Population studies of the wild tomato species Solanum chilense reveal geographically structured major gene-mediated pathogen resistance

Parvinderdeep S. Kahlon, Shallet Mindih Seta, Gesche Zander, Daniela Scheikl, Ralph Hückelhoven, Matthieu H.A.J. Joosten, Remco Stam*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

Natural plant populations encounter strong pathogen pressure and defence-associated genes are known to be under selection dependent on the pressure by the pathogens. Here, we use populations of the wild tomato Solanum chilense to investigate natural resistance against Cladosporium fulvum, a well-known ascomycete pathogen of domesticated tomatoes. Host populations used are from distinct geographical origins and share a defined evolutionary history. We show that distinct populations of S. chilense differ in resistance against the pathogen. Screening for major resistance gene-mediated pathogen recognition throughout the whole species showed clear geographical differences between populations and complete loss of pathogen recognition in the south of the species range. In addition, we observed high complexity in a homologues of Cladosporium resistance (Hcr) locus, underlying the recognition of C. fulvum, in central and northern populations. Our findings show that major gene-mediated recognition specificity is diverse in a natural plant-pathosystem. We place major gene resistance in a geographical context that also defined the evolutionary history of that species. Data suggest that the underlying loci are more complex than previously anticipated, with small-scale gene recombination being possibly responsible for maintaining balanced polymorphisms in the populations that experience pathogen pressure.
Original languageEnglish
Article number20202723
JournalProceedings of the Royal Society B: Biological Sciences
Volume287
Issue number1941
DOIs
Publication statusPublished - 23 Dec 2020

Keywords

  • Cladosporium fulvum
  • loss of resistance
  • major gene resistance
  • Solanum chilense
  • tomato

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