Contribution of Metallogenium-Siderococcus bacteria to the postvolcanic transformation of igneous material (Kamchatka)

The transformation of recent igneous rock occurs with participation of microorganisms associated with the deposition of iron and aluminum on their cell surface. An identity of morphological structures was found in the microorganisms in both cases, and this fact counts in favor of their similarity and wide distribution in the rock being transformed. The polymorphous acid-resisting organism identified by our studies was tentatively classified with the Metallogenium-Siderococcus group.     

Analysis of the VIR fiber flax collection for solving problems of breeding for improving fiber quality

The fiber flax collection of the Vavilov All-Russian Research Institute of Plant Industry (VIR), numbering 1844 accessions, has been completely analyzed with respect to economically valuable traits for the purpose of revealing initial material with a high fiber quality. The richest diversity of genotypes with various combinations of traits determining fiber quality has been established. The best accessions with a maximum set of other valuable properties have been distinguished.     

Colletotrichum coccodes in potato and tomato leaves in Russia

Journal of Plant Diseases and Protection - Colletotrichum coccodes is a plant pathogenic fungus affecting different organs of potato, tomato, and some other plants. The leaf infection with C....     

Microbiological characterization of soddy soils of the Severnaya Dvina River floodplain

Soils of virgin lands, hayfields, and plowed lands were studied in the Severnaya Dvina River floodplain. The potential possibilities of microbiological processes were shown to increase in the summer in the soils in the following sequence as related to the increasing number of copiotrophs in them: virgin land—hayfield—plowed land. Copiotrophs are microorganisms that use easily available organic substances, including nitrogencontaining ones. The increase in their number enhanced the nitrification, while other microbiological processes became weaker. The number of fungi increased due to the improvement of the water-air regime. As the agricultural use of the soils became more intense, the cellulose decomposition slowed down, the actual nitrification ability was lowered, and the carbon content in the physiologically active microbial biomass decreased because the area of the natural plant cover was reduced from the virgin land to the plowed land.     

Structure of the microbial complex in wheat rhizosphere under herbicide stress

The use of mathematical analysis made it possible to show that prometryn applied in pot experiments affected indirectly (via plants) the microbial community in the spring wheat rhizosphere. On the one hand, prometryn inhibited photosynthesis and reduced plant productivity, resulting in a decrease in the amount of root exudates and the number of their consumers. On the other hand, it promoted dying off of root tissues and activated fresh organic matter decomposition with participation of fast growing heterotrophs at first, and at the final stages of the microbial succession, cellulolytic microorganisms appeared. Against this background, the biologically active substrate intensified the soil microbiological processes, reduced the adverse effect of prometryn on the development of plants, and created more favorable conditions for the functioning of microorganisms.