Author:
Pintye Alexandra,Németh Márk Z.,Molnár Orsolya,Horváth Áron N.,Matolcsi Fruzsina,Bókony Veronika,Spitzmüller Zsolt,Pálfi Xénia,Váczy Kálmán Z.,Kovács Gábor M.
Abstract
AbstractGenetically distinct groups of Erysiphe necator, the fungus causing grapevine powdery mildew infect grapevine in Europe, yet the processes sustaining stable genetic differences between those groups are less understood. Genotyping of over 2000 field samples from six wine regions in Hungary collected between 2017 and 2019 was conducted to reveal E. necator genotypes and their possible differentiation. The demethylase inhibitor (DMI) fungicide resistance marker A495T was detected in all wine regions, in 16% of the samples. Its occurrence differed significantly among wine regions and grape cultivars, and sampling years, but it did not differ between DMI-treated and untreated fields. Multilocus sequence analyses of field samples and 59 in vitro maintained isolates revealed significant genetic differences among populations from distinct wine regions. We identified 14 E. necator genotypes, of which eight were previously unknown. In contrast to the previous concept of A and B groups, European E. necator populations should be considered genetically more complex. Isolation by geographic distance, growing season, and host variety influence the genetic structuring of E. necator, which should be considered both during diagnoses and when effective treatments are planned.
Funder
Széchenyi 2020 Programme, the European Regional Development Fund and the Hungarian Government
János Bolyai Research Scholarship of the Hungarian Academy of Sciences
National Research, Development and Innovation Fund
Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund
ELKH Centre for Agricultural Research
Publisher
Springer Science and Business Media LLC
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