Генетична структура популяцій збудника фітофторозу картоплі в умовах Західного Лісостепу України / Genetic structure of populations of causal agent of late blight of potato in Western Forest-Steppe of Ukraine
Journal Title: Вісник Львівського національного аграрного університету. Агрономія - Year 2018, Vol 22, Issue
Abstract
The late blight was and still one of wide-spread and harmful disease of potato in the world and in particular in conditions of Western Forest-Steppe of Ukraine. The breeding of resistant varieties against pathogens is efficient measure of plant protection against dominant causal organisms of diseases. The plant selection on resistance against causal organisms of diseases is based on understanding of interaction of pathogens and host plant. Potato plant have vertical or races specifical (based on having R-genes in variety's genotype) and horizontal or field (polygenic control) resistances. The knowledge of race structure of pathogen populations allow to use the plants select with resistance against causal agent of disease more effectively. In our research was tasted of P. infestans isolates from populations in Dubliany town (Lviv region Zhovkva district), Obroshyno town (Lviv region Pustomyty district), and Volyn region Volodymyr-Volynsk district (households). Comparison for frequency of virulence genes and parts of races with different numbers of these genes in populations of causal organism of late blight of potato in Western Forest-Steppe of Ukraine in 2010 and 2016 are carried out. The highest frequency in conditions of both years was for genes V5, V7 and V8 – 75,6–85,2 %. It was determined some decrease of frequency of all genes in populations P. infestans, except V5 and V7. The least frequency was for genes V3, V10 and V11 – 2,1–16,0 %. In populations of causal agent were detected races with 2–9 genes in 2010, whereas in 2016 races with 9 virulence genes were not detected. The highest parts were for races with 4–5 genes in conditions of both years. In conditions of both years the least parts were for races with 2, 3, 6, 8 and 9 genes – 2–12 %.
Authors and Affiliations
Yulia Holiachuk, Halyna Kosylovych
Keywords
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