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Mutation frequency and chlorophyll mutations in parents and hybrid of cowpea following gamma irradiation

John, S.A.

Indian Journal of Genetics and Plant Breeding 59(3): 357-361

1999


ISSN/ISBN: 0019-5200
Accession: 003208657

Gamma rays altering the mutation frequency and chlorophyll mutations in 2 cowpea (Vigna unguiculata) parents (Co 4 and C152) and their F1 hybrid at different doses (0, 30, 40 and 50 kR) were studied. The mutation frequency increased gradually up to moderate doses of gamma rays and the highest frequency rate was found in M1 of Co 4. The frequency was dose dependent. The viridis mutant was more frequent in the total spectrum, while chlorina and xantha were in equal proportions, followed by albina and albo-viridis. The mutagenic effectiveness was higher with high doses in Co 4, and with moderate doses in C152 as well as their hybrid. However, efficiency was greatest when calculated on lethality basis, followed by injury and sterility basis. In cowpea, 50 kR of gamma rays was found to be the most efficient dose.

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