Studies on gene action for yield and its components in urdbean [Vigna mungo (L) Hepper]

An investigation was conducted in blackgram to estimate the components of genetic variance for yield and related characters using NCD-II. The additive genetic variance (σ²A) was higher than the dominance genetic variance (σ²D) for all the characters studied. Days to maturity, plant height clusters per plant, pods per plant and grain yield were governed by both additive and nonaddihve gene action. Biparental intermating may be suggested for exploiting both types of genetic variances.