The study was carried out on the one-year-old dormant branches with four different sweet cherry varieties in the natural temperature reduction process.The changes of the relative electrical conductivity,superoxide dismutase(SOD),peroxidase(POD),soluble protein,proline and malondialdehyde(MDA) were measured in order to follow the cold hardiness of different sweet cherry varieties according to the correlation between these parameters and the cold hardiness.The results showed that the relative electrical condu...