Six genotypes as lines and two genotypes as testers of ricebean were studies in line x tester analysis. The study revealed that the gene action involved in controlling characters namely, days to flowering, days to maturity, plant height, branches per plant, pods per plant, clusters per plant, pods per cluster, seeds per pod and yield per plant was nonadditive gene action while two traits namely, 100-seed weight and pod length was under the control of additive gene action. | Combining ability studies for earliness and determinate trait in genetically diverse lines of ricebean [Vigna umbellata (Thunb.) Ohwi and Ohashi]