Breeding source material of table carrot resistant to early blight on an artificial infectious background

Abstract

The paper presents the results of an immunological assessment of the lesion of table carrot varieties by Alternaria on an artificial infectious background in the conditions of the Moscow region in 2011-2019. To carry out visual assessments of the resistance of varieties, seeds were sown on an artificial infectious soil background of A. radicina (root confinement), additionally with subsequent spraying of plants with a spore suspension of A. dauci (leaf confinement). The studied varietal material of table carrots was divided into groups depending on the resistance - susceptibility range. The studies were based on successive selections of resistant plants (genotypes) over 6-8 years, even with a minimal number of them. As a result of four cycles of selection against an artificial infectious background of genotypes (plants) at different stages of ontogenesis, an increase in resistance was noticed. Each subsequent selection was characterized not only by the number of relatively resistant plants in the studied variety populations increased, but also the decreased average score of their lesion. Based on this, the authors have identified the breeding material of table carrots with high resistance to alternariosis.