The Synchytrium endobioticum AvrSen1 triggers a Hypersensitive Response in Sen1 potatoes while natural variants evade detection

Bart van de Vossenberg, Charlotte Prodhomme, G. van Arkel, M.P.E. van Gent-Pelzer, J.E.M. Bergervoet-van Deelen, Balázs Brankovics, J. Przetakiewicz, R.G.F. Visser, T.A.J. van der Lee, J.H. Vossen*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Synchytrium endobioticum is an obligate biotrophic fungus of the phylum Chytridiomycota. It causes potato wart disease, has a world-wide quarantine status and is included on the HHS and USDA Select Agent list. S. endobioticum isolates are grouped in pathotypes based on their ability to evade host-resistance in a set of differential potato varieties. So far, thirty-nine pathotypes are reported. A single dominant gene (Sen1) governs pathotype 1 resistance and we anticipated that the underlying molecular model would involve a pathogen effector (AvrSen1) that is recognized by the host. The S. endobioticum specific secretome of fourteen isolates representing six different pathotypes was screened for effectors specifically present in pathotype 1(D1) isolates but absent in others. We identified a single AvrSen1 candidate. Expression of this candidate in potato Sen1 plants showed a specific hypersensitive response, which co-segregated with the Sen1 resistance in potato populations. No HR was obtained with truncated genes found in pathotypes that evaded recognition by Sen1. These findings established that our candidate gene was indeed Avrsen1. The S. endobioticum AvrSen1 is a single copy gene and encodes a 376 amino acid protein without predicted function or functional domains, and is the first effector gene identified in Chytridiomycota, an extremely diverse yet underrepresented basal lineage of fungi.
Original languageEnglish
Pages (from-to)1536-1546
JournalMolecular Plant-Microbe Interactions
Volume32
Issue number11
DOIs
Publication statusPublished - Nov 2019

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Keywords

  • avirulence factors
  • cell death
  • chytridiomycota
  • effector
  • fungus-plant interactions
  • Genomics
  • hypersensitive response
  • metabolomics
  • plant-pathogen interactions
  • population genetics
  • proteomics
  • resistance genes

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