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.
