Indian Society of Genetics & Plant Breeding

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MUTATION FREQUENCY AND CHLOROPHYLL MUTATIONS IN PARENTS AND HYBRID OF COWPEA FOLLOWING GAMMA IRRADIATION

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Gamma rays altering the mutation frequency and chlorophyll mutations in cowpea
parents and their FI hybrid at different doses were studied. The mutation frequency
increased gradually up to moderate doses of gamma rays and the highest frequency
rate was found in the variety Co 4 on MI plant basis. The frequency was dose
dependent. The mutant viridis was more frequent in the total spectrum, while chlorina
and xantha were in equal proportions, followed by albina and alba-viridis. The
mutagenic effectiveness was higher with high doses in Co 4, and with moderate doses
in C 152 as well as their hybrid. However, efficiency was maximum when calculated
on lethality basis, followed by injury and sterility basis. In cowpea, 50 krad of gamma
rays was found to be the most efficient dose.
 

Keywords: Cowpea, gamma rays, effectiveness, efficiency, mutation frequency

Info

Year: 1999
Volume: 59
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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