The formation of a phytopathogenic microbiome as a factor of biological pollution of agrocoenoses of vivas

Abstract

The formation of the phytopathogenic microbiome as a factor in the biological contamination of oat agrocenoses is an important research task, the solution of which will make it possible to create ecologically balanced agroecosystems. This will increase their ability to self-regulate the population of micromycetes in order to obtain high-quality and safe oat raw materials. Therefore, the influence of environmental factors (abiotic, biotic, anthropogenic) on the formation of micromycete populations in the oat leaf microbiome under different plant growing technologies was studied. The article presents the results of ecological assessment of oat plant varieties based on indicators of influence on population density, frequency of occurrence, and intensity of sporulation of micromycetes. Vegetative organs of oat plants of Parlamentskyi and Tembr varieties were selected in the following phases: tillering, emergence into tubes and earing. It was determined that climatic conditions, as an abiotic factor, namely an increase in air temperature, frequent droughts, rare but abundant rains, which changed depending on the year of the study, significantly influenced the formation of micromycete populations in the oat leaf microbiome. Plant growing technologies, as an anthropogenic factor, significantly influenced the spectrum of species and their frequency of occurrence in the leaf microbiome of oats of various varieties. Under the organic technology of growing plants, the spectrum of micromycete populations was more diverse, but with a lower frequency of occurrence of species compared to the traditional technology of growing plants. Also, varieties of oat plants, as a biotic factor, thanks to the physiological substances of plants, are able to restrain the spread of micromycete populations in the leaf microbiome of plants or stimulate them. It was found out that with the traditional and organic technology of growing plants in the leaf microbiome of Tembr oat variety, the population density, the frequency of occurrence of micromycete species, and the intensity of sporulation were significantly lower compared to Parlamentskyi oat variety plants. This indicates that the cultivation of oat varieties capable of restraining the formation of micromycete populations at an ecologically safe level will ensure a decrease in the level of biological pollution of agrocenoses and increase the biosafety of plant raw materials