The survey of cold hardness in some olive (Olea europaea L.) cultivars

In order to survey cold hardiness in olive trees, this experiment was conducted on one-vear-old olive plants CV: (Zard, Roghani, mission and Kronoeiky during 2001-2002. The experiment was carried out at two different phase of plant growth (acclimated and non-acclimated to cold hardiness). In order to measure total soluble carbohydrate, leaf samples were provided. Also in order to determine percent of ionic leakage, leaf tissues were exposured to artificial temperatures 0, -4, -8, and -12degreesC, ranged 4oc per hour. The results show that the amount of soluble carbohydrate during fall increased as a results of internal physiological reactions related to cold acclimatization in the plants, also the result show that the amount of soluble carbohydrate in the native cultivars were higher than foreign cultivars. Base on ionic leakage studies during non cold acclimatization phase, cultivars are classified as hard, semi hard and sensitive to cold, more ever the use of lower temperatures especially during cold acclimatization phase will help us to get certain results.