The main purpose for mutation induction in rice crop, is to increase the mutation frequency rate in a short period of time, in developing new plant varieties with useful agronomical traits in order for sustainable food production to become a possibility. Exploitation of spontaneous mutation frequency rate is veryboth rare and exceptional, being difficult to exploit by the plant breeders. Commonly, mutations are induced by chemical (e.g. ethyl methane sulfonate) and physical (e.g. gamma radiation) mutagen treatment of both seed and vegetatively propagated crops. Here, over 10,000 seeds of rice variety Gohar were initially subjected to mutagenesis, using ethyl methane sulfonate (EMS). The EMS-treated seeds were rinsed with deionized water and then sown in the seedbed. A population of about 5250 M1 plants was developed. At maturity, a single panicle (one ripening panicle) was picked from each plant. The Nextfollowing year, to achieve 3510 M2 plants, the seedlings selected from the nursery grown panicles were grown in the field. Then, one panicle was chosen from each mature plant in M2 to get the M3 population. In the M4 population, the selection criteria were early maturity, high-fertility rate, dwarf growth habit and plant type. Eventually, six plants possessing early maturing trait were selected for commercial release.
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