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 416220
Title Monitoring the Dutch Phytophthora infestans population for virulence against new R-genes
Author(s) Förch, M.G.; Bosch, G.B.M. van den; Bekkum, P.J. van; Evenhuis, B.; Vossen, J.; Kessel, G.J.T.
Source In: Proceedings of the Twelfth EuroBlight (A potato late blight network for Europe) workshop, Arras, France, 3-6 May 2010. - Lelystad : Applied Plant Research - p. 45 - 50.
Event Lelystad : Applied Plant Research Twelfth EuroBlight Workshop, Arras, 2010-05-03/2010-05-06
Department(s) PRI BIOINT Ecological Interactions
PRI BIOINT Entomology & Virology
OT Team Schimmels Onkr. en Plagen
Biointeracties and Plant Health
Plant Breeding
Publication type Contribution in proceedings
Publication year 2010
Abstract New possibilities offered by marker assisted breeding and GMO breeding have sparked renewed international efforts to breed for durable potato late blight resistance. Phytophthora infestans is however known for its adaptability, a trait confirmed by recent discoveries on the structure of the P. infestans genome. One of the possibilities to enhance the durability of newly introduced host resistance is to monitor the pathogen population for virulence to new R genes, prior to - and after their introduction. The late blight control strategy should be adapted accordingly. The Dutch P. infestans population was monitored during the growing seasons 2006 – 2008. P. infestans isolates were collected from blighted production fields and from bait fields in which R gene containing potato clones were grown without fungicide protection. A selection of the P. infestans isolates collected were characterized for virulence to a range of new R genes using a detached leaf bio-assay. Virulence for all single R genes tested was found. When we focus on R genes Rpi-blb1 and Rpi-blb2, no virulence was found in 2006. One Rpi-blb1 virulent isolate was found in 2007. Another 2007 isolate was found to be virulent to Rpi-blb2. Depending on the genetic background in which Rpi-blb1 was placed 13 or 21 isolates were virulent in 2008. Depending on the genetic background in which Rpi-blb2 was placed 4 or 11 isolates were virulent in 2008. One isolate was found to infect the stacked Rpi-blb1 and Rpi-blb2 resistance genes in a detached leaf assay. From these findings it is recommended that monitoring systems should be part of future potato late blight control strategies. The resulting information on the dynamics of virulence within the local P. infestans population can then be used to enhance the durability of newly introduced host resistance
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