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Breeding and inheritance studies in cowpea, Vigna sinensis

Breeding and inheritance studies in cowpea, Vigna sinensis

Journal of the American Society of Agronomy 40(6): 479-489

Breeding work carried out in Bihar, India, for six years to produce an improved cowpea is described. The parents crossed for the purpose were two established varieties, viz., T2 an early-maturing, long-podded sort with distantly spaced seeds, black seedcoat, and green and fibrous pods, and T3 a late-maturing, short-podded variety with closely-spaced seeds, red seedcoat, and green and tender pods. The object was mainly to transfer the genes from T2 responsible for earliness and long pod to T3. During the course of the work, observations were made on the inheritance of certain other characters. The cross was made in 1940 and carried up to F6 in 1945. From the results obtained it was concluded: 1. That with respect to seedcoat color black seedcoat is dominant over red seedcoat, inheritance being monogenic. 2. That maturity ranged from early with first flowering in 49 days to late with first flowering in 94 days. The F1 showed an intermediate condition, tending toward earliness. It is probable that the inheritance of maturity is controlled by two pairs of factors. 3. That fruit length ranged from long, 31 inches to short, 13 inches. The F1 showed an intermediate condition, tending towards small fruit. The typical T2 fruit did not appear in any of the generation studied. It is assumed that more than two pairs or perhaps even more than three pairs of genes may be responsible for fruit length, but no definite conclusion could be reached. 4. That number of seeds per fruit varied from 13 distantly spaced seeds to 16 closely spaced seeds. No conclusions could be arrived at on the inheritance of this character. Detailed observations have been recorded, however, from different generations and selection of desirable hybrids was made in various generations. Five different fixed hybrids combining desirable characters have been established and are briefly described.

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Accession: 013087918

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