replications. The highest heterobeltiosis of 62.50 per cent was recorded by cross PDM-87 x K851. The crosses PDM-143 x GM3 registered the highest standard heterosis (36.90) for seed yield followed by PDM11 x GM-4 with standard heterosis (30.95). These crosses also showed significant standard heterosis for the component trait like pods per plant and days to 50 % flowering. The cross PDM-143 XPDM-87 noted highest standard heterosis and followed by PDM-143 X PDM-11 for early flowering. The crosses PDM-11 x GM-4, PDM-11 x GM-9918, PDM-143 x GM-9918 and PDM-87 x K-851 manifested relatively high heterobeltiosis, though their mean yields were higher as compared to high x high and low x low crosses. The magnitude of dominance was higher than additive component. In case of days to maturity, branches per plant, seed yield per plant, 100-seed weight, protein content and YMV incidence at least one gene or gene group exhibited dominance. This cross can be used for direct selection in segregating generation for isolation of superior homozygous lines.