Polyphenol oxidase (PPO) activity was investigated during rooting in cuttings from three different grape cultivars (Vitis vinifera L. cvs. Muscat, Cardinal and Perlelte), and the enzyme activity and rooting ability were compared. Rooting was observed on the Muscat and Perlelte cuttings, but not on the Cardinal cuttings. PPO activity started to increase in the early stage of the experiment, and ...

This study was carried out to determine ability of secondary buds winter freezing in two Vitis species viz. vinifera L. and labrusca In 2016 2017, one genotype V. were sampled at 3 different periods during dormant period. The one-year-old shoots obtained from vineyards the on 4th, 5th 6th nodes has been used for test. For test, DTA (Differantial Thermal Analyses) methods test started +4 oC temp...