Evaluation of Some Bread Wheat Genotypes in the Reproductive Stage under Pattern Chilling Stress

Plants are usually exposed to a range of environmental stresses. These stresses have undesirable effects on survival create growth, quantity and quality of agriculture products. Chilling stress is one of them that can damage cereals at the reproductive stage. The aim of present study was investigation of chilling effects on physiological traits, plant pigments (total, a and b chlorophyll and Carotenoid), proline content and ion leakage at reproductive stage under artificial conditions. To reach to this aim na experiment with 20 bread wheat cultivars with four levels of chilling stress ( (control), , 0, -2 Celsius) using factorial arrangement based on a completely randomized design was implemented. Results of variance analysis showed that cold levels, cultivars and effects of interaction signification at the 1% level. Comparison of means effects of interaction showed that the tolerant cultivars have little cell membrane leakage and more plant pigments and proline content at different levels of artificial chilling stress. Oroom and Aflak were known as the most tolerant cultivars and Line A and Mv17 as the most susceptible cultivars According to these criteria. Totally, this research showed that ion leakage, plant pigments and proline content can suitable traits for assessment of chilling stress.