Original Research Article
Year: 2017 | Month: October | Volume: 4 | Issue: 10 | Pages: 38-45
Evaluation of Cold Tolerance of Dormant Buds According to Position Using Thermal Analysis in Karaerik (V. vinifera L.) Grape
Ayhan Buztepe1, Cafer Kose1, Ozkan Kaya1,2
1Department of Horticulture Faculty of Agriculture Ataturk University, 25240 Erzurum, Turkey
2Erzincan Horticultural Research Institute, 24060 Erzincan, Turkey
Corresponding Author: Cafer Kose
ABSTRACT
The study was conducted on Karaerik grape cultivar the aim was to determine the low temperature tolerances of winter buds taken from different positions during the dormant season. In this study, mean temperature values which were mean high temperature exotherms (mHTE) and mean low temperature exotherms (mLTE) known as indicator of low temperature tolerance in primary buds of winter, buds found in the 1st, 2nd, 3rd, 4th, 5th and 6th nodes of one-year-old shoot were determined. In the examination, mHTE and mLTE values of primary buds of winter bud during the dormant season for first year were found to be -5.54°C and -9.01°C respectively, mHTE and mLTE values of those of second years were established as -6.86°C and -9,06°C, respectively. In Karaerik grape cultivar, tolerance levels of primary buds of winter bud to low temperatures were determined to be in maximum levels in the end of November, December and January. Also, winter buds on 4th, 1st and 2nd nodes were found to be more tolerant than other buds, and cold hardiness of primary buds in Karaerik grape cultivar is affected differently by temperature at different time during the dormancy season in buds taken from different positions. But, studying the cold hardiness of winter buds at dormant phases and their correlation with physiological and biochemical changes during the dormancy cycle of winter buds taken from different positions is worthy to be considered in future researches.
Key words: Grapevine, Erzincan, frost tolerance, low temperatures exotherms, Karaerik
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