Laminarin-triggered defence responses are geographically dependent in natural populations of Solanum chilense

Author:

Kahlon Parvinderdeep S1ORCID,Förner Andrea1,Muser Michael1,Oubounyt Mhaned2ORCID,Gigl Michael3,Hammerl Richard3ORCID,Baumbach Jan24ORCID,Hückelhoven Ralph1ORCID,Dawid Corinna3ORCID,Stam Remco5ORCID

Affiliation:

1. Chair of Phytopathology, TUM School of Life Sciences, Technical University of Munich , Emil-Ramann-Str. 2, 85354, Freising , Germany

2. Research Group of Computational Systems Biology, University of Hamburg , Notkestrasse 9, 22607, Hamburg , Germany

3. Chair of Food Chemistry and Molecular Sensory Science, TUM School of Life Sciences, Technical University of Munich , Lise-Meitner-Str. 34, 85354 Freising , Germany

4. Computational BioMedicine lab, Institute of Mathematics and Computer Science, University of Southern Denmark , Campusvej 55, Odense , Denmark

5. Department of Phytopathology and Crop Protection, Institute for Phytopathology, Kiel University , Hermann Rodewald Str 9, 24118 Kiel , Germany

Abstract

Abstract Natural plant populations are polymorphic and show intraspecific variation in resistance properties against pathogens. The activation of the underlying defence responses can depend on variation in perception of pathogen-associated molecular patterns or elicitors. To dissect such variation, we evaluated the responses induced by laminarin (a glucan, representing an elicitor from oomycetes) in the wild tomato species Solanum chilense and correlated this to observed infection frequencies of Phytophthora infestans. We measured reactive oxygen species burst and levels of diverse phytohormones upon elicitation in 83 plants originating from nine populations. We found high diversity in basal and elicitor-induced levels of each component. Further we generated linear models to explain the observed infection frequency of P. infestans. The effect of individual components differed dependent on the geographical origin of the plants. We found that the resistance in the southern coastal region, but not in the other regions, was directly correlated to ethylene responses and confirmed this positive correlation using ethylene inhibition assays. Our findings reveal high diversity in the strength of defence responses within a species and the involvement of different components with a quantitatively different contribution of individual components to resistance in geographically separated populations of a wild plant species.

Funder

German Research Foundation

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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