Gamma ray induced morphological mutations in non-Basmati aromatic rice Chakraborty N.R., Kole P.C. Department of Crop Improvement, Horticulture and Agricultural Botany, Institute of Agriculture, Visva-Bharati, Sriniketan-731 236, West Bengal, India Abstract Induction of various types of chlorophyll and morphological mutations by three doses (250, 350 and, 450Gy) of gamma rays in two genotypes, developed from Gobindabhog and Tulaipanja was studied. Segregation of chlorophyll and morphological mutants in M2generation from normal looking M1plants indicated recessive nature of mutations. Frequency of different chlorophyll and morphological mutations was higher in Tulaipanja group. The highest frequency of chlorophyll and morphological mutations was observed in the genotype IET, 14143, developed from Tulaipanja, at, 450Gy. Among different chlorophyll mutations albina was the most predominant group. In general, higher mutagenic effectiveness and mutagenic efficiency were found at, 450Gy. Various morphological mutants like grassy leaf, rolled leaf, striped leaf, and broom stick leaf and several other mutants like sterile, early flowering, late flowering, non-flowering, tall, dwarf, semi-dwarf and high yielding mutants were induced with variable frequencies in different genotypes by different doses of mutagen. The frequency of chlorophyll mutations increased with increase in dose of mutagen but no relationship between the doses of mutagen and mutation spectrum could be established in morphological mutation. Top Keywords aromatic rice, gamma ray, induced mutation, morphology. Top |