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Quantitative resistance differences between and within natural populations of Solanum chilense against the oomycete pathogen Phytophthora infestans
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  • Parvinderdeep Kahlon,
  • Melissa Verin,
  • Ralph Hückelhoven,
  • Remco Stam
Parvinderdeep Kahlon
Technical University of Munich
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Melissa Verin
Technical University of Munich
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Ralph Hückelhoven
Technical University of Munich
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Remco Stam
Technical University of Munich
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Abstract

The wild tomato species Solanum chilense is divided in geographically and genetically distinct populations that show signs of defense gene selection and differential phenotypes when challenged with several phytopathogens, including the oomycete causal agent of late blight Phytophthora infestans. To better understand the phenotypic diversity of this disease resistance in S. chilense and to assess the effect of plant genotype vs. pathogen isolate, respectively, we evaluated infection frequency in a systematic approach and with large sample sizes. We studied 85 genetically distinct individuals representing nine geographically separated populations of S. chilense. This showed that differences in quantitative resistance properties can be observed between but also within populations at the level of individual plants. Data also did not reveal clear indications for complete immunity in any of the genotypes. We further evaluated the resistance of a subset of the plants against P. infestans isolates with diverse virulence properties. This confirmed that the relative differences in resistance phenotypes between individuals were mainly determined by the plant genotype under consideration with modest effects of pathogen isolate used in the study. Thus, our report suggest that quantitative resistance against P. infestans in natural populations of a wild tomato species S. chilense is likely not the result of specific adaptations of hosts to the pathogen but of basal defence responses that depend on the host genotype and are pathogen isolate-unspecific.

Peer review status:ACCEPTED

29 Jan 2021Submitted to Ecology and Evolution
30 Jan 2021Submission Checks Completed
30 Jan 2021Assigned to Editor
02 Feb 2021Reviewer(s) Assigned
27 Feb 2021Review(s) Completed, Editorial Evaluation Pending
01 Mar 2021Editorial Decision: Revise Minor
12 Mar 20211st Revision Received
13 Mar 2021Assigned to Editor
13 Mar 2021Submission Checks Completed
13 Mar 2021Review(s) Completed, Editorial Evaluation Pending
15 Mar 2021Reviewer(s) Assigned
06 Apr 2021Editorial Decision: Revise Minor
07 Apr 20212nd Revision Received
08 Apr 2021Assigned to Editor
08 Apr 2021Submission Checks Completed
08 Apr 2021Review(s) Completed, Editorial Evaluation Pending
09 Apr 2021Editorial Decision: Accept