Abstract
The main task of the investigation was to study the interrelations and to single out the sustainable clusters which reflect the content of different chemical substances in fruit, but have a tendency of slight correlation between each other. All these should become a base for definition of combination of fruits and berries containing a balanced set of useful compounds. It will help to make a composition of special food production. More than 170 fruit varieties of 13 fruit and berry like crops (apple, pear, apricot, plum, cherry, strawberry, black currant, red currant, viburnum, sea-buckhorn, honeysuckle) were studied for chemical indices content in their fruits and berries. The composition of chemical substances was chosen takng into account the specific features of all the investigated crops (dietary fiber, ascorbic acid, malic acid, citric acid, glucose, fructose, sucrose, Na, K, Ca, Mg, Fe, Cu, Zn). In order to study the correlation of the substances in the content, the principal component analysis was applied. As a result of the research, five clusters of the interrelated characters were singled out, these ones were linked to the first 5 the most important principal components. These components account for 78.23% of total variability of traits. The first component which accounts for 25.46% of total variability of traits is closely correlated with dietary fiber and organic acids content. The second component which accounts for 18.20% of total variability is closely connected with Ca, Fe, Zn content. The third component is correlated with Na, K, fructose and glucose contents.