Effect of of vegetative growth, cell membranes stability and ion compartmentation of rice genotypes under salt stress condition

This research carried out to evaluate responses of rice genotypes and cultivars to salt stress using a factorial experiment with complete block randomized design in three replications, in Dankook University, South Korea at 2012.First factor was 16 rice genotypes and cultivars at vegetable growth stage and second factor was soil salinity levels (0.8 ds m-1 as control and 6.2 ds m-2 ). Salt stress disturbed cell membrane and the highest malondealdehid obtained from Khazar, Kadus, Baekjimju byeo, Chucheomg byeo, Shimdomgjim byeo cultivars and IR29 and IR59418-7B-21-3 genotypes. The highest shoot dry weight showed in IR67075-2B-5-2 genotype (153.8 g m-2), Kochihibic (152.2 g m-2), Haraz (149.8 g m-2), Shafagh (152.0 g m-2) and Nemat (156.9 g m-2). These cultivars have maximum Kﳖ rate, antioxidant enzymes activates, relative water cotent, soluble carbohydrate and photosynthesis rate and minimum leaf Na concentration. Leaf K/Na ratio, relative water content, photosynthesis rate dry matter and malondealdehid concentration suggest for choice salt tolerance rice cultivar in vegetable stage.