Analysis of intrapopulation polymorphism of table carrot varieties for resistance to mycotic rot pathogens of root crops

Relevance. It was to study the variability of the degree of defeat of promising varieties of table carrots by diseases of various etiologies during storage for several years, to determine the level of their polymorphism based on resistance to various types of pathogens and the effectiveness of selection based on an individual immunological assessment of uterine root crops. Materials and methods. The experimental part of the work was performed in 2017-2020 at the FSBSI "Federal Scientific Vegetable Center" with carrot varietal populations of Margosha and Minor. The identification of the species composition of pathogens, the degree of damage, and the level of resistance of variety specimens were carried out in accordance with appropriate methods and determinants. For the immunological assessment of the resistance of carrot cultivars in vitro, the most virulent isolates of different types of fungi were used from the collection of the Laboratory of Immunity and Plant Protection of the Federal Center for Scientific Research. Results. It was established that in the populations of Margosha and Minor under natural storage conditions, the ratio and degree of spread of economically significant diseases differ significantly in different years. Based on an in vitro immunological assessment, a high polymorphism of the individual resistance of genotypes within both populations to the majority of micromycetes was revealed and the most resistant forms to the most dangerous types of pathogens were identified. Immunological analysis of the resulting offspring confirmed the high efficiency of group selection based on a comprehensive assessment of the stability of individual uterine root crops in vivo and in vitro.