Study of the structure of potato varieties to Phytophtora infestans (Mont.) de Bary, Synchytrium endobioticum (Schilb.), Globodera pallida (Stone), Globodera rostochiensis (Wollenweber), PVY, PVX in Primorsky Krai

Relevance. One of the important directions of potato breeding is the creation of varieties resistant to a complex of diseases, such as late blight, viral and fungal infections, as well as parasitic nematodes. The use of DNA markers to identify valuable genotypes accelerates the selection process of resistant varieties, thereby increasing the efficiency of breeding.

Methods. The aim of the study was to study the resistance of 23 potato varieties to the local isolate Phytophthora infestans (Mont.), as well as to determine the genes of resistance to pathogens: potato cancer, pale and golden cyst-forming nematodes, X and Y viruses, late blight. Potato leaves were treated with Putzilovka-2019 isolate inoculum and kept in the dark for 24 hours, then placed in a climate box. Records were kept on the 6th day after inoculation.

Results. Latona, Bryansk delicacy, Gala, Dachny, Kazachok, Adretta varieties showed high resistance to late blight — 0.0% of leaf surface damage. High resistance to late blight was also demonstrated by the varieties Laperla, Belmonda, Impala, Violet, Zhukovsky early, Queen Anne, Sante, Amber, in which the leaf lesion area ranged from 3.0 to 10.0%. During molecular screening, the potato cancer resistance gene (Senl) Nl25 was detected in 22 varieties, the H1 resistance gene in 15 varieties, and the Gpa2 resistance gene in 9 varieties, the gene encoding resistance to virus X (Rxl) was detected in 13 varieties.

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