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Genetic instability in rice

Genetic instability in rice

Journal of Genetics & Breeding 46(3): 247-251

Genetic instability in rice has been observed in a rice mutant, induced after Nitroso-methyl urea + hydrazine treatment. Red mottling on bronze coloured kernels and developmental variants like notched grain, male steriles, dwarf plant type, altered grain shape, altered flag leaf length and area, were observed in M3, M4, M5 and M6 generations suggesting instability. Variable degree of expression of kernel mottling and new kernel phenotypes, red and bronze, were observed in the M5 generation raised from M4 mottled plant. The mottling pattern of M5 seeds had no influence on the M6 plant progenies. Also irrespective of the phenotypes, red, bronze and bronze mottled in the M5 generation, bronze mottled progenies were observed predominantly in the M6, whereas white M5 seeds gave mostly white seeded M6 progeny. The cross of instable bronze mottled line with that of white line gave bronze and bronze mottled F1s, and in F2 generation, segregation for coloured VS colourless (white) varied from progeny to progeny (4.46:1 - 7.41:1) and did not conform to normal genetic ratios. A transposable element system is suspected in this mutant possibly due to the mutational activation of a silent element present in the rice genome.

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Accession: 002390976

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