Effect of winter cold on membrane stability, chlorophyll Content and crown depth in some spring and winter wheat Genotypes in Ardabil Region

Cold is one of the most important abiotic stresses in some regions of Iran. To Investigate of some tolerance related traits to cold condition, 22 bread wheat genotypes planted in Ardabil region in 1980. After plants passed winter cold condition (135 freezing days), cell membrane stability, chlorophyll content of leaf and crown depth and grain yield of genotypes were measured. ANOVA analysis showed significant differences between genotypes for grain yield, cell membrane stability and chlorophyll content of leaf at 5%. While there was none significant differences between genotypes for crown depth. Mean comparison showed that, Aug//gt/…, Navid, C-73-8, sardari and C-70-3 genotypes with 3.52, 3.41, 3.34, 3.26 and 3.24 ton/ha respectively had the highest and 4213 genotype with 1.59 tn/ha had the least grain yield in experiment condition. Correlation coefficients showed negative significant correlation between grain yield and cell membrane Stability, and positive correlation between grain yield and chlorophyll content of leaf. Overall it seems these methods can be used as simple and quick tools for evaluating and screening wheat genotypes in winter cold condition.