Paper Title
In Vitro Testing The Resistance To Drought Stress Of Rice (Oryza Sativa L.) Mutant Resulted From Gamma Rays Irradiation

Abstract
The This study aims to test the resistance of mutant rice resulting from gamma ray irradiation to drought stress by in vitro method. The results showed that the genotype effected very significant on the parameters of growth rate, seedling weight and normal strength of strong seedling, vigor index and the simultaneous growth. While the parameters of maximum growth potential and germination did not find any significant difference. The result showed that the genotype of Unsyiah 5 had the highest percentage value on all parameters of viability and vigor of seed as well as on both parameters of seedling weight followed by Unsyiah 4 and Unsyiah 1. The treatment of PEG-6000 showed a very significant effect on seed viability. Concentrations at the PEG-6000 level of 10% showed a marked difference with the 5% level and control. Both the percentage of germination and the lowest germination were found at a 10% PEG-6000 concentration. There is a very real interaction between rice genotype and PEG-6000 concentration on vigor index. While the real interaction was obtained on the parameters of maximum growth potential. The results showed that with increasing PEG concentration it will decrease the percentage on all germination parameters. The higher concentration of PEG fed will be directly proportional to the reduced percentage of maximum growth potential. There is a difference in the response given by each genotype due to different PEG-6000 concentrations resulting in rice resistance in drought stress conditions. Keywords: In Vitro, Mutation, Rice, Mutant, Gamma, Drought Stress