Anthracnose (C. acutatum) is a dangerous strawberry disease. The creation of varieties resistant to anthracnose is an important direction of strawberry breeding. Using the diagnostic DNA marker STS-Rca2_240, the Rca2 gene, which controls strawberry resistance to C. acutatum isolates of pathogenicity group 2, was identified in four strawberry varieties, which was 16.7 % of the total number of analyzed genotypes. Among Russian strawberry genotypes, the Rca2 gene was detected in the variety Borovitskaya. Among foreign strawberry genotypes, the Rca2 gene was detected in the varieties Laetitia, Portola and Selva. The remaining analyzed strawberry genotypes are characterized by the homozygous state of the rca2 allele and, therefore, susceptibility to anthracnose. In the Borovitskaya variety, the Rca2 resistance allele is present in the heterozygous form. In the Laetitia, Portola and Selva varieties, the Rca2 resistance allele is present in homozygous or heterozygous form. These strawberry varieties are recommended as promising genetic sources of the Rca2 gene in breeding for resistance to C. acutatum pathogenicity group 2.

Lyzhin Alexander S., Lukyanchuk Irina V.

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