Evaluation of Cold Tolerance in some Olive (Olea europaea L.) Cultivars in Tarom

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Abstract

Due to drought and salt tolerance of olive tree and economical value, olive is one of the most important horticultural products of Tarom region. The occurrence of lower temperature up to -8oC is one of the main limiting factors of olive cultivation in the this region. The frost symptoms such as wilting, necrosis, drop of leaves, dried twigs, cracks in bark and shoots were recorded in 39 local and foreign olive cultivars grown at Collection Garden of Tarom Olive Research Station during 2006 and 2007 when a severe cold and freezing conditions occurred in this region. The results showed that cold tolerance among olive cultivars were significantly different. The cultivars Cailetier, Hamed, Karidolia, Kalamata, Leccino, Mastoidis, Corfolia, Balady, Koroneiki and Oblonga were susceptible to cold. In these cultivars barks of one year or older shoots were cracked and in some cultivars necrotic signs on phloem tissue were clearly observed, as well as tubing and dropping of leaves. Cultivars Grossane, Toffahi, Khodeiry, Don, Doeibli, Sorani, Zard, Mari, Jollat, Cornicabra, Konservolia, Lechin de sevilla, Picual and Manzanilla de sevilla were cold tolerant and did not show any signs of frost damage. Study of nutrient uptake by susceptible and resistant cultivars showed that N uptake by susceptible cultivars during autumn were more than resistant cultivars, versus in resistant cultivars K uptake were higher than susceptible cultivars. The microelements uptake by susceptible cultivars in autumn was also more than resistant cultivars.

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