PERSPECTIVES OF BREEDING OF VEGETABLE CROPS OF FABACEAE FAMILY TO BEAN YELLOW MOSAIC VIRUS (Potyvirus, Potyviridae) RESISTANCE IN THE CONDITIONS OF MOSCOW REGION

In the context of climate change phytomonitoring of the prevalence of the most common viral pathogens on the crops becomes even more important, because during the last decades the harmfulness of those pathogens, in particular Bean yellow mosaic (BYMV) has grown in intensity. The causative agent as the most members of Рotyvirus genus, has a wide range of host plants belonging to various families including Fabaceae. In Russia the virus was for the first time identified in the south of the Far East, where in the middle of XX century the massive damage of clove, lupine, sweet pea, pea, bean and Russian bean was observed. The distribution area of BYMV considerably expanded after advancement of heat-loving leguminous crops towards north. During the last years epiphytotics were reported in the planted crops of kidney bean (Phasйolus vulgбris L.), and Russian bean (Faba bona Medik. var. major Harz.) under conditions of temperate continental climate of nonchernozem belt in the RF. It is not feasible to eradicate natural BYMV foci, while the control of the causative agent carriers as a preventive measure is not very effective. There fore at present the search for the sources of resistance to BYMV and creation of parent selection material is a priority area of our phytopatologic research. At the present stage the tasks included: identification and study of the properties of BYMV Moscow isolates; integral assessment of resistance and other economically valuable characteristics of collection material and breeding stock material of kidney bean (810 specimens) and Russian bean (40 specimens) generated in the Laboratory of Legume Selection and Seed Production, Federal State Budgetary Scientific Institution “Federal Scientific Vegetable Center”. To achieve the goal visual, serological diagnostic methods were used together with biotesting and electron microscopy. The research revealed special physical-chemical characteristics of BYMV Moscow isolates characterized by 100% harmfulness when occurred as co-infection with the other viruses. The main symptoms caused by the above isolates in indicator plants and host plants under conditions of Moscow Region have been described. Evaluation of collection and selection materials of kidney bean and Russian bean formed the basis for identification of the sources of resistance to BYMV exhibiting integrated economically valuable properties (early ripeness, bean shape and color, productivity, etc.). These specimens have been included into