Genetic study for earliness in cowpea (Vigna unguiculata L. Walp.)

摘要

Line x Tester (10 x 3) analysis of F_1 generation in cowpea expressed highly significant differences among parents and hybrid for days to 50% flowering and days to 1st green pod picking. The cross combination Black Seeded x Pusa Komal showed maximum negative heterosis over better parent and mid parent, whereas Kala Zamala X Cowpea-263 was better over standard parent for days to 50% flowering. The crosses, Ramnagar Kala x Arka Garima, Red Seeded x Arka Garima and Red Seeded x Cowpea-263 showed maximumnegative heterosis over better parent, mid parent and standard parent, respectively for days to Ist green pod picking. The variance due to general combining ability and specific combining ability were highly significant denoting importance of additive and non-additive gene action for both the traits. Additive genetic variance was predominant for days to 50% flowering whereas non-additive genetic variance governs days to Ist green pod picking. The parents NDCP-13, Kala Zamala, Red Seeded, Black Seeded,RCV-7, Cowpea-263 and Pusa Komal were good general combiners for both the traits. The crosses Sel. 2-2 x Pusa Komal, Cowpea Local x Arka Garima and Sel. 2-1 x Arka Garima were identified as best specific combiners for days to 50% flowering whereas crosses Sel. 2-2 x Pusa Komal, Cowpea Local x Arka Garima and Red Seeded x Arka Garima were good for days to Ist green pod picking.