عنوان مقاله [English]
In this study, the winter cold tolerance of seven strawberry cultivars was evaluated using a RCBD design with a split plot arrangement at Bu-Ali Sina University in 2014. After exposure of plants to low temperatures (+4, -5, -10, -15, -20 and -25oC), the values of electrolyte leakage, index of freeze injury, RWC, total chlorophyll and chlorophyll fluorescence parameters (F0, Fm, Fv and Fv/Fm) were measured. Low temperature, cultivar and their interactions had significant effects (P≤0.01) on all measured parameters. Means slicing of traits showed that genotypic differences were most obviously identified in -25oC as compared to the other temperature treatments. There was strong correlations between the evaluation methods for screening winter cold tolerant cultivars. The strawberry `Karssenberg' and `Queen Elisa' were the most cold tolerant cultivars with the lowest electrolyte leakage and freeze injury index. These cultivars had the highest chlorophyll content and chlorophyll fluorescence rates in -25oC whereas `Chandler' and `Tennessie Beauty' with the highest electrolyte leakage and freeze injury index values, the lowest chlorophyll content and chlorophyll fluorescence rates in low temperatures, were the most susceptible cultivars to low temperatures.
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