The correlation of the accumulation of cold units with biochemical processes in the floral buds of apricots (armenia vulgaris) from Romania

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Article Title:	The correlation of the accumulation of cold units with biochemical processes in the floral buds of apricots (armenia vulgaris) from Romania
Authors:	Vasile Laslo, Simona Ioana Vicas
Affiliation:	University of Oradea, Faculty of Environmental Protection, Oradea, Romania
Abstract:	Knowledge of the physiological and biochemical mechanisms which form the fundamental for temperate climate cultures of fruit-bearing trees’ resistance to cold is an important aspect of horticultural practice. This study aims to determine the relationship between the content in phenolic compounds, proteins and peroxidase in floral buds of 9 varieties of apricot (Rares, CR24-12, CR2-63, Carmela, Viorica, Sirena, Saturn, Mamaia and Comandor) grown in North-West of Romania and the initiation of ectodormancy, endodormancy and ecodormancy stages. The phenolic compound content showed a seasonal dynamic in all the studied varieties. The peak quantity of phenolic compounds was recorded in all cultivars at the end of January, the Carmela and Rares varieties standing out (0.015 ± 0.17 mg GAE/g fresh weight, respectively 0.012 ± 0.039 mg GAE/g fresh weight), followed by a decrease in February. Peroxidase activity showed the same pattern in all cultivars. Protein content showed a pattern similar to those of peroxidase and phenolic compounds, reaching a peak at the end of January, followed by a dramatic decrease starting in February. The studies of biochemical parameters showed a characteristic seasonal dynamic for each cultivar, influenced by the accumulation of cold units that are needed for some phenological stages to occur.
Keywords:	Armenia vulgaris, phenolic compounds, peroxidase, flower buds, chill units
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*Correspondence:	Vasile Laslo, University of Oradea, Faculty of Environmental Protection, 26 Magheru, 410048 Oradea, Romania, phone: 0040259412550, fax: 0040259416274, e-mail: vasilelaslo@yahoo.com