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Rare Virulences and Great Pathotype Diversity of a Central European Blumeria hordei Population
Version 1
: Received: 25 September 2023 / Approved: 25 September 2023 / Online: 26 September 2023 (04:01:50 CEST)
A peer-reviewed article of this Preprint also exists.
Dreiseitl, A. Rare Virulences and Great Pathotype Diversity of a Central European Blumeria hordei Population. J. Fungi 2023, 9, 1045. Dreiseitl, A. Rare Virulences and Great Pathotype Diversity of a Central European Blumeria hordei Population. J. Fungi 2023, 9, 1045.
Abstract
Barley is an important crop grown on almost 49 Mha worldwide in 2021 and is particu-larly significant in Europe where powdery mildew is the most frequent disease on sus-ceptible varieties. The most suitable way for protecting crops is exploiting genetic re-sistance. However, the causal agent Blumeria hordei is an extremely adaptable pathogen. The aims of this research were to increase our knowledge of the rapidly changing path-ogen population and detect rare virulences. Random samples of the pathogen were ob-tained from the air by means of a mobile spore sampler. Spores were collected by driv-ing across the Czech Republic in 2019, 2021 and 2023 and 299 isolates were analyzed on 121 host varieties. No infection occurred on 35 differentials, rare virulence was recorded on 31 varieties and a higher virulence frequency was found on 55 differentials. A core set of differentials along with four additional varieties distinguish 295 pathotypes (Simple Index = 0.987) and virulence complexity of isolates varied from 4 to 19 with an average 10.39. The detection of new virulences, the increasing frequency of previously rare viru-lences and high pathotype diversity as well as high virulence complexity confirm that using nonspecific durable resistance is crucial for successfully breeding commercial va-rieties.
Keywords
barley; Blumeria graminis f. sp. hordei; Hordeum vulgare; reverse octal notation; powdery mildew; resistance genes; virulence complexity; virulence frequency
Subject
Biology and Life Sciences, Agricultural Science and Agronomy
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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