Gamma ray induced morphological mutations in non-Basmati aromatic rice

Induction of various types of chlorophyll and morphological mutations by three doses (250, 350 and 450 Gy) of gamma rays in two genotypes, developed from Gobindabhog and Tulaipanja was studied. Segregation of chlorophyll and morphological mutants in M2 generation from normal looking M1 plants 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 450 Gy. Among different chlorophyll mutations albina was the most predominant group. In general, higher mutagenic effectiveness and mutagenic efficiency were found at 450 Gy. 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.

Author : N.R. Chakraborty and P.C. Kole