Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 536604
Title Evidence for selection pressure from resistant potato genotypes but not from fungicide application within a clonal Phytophthora infestans population
Author(s) Stellingwerf, J.S.; Phelan, S.; Doohan, F.M.; Ortiz, V.; Griffin, D.; Bourke, A.; Hutten, R.C.B.; Cooke, D.E.L.; Kildea, S.; Mullins, E.
Source Plant Pathology (2018). - ISSN 0032-0862
DOI http://dx.doi.org/10.1111/ppa.12852
Department(s) PBR Biodiversiteit en Genetische Variatie
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Host resistance - Phytophthora infestans - Population genetics - Potato - SSR genotyping
Abstract Insight into pathogen population dynamics provides a key input for effective disease management of the potato late blight pathogen Phytophthora infestans. Phytophthora infestans populations vary from genetically complex to more simple with a few clonal lineages. The presence or absence of certain strains of P. infestans may impact the efficacy of fungicides or host resistance. Current evidence indicates that genetically, the Irish populations of P. infestans are relatively simple with a few clonal lineages. In this study, P. infestans populations were genetically characterized based on samples collected at the national centre for potato breeding during the period 2012-16. The dominance of clonal lineages within this P. infestans population was confirmed and the potential selection pressure of fungicide treatment (2013-15) and host resistance (2016) on this clonal P. infestans population was then investigated. It was found that fungicide products did not notably affect the genetic structure of sampled populations relative to samples from untreated control plants. In contrast, samples taken from several resistant potato genotypes were found to be more often of the EU_13_A2 lineage than those taken from control King Edward plants or potato genotypes with low resistance ratings. Resistant potato varieties Sarpo Mira and Bionica, containing characterized R genes, were found to strongly select for EU_13_A2 strains.
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