Population Studies of the Wild Tomato Species Reveal Geographically Structured Major Gene-mediated Pathogen Resistance

Overview

Journal Proc Biol Sci

Specialty Biology

Date 2020 Dec 22

PMID 33352079

Citations 7

Authors

Parvinderdeep S Kahlon

Shallet Mindih Seta

Gesche Zander

Daniela Scheikl

Ralph Huckelhoven

Matthieu H A J Joosten

Remco Stam

Affiliations

Soon will be listed here.

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 to investigate natural resistance against , 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 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 () locus, underlying the recognition of 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.

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