Influence of artificial inoculation by strains of phytopathogenic microorganisms isolated from different sources on physyological and biochemical parameters of galega orientalis plants

Aim. To evaluate changes in the physiological and biochemical parameters of Galega orientalis plants by the influence of artificial inoculation by phytopathogenic microorganisms, that have been isolated from various sources: strains of phytoplasmas – Acholeplasma laidlawii var granulum 118, isolated from wheat and Acholeplasma laidlawii 101 and 178, isolated from tomato and bacterial strain – P. syringae pv. atrofaciens D13, which have been isolated from wheat.Methods. Microbiological methods – cultivation in the liquid nutrient medium, isolation of phytopathogenic microorganisms from plant material and artificial inoculation of experimental plants (subepidermal injection); biochemical – for the purpose of determination of photosynthetic pigments – chlorophylls a and b and carotenoids and activity of antioxidant enzymes catalase and peroxidase; photochemical – method of chlorophyll a fluorescence inducing to determine the photochemical activity of leaves; biometric – to determine the area of the root system and the number of nodules on the roots; statistical.Results of research. In field experiments on the crops of the Fodder Galega under the conditions of artificial infection with strains of phytopathogenic microorganisms of different taxonomic groups – A. laidlawii var. granulum 118 and P. syringae pv. atrofaciens D13 (both isolated from wheat) and strains – A. laidlawii 101 and 178, isolated from tomatoes, the following changes were observed in the physiological and biochemical parameters of Galega orientalis plants: reduction of chlorophyll a and b content with increasing carotenoid content and inhibition of quantitative efficiency of PSII, especially in mixed A. laidlawii var. granulum 118 and P. syringae pv. atrofaciens D13, which was accompanied by a decrease in the area of the root system and the number of nodules on the roots of the plants. It was found, that the highest total activity of tissue Galega orientalis oxidase reductases – catalase and peroxidase