ﺑﺮرﺳﻲ ﻧﺸﺖ اﻟﻜﺘﺮوﻟﻴﺖﻫﺎ و ﭘﺮاﻛﺴﻴﺪاﺳﻴﻮن ﻟﻴﭙﻴﺪﻫﺎی ﻏﺸﺎ، ﺷﺎﺧﺼﻲ ﺑﺮای ارزﻳﺎﺑﻲ ﻣﻴﺰان ﺗﺤﻤﻞ ﺑﻪ ﺳﺮﻣﺎی دﻳﺮرس ﺑﻬﺎره در ارﻗﺎم ﮔﻨﺪم ﻧﺎن (Triticum aestivum )

eing an effective way for evaluating late spring low temperature tolerant varieties is important. The cold occurs when low temperatures coincide with sensitive (flowering stage) plant growth stage is called late spring low temperature stress. Therefore, the present research with inducing stress in flowering stage, aims to analysis its effects in common varieties by physiological traits associated with membrane. Stress simulation was performed using Zadoks 50-68 code. Electrolyte leakage and lipid peroxidation were conducted by Bertin, et al. (1996) and De vos, et al (1991), respectively. The variance analysis results of Electrolyte leakage revealed that cold stress levels and variety interaction effect in stress levels had significant effects. Bezostaya and Zare varieties had the highest stability in difference temperature levels than other varieties and Azar2 had the highest instability.The variance analysis results of lipid peroxidation showed that varieties
had significant effects in 1% level and mean compares divided it into two groups. According to the results of the cluster analysis data were divided into four groups that Sabalan and Azar2 in the sensitive group, Erom in the semi sensitive group, Zare and Bezostaya in moderately tolerant group and Pisgham in tolerant group were.