Author(s):

Zafar Imam and Nihar Ranjan Chakraborty

Abstract: This experiment was aimed at generate genetic variability in a non-basmati aromatic rice using the most potent physical mutagen i.e. gamma rays. The seeds were irradiated with four different doses of gamma rays viz 250 Gyh^-1, 300 Gyh^-1, 350 Gyh^-1 and 400 Gyh^-1. In M₂ generation, large numbers of morphological mutants were identified. Observations were recorded in each of selected putative mutants in M2 generation. Several viable mutants were observed with respect to plant type, increased tillering, stem colour, grain colour, rapid elongation, complete spikelet sterility, stigma colour, grain type, broom stick appearance, awned grains and early maturing. The plant yield of many mutants were reduced with respect to the parents, the ideotype of the some mutants were good with respect to plant height, the early maturing and double spikelet at mid and tip region of panicle. The gene which is responsible for dwarfism and early maturity in non-basmati aromatic rice can play significant role to develop short stature rice cultivar with retaining original quality.

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