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The article represents the comprehensive study of the resistance of ornamental plants Phlox paniculata L. to the biotic stress caused by the causative agent of powdery mildew (Erysiphe cichoracearum DC. f. phlogis Jacz.). The aim of the study was to investigate biochemical parameters in leaves of plants with different degree of resistance to the damage. in the conditions of the Forest-Steppe of Ukraine. There were classic common methods of determining the content of anthocyanins, catechins, proline, flavonoids applied in this work study. The varieties of fall phlox were studied: 'Katharine', 'Panianka', 'Tenor', 'Poliarnyi', 'Fiosin', 'Mohuchii', 'Rembrandt', 'Holubka', 'Novinka', 'Fujiyama', 'Detstvo'. The main result of the experiments is to establish a mechanism for the secondary metabolites use (catechins, flavonoids and anthocyanins) in the process of the increased plant resistance formation. As a result, the content of flavonoids is significantly reduced, in the affected plants, and the content of catechins and anthocyanins is significantly increased compared with the intact ones on the contrary. It is noted, that the content of flavonols in plants with powdery mildew is significantly lower in comaprison with unaffected plants from 8.0 to 61.55 %. The flavonols are obviously consumed during anthocyanins and catechins recovery reactions. In addition, there is a tendency for a significant increase in the content of the catechins in the affected powdery mildew plants compared to the non-affected ones generally 8-21 %. The anthocyanin content in the affected plants was also higher on 18˗48 %. Therefore, studies represent that the content of secondary metabolites is a marker of Ph. paniculata plants stability to the cause of powdery mildew unlike proline.

Вміст біохімічних речовин у рослин Phlox paniculata L. в умовах Лісостепу України