Virulence structure within the population of Pseudoperonospora cubensis in the United States

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73582556" target="_blank" >RIV/61989592:15310/17:73582556 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1094/PHYTO-07-16-0277-R" target="_blank" >http://dx.doi.org/10.1094/PHYTO-07-16-0277-R</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1094/PHYTO-07-16-0277-R" target="_blank" >10.1094/PHYTO-07-16-0277-R</a>

Result language

angličtina

Original language name

Virulence structure within the population of Pseudoperonospora cubensis in the United States

Original language description

Cucurbit downy mildew (CDM), caused by the obligate oomycete Pseudoperonospora cubensis, has resurged around the world during the past three decades. In total, 22 isolates collected between 2004 and 2014, mainly in the eastern United States, were tested for their compatibility with a set of 15 cucurbit host types. The virulence structure within these isolates was evaluated on a set of 12 differential genotypes from eight genera. All isolates were highly compatible with the susceptible cultivar of Cucumis sativus, whereas the least compatibility was observed with Luffa cylindrica and Momordica charantia. Five pathotypes (1, 3, 4, 5, and 6) were identified among the 22 isolates examined. Pathotypes 1 and 3 had not been previously described in the United States and isolates of these two new pathotypes were also compatible with Poinsett 76&apos;, a cultivar of C. sativus known to be resistant to CDM prior to 2004. Virulence within the pathogen population was expressed based on virulence factors, virulence phenotypes, and virulence complexity. The number of virulence factors ranged from two to eight, indicating a complex virulence structure, with 77% of the isolates having five to eight virulence factors. Thirteen virulence phenotypes were identified; the mean number of virulence factors per isolate and mean number of virulence factors per virulence phenotype was 5.05 and 5.23, respectively, indicating that complex isolates and phenotypes contributed equally to the complex virulence structure of P. cubensis. Gleason and Shannon indices of diversity were 3.88 and 2.32, respectively, indicating a diverse virulence structure of P. cubensis within the United States population. The diverse virulence and high virulence complexity within the pathogen population indicate that host resistance alone in available cucurbit cultivars will not be effective to control CDM.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Project

<a href="/en/project/QH71254" target="_blank" >QH71254: Inovation of the metods of the protection of sunflower</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Phytopathology

ISSN

0031-949X

e-ISSN

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Volume of the periodical

107

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

777-785

UT code for WoS article

000404548100017

EID of the result in the Scopus database

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