The mutagenic effects of gamma-rays in inducing mutations in cotton was studied with particular referen ce to micro-mutations.The varieties MCU 4 and MCU 5 (G.hirsutum)were treated with gamma-rays at doses ranging from 5 Kr.to40Kr.inthe M1.reduction in plant.height ,yield,mean number of boils per plant.- seed index and lint index were observed due to radiation injury.in M2 an increased variability for these quantitative characters was observed.Asignificant difference between lines in a family with a positive shift in some line for charaters under study was also recorded.The induction of micromutations.- their detection and possible exploitation are discussed in this paper.
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