Determination of the frost stress durability of some evergreen plants

In this study, frost stress often used in landscaping work aims to determine the resistance of the ten plant species. For this purpose, were exposed to temperatures of -15 °C, -25 °C, -35 °C, -45 °C and -55 0C. Relative injury indices is a method commonly used to determine the degree of frost damage ion leakage calculated with use. The changeable in relative injury index due to temperature was found to be statistically significant at the reliability level of 99.9% in all species except for Cedrus libani. Ligustrum vulgare, Euonymus japonica, Mahonia aquifolium, Prunus laurocerasus, and Cedrus libani have been found to be least resistant strains against frost stress. Pinus sylvestris and Cupressus sempervirens, on the other hand, were seen to be the species affected by least frost stress. Biota orientalis, Pinus nigra and Picea pungens were found to be partially resistant to frost stress. The aim of the study, plants were exposed to temperatures of 3 °C, 0 °C, -3 °C, -7 °C and -14 ° C during the vegetation period in order to determine to what extent plants were affected by late frost damage. As a result of the study, Mahonia aquifolium ve Cedrus libani were the most affected by late frost stress and Cupressus sempervirens, Euonymus japonica, Biota orientalis, Picea pungens and Prunus laurocerasus were the least injured species in terms of relative injury index. In addition, the variation of photosynthetic pigment amounts of species exposed to temperatures of 3 °C, 0 °C, -3 ° C, -7 °C and -14 °C was determined according to the temperature.