Impact of the biological preparation Extrakon on photosynthetic apparatus, enzymatic activity of antioxidant enzymes and performance of spring wheat plants in the host-pathogen system

Abstract

Aim. A complex study of the impact of the consortium of humus-forming microorganisms in the composition of the biological preparation Extrakon, introduced into the rhizosphere, on the intact plants and plants, infected with phytopathogenic microorganisms Pseudomonas syringae pv. atrofaciens st. 9771 and Acholeplasma laid- lawii var. granulum st.118. Methods. Microbiological, physiological and biochemical, biophysical, statistical. The impact of the multifunctional biological preparation Extrakon, introduced into the soil, was studied using physiological and biochemical indices, in particular, catalase and peroxidase activity of tissues and the content of chlorophylls a and b, the photochemical activity of the photosynthetic apparatus and the grain performance of the intact spring wheat plants, Pechernianka cultivar, and plants, infected with phytopathogenic microorgan- isms P. syringae pv. atrofaciens st. 9771 and A. laidlawii var. granulum st. 118. Results. The application of the consortium of humus-forming microorganisms in the composition of the biological preparation Extrakon resulted in registered stabilizing protective impact on the pigment composition of the leaves of spring wheat plants and their photochemical activity, especially when infected with phytopathogenic bacteria. If the wheat plants were in- fected on the background of the introduction of preparation Extrakon into the soil, the losses in grain performance were reduced. Conclusions. The biological preparation Extrakon neutralizes the destructive effect, conditioned by the phytopathogens of species P. syringae pv. atrofaciens st. 9771 and A. laidlawii var. granulum st. 118, on the photosynthetic apparatus of the host plant. This impact leads to the increase in the content of pigments in the leaves and induces the development of the resistance to damage in the conditions of the oxidative stress with the increase in the level of antioxidant enzymes activity, especially catalase, in the tissues. This is accompanied with the increase in the photosynthetic activity of leaves and the grain performance of plants.