Abstract
New rice varieties could be released by various plant breeding methods including mutation induction using gamma rays irradiation. Radiosensitivity and LD50 values (Lethal Dose, 50%) can be determined from the morphological response of plants to irradiation treatment in M1 generation. The research aims to determine the value of LD50 and the performance of rice mutant traits of Mira-1 and Bestari. The experiment was conducted using the Randomized Complete Block Design (RCBD) with two factors (rice varieties and gamma irradiation doses) and three replications. The plant traits observed were the percentage of germination, seedling height, and root length in the seedling phase. The results showed that LD50 values in the Mira-1 and Bestari varieties differed in all observed characters. The optimum dose to induce rice mutation of the varieties under investigation is within the range of 521.40 – 663.68 Gy.
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