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A comparison of PTI defense profiles induced in Solanum tuberosum by PAMP and non-PAMP elicitors shows distinct, elicitor-specific responses

Abstract : The induction of general plant defense responses following the perception of external elicitors is now regarded as the first level of the plant immune response. Depending on the involvement or not of these molecules in pathogenicity, this induction of defense is called either Pathogen-Associated Molecular Pattern (PAMP) Triggered Immunity or Pattern Triggered Immunity-both abbreviated to PTI. Because PTI is assumed to be a widespread and stable form of resistance to infection, understanding the mechanisms driving it becomes a major goal for the sustainable management of plant-pathogen interactions. However, the induction of PTI is complex. Our hypotheses are that (i) the recognition by the plant of PAMPsvsnon-PAMP elicitors leads to specific defense profiles and (ii) the responses specifically induced by PAMPs target critical life history traits of the pathogen that produced them. We thus analyzed, using a metabolomic approach coupled with transcriptomic and hormonal analyses, the defense profiles induced in potato foliage treated with either a Concentrated Culture Filtrate (CCF) fromPhytophthora infestansor two non-PAMP preparations, beta-aminobutyric acid (BABA) and anUlvaspp. Extract, used separately. Each elicitor induced specific defense profiles. CCF up-regulated sesquiterpenes but down-regulated sterols and phenols, notably alpha-chaconine, caffeoyl quinic acid and rutin, which decreased spore production ofP.infestans in vitro. CCF thus induces both defense and counter-defense responses. By contrast, theUlvaextract triggered the synthesis of a large-spectrum of antimicrobial compounds through the phenylpropanoid/flavonoid pathways, while BABA targeted the primary metabolism. Hence, PTI can be regarded as a heterogeneous set of general and pathogen-specific responses triggered by the molecular signatures of each elicitor, rather than as a uniform, non-specific and broad-spectrum set of general defense reactions.
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https://hal.inrae.fr/hal-03140208
Contributor : Anne-Sophie Grenier <>
Submitted on : Friday, February 12, 2021 - 4:09:30 PM
Last modification on : Monday, May 31, 2021 - 9:02:06 AM

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Rafaela Lopes Martin, Pauline Le Boulch, Pauline Clin, Adrian Schwarzenberg, Jean-Claude Yvin, et al.. A comparison of PTI defense profiles induced in Solanum tuberosum by PAMP and non-PAMP elicitors shows distinct, elicitor-specific responses. PLoS ONE, Public Library of Science, 2020, 15 (8), pp.e0236633. ⟨10.1371/journal.pone.0236633⟩. ⟨hal-03140208⟩

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