Fruit growing
and viticulture of South Russia

Annotation

This study aimed to assess the influence of the factors �plant organ�, �variety origin�, �berry color� and �ripening period� the content of phenolic substances in the grape plants using statistical processing methods. Qualitative and quantitative analysis of the phenolic substances (hydroxycarboxylic acids, flavonols, flavan-3-ols, oligomeric procyanidins, stilbenes) of the main grape groups was carried out using the high effective liquid chromatography. The variability of phenolic substances content was studied according to the plan of a full four-factor experiment (a total of 36 variants in triplicate). Statistica 10 (�StatSoft�, Inc., USA) application software package was used for data analysis. The results of the analysis of variance of the content of phenolic groups substances in the grape plants showed that the influence of the factors �plant organ�, �variety origin� and �ripening period� on the indexes of these substances is reliable. The �berry color� factor affected only the concentration of hydroxycarboxylic acids when interacting with the factors of �plant organ� and �ripening period�. Interaction of different factors variants among themselves significantly affected the amount of hydroxycarboxylic acids, flavonols, stilbenes and oligomeric procyanidins. Based on forecasting profile analysis, one should expect high values of hydroxycarboxylic acids, flavonols and flavan-3-ols only in the early stages of grape berry ripening, and oligomeric procyanidins in the later dates of ripening. The maximum quantity of stilbenes should be expected in interspecific grape varieties in the early stages of berry ripening, in autochthonous varieties � in the later stages. By manipulating the affect conformity in natural lows of both individual factors and their combinations, one can predict the desired effect and achieve the optimal qualitative and quantitative ratio of various groups of phenolic compounds in the grape plants.