The correlation of the accumulation of cold units with some physiological and biochemical processes in the floral buds in the cultivation of nectarines (Prunus persica var. nectarina) in north-western Romania

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Article Title:	The correlation of the accumulation of cold units with some physiological and biochemical processes in the floral buds in the cultivation of nectarines (Prunus persica var. nectarina) in north-western Romania
Authors:	Simona Ioana Vicaş, Vasile Laslo
Affiliation:	University of Oradea, Faculty of Environmental Protection, Romania
Abstract:	The knowledge of physiological and biochemical mechanisms which are at the base of cold resistance for fruit trees cultivated in the temperate climate represent an important aspect for the practice of cultivating trees. The purpose of this study was to determine the relationship between the content of phenolic compounds, proteins and peroxidase in flower buds in 5 varieties of nectarines (Cora, Ark 165, Delta, Romamer II and Crimson Gold) cultivated in N-W Romania and the debut of the stages of ectodormancy, endodormancy and ecodormancy. The dynamic of these compounds was correlated with the calculation of chill units necessary for the phenological stages. The biochemical parameters followed have had a characteristic seasonal dynamic for every cultivation, also influenced by the accumulation of chill units.
Keywords:	Prunus persica var. nectarine, phenolic compounds, peroxidase, flower buds, chill units
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*Correspondence:	Simona Ioana Vicaş, University of Oradea, Faculty of Environmental Protection, 26 Gen. Magheru St., 410048 Oradea, Romania, e-mail: svicas@uoradea.ro, sim_vicas@yahoo.com