Akademik Veri Yönetim Sistemi
Atatürk Üniversitesi Ziraat Fakültesi Dergisi, cilt.51, sa.3, ss.243-248, 2020 (Hakemli Dergi)
ABSTRACT: This study was conducted to determine the relationship between bud size and low temperature exotherm (LTE) formation in dormant period of grapevines. For this purpose, primary and secondary buds of Karaerik (Vitis vinifera L.) and 53 Pazar 01 (Vitis labrusca) genotypes which are known to have differences between the bud structure and size, were examined separately. In the study carried out in 2016-2017 and 2017-2018 dormant periods, low temperature exotherms were determined by Differential Thermal Analysis (DTA) method in order to determine the freezing point of the buds. Dormant buds of grapevine size were determined by microscopic imaging of the sections taken after histological procedures. It was demonstrated by the DTA test that the buds with different histological structures had different character and number of LTE. In this study, it was determined that bud samples belonging to Vitis vinifera L. form exotherm at lower temperatures than bud samples belonging to Vitis labrusca species. For both genotypes, it was determined by the histological determinations that the primary buds had a larger structure than the secondary buds. In the study, it was found that the buds with an area less than 0.010 mm2 did not produce LTE. As a result of the study, it was found that the bud structure and size were effective on LTE formation of grapevine dormant buds.
Keywords: Bud structure, Cold tolerance, Grapevine, Low temperature exotherms,