Induced mutagenesis for earliness in groundnut (Arachis hypogaea L.)
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Date
1987
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Department of Plant Breeding and Genetics, College of Agriculture, Vellayani
Abstract
A research programme was carried out to induce earliness in the promising groundnut variety EC.119704 by irradiating uniformly dried kernels witlri gamma rays at five doses viz., 10, 20, 30, 40 and 50 krads. In the M-| generation, germination, survival, plant height and pollen fertility were estimated. In the M 2 generation, studies on chlorophyll mutations (frequency, spectrum and segregation ratio), viable mutations (frequency and spectrum) and economic mutants were carried out. Mutagenic effectiveness and efficiency were also estimated. Germination and survival in the generation were found to decrease with Increasing doses. But the lowest dose of 10 krad stimulated germination and the higher doses retarded germination. The length of root and shoot decreased with increasing dose. The inhibition of root was more pronounced. Plant height recorded on 15th, 30th and 45th days was found to decrease with increasing doses. Pollen fertility showed an inverse relationship with the dose of gamma rays. Chlorophyll chimeras and morphological abnormalities were also observed.
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PG
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