ЗНАЧЕНИЕ ВТОРИЧНЫХ МЕТАБОЛИТОВ В ФОРМИРОВАНИИ УСТОЙЧИВОСТИ К МУЧНИСТОЙ РОСЕ ДЕРЕВЬЕВ 16-ЛЕТНЕЙ КУЛЬТУРЫ ДУБА ЧЕРЕШЧАТОГО

Abstract

RUSSIAN JOURNAL OF FOREST SCIENCE, 2019, No. 2, P. 128-137 ROLE OF SECONDARY METABOLITES IN DEVELOPMENT OF RESISTANCE TO POWDERY MILDEW ON TREES OF 16-YEAR OLD PLANTATION OF ENGLISH OAK L.\xa0V. Polyakova 1,2 , V. I. Litvinenko 2,3 1 Research Institute of Forest Genetics and Breeding Lomonosov st. 105, Voronezh, 394087 Russia 2 Ukrainian Research Institute of Forestry and Forest Melioration Pushkinska st. 86, Kharkiv, 61024 Ukraine 3 State Research Сenter of Medications Astronomicheskaya st. 33, Kharkiv, 61085 Ukraine E-mail: [email protected] Received: 10 December 2016 16-years old plantation of English oak, having 57 % infected by powdery mildew, was studied. Biochemical data showed significant differences in synthesis of secondary metabolites of phenilpropanoid structure (flavonols (FL) and condensed tannins(CT)) between resistant and vulnerable trees to powdery mildew. Vulnerable trees synthesize on average 50-150% more of CT, and 20-40% less of FL. Elevated level of CT is likely not toxic to the pathogen because it does not limit growth of mycelium on a surface of a leave. Contrarily, decrease in FL level in part of a leave, covered by the mycelium points to their likely toxicity. Changes in proportions of CT and FL, synthesized in leaves, caused by pathogens points to a destabilization of secondary metabolism in the vulnerable trees. Also, mean diameter of the resistant trees was 7.2 % less than of the vulnerable to infection. This might be caused by the decrease in FL, which are known as inhibitors of axial transport of auxins. An important feature of FL is antioxidant activity, rising resistance to UVB radiation, draughts as well as reducing injuries from active forms of oxygen. Decrease in UVB in leaves, vulnerable to powdery mildew may affect their sustainability and may result in earlier elimination from forest. 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