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Open AccessArticle

Metabolomics to Exploit the Primed Immune System of Tomato Fruit

1
School of Biosciences, Uni. Birmingham, Birmingham B15 2TT, UK
2
UMR BFP, University Bordeaux, INRAE, 33882 Villenave d’Ornon, France
3
Bordeaux Metabolome, MetaboHUB, PHENOME-EMPHASIS, 33140 Villenave d’Ornon, France
*
Author to whom correspondence should be addressed.
Metabolites 2020, 10(3), 96; https://doi.org/10.3390/metabo10030096
Received: 14 February 2020 / Revised: 3 March 2020 / Accepted: 4 March 2020 / Published: 6 March 2020
(This article belongs to the Special Issue Fruit Metabolism and Metabolomics)
Tomato is a major crop suffering substantial yield losses from diseases, as fruit decay at a postharvest level can claim up to 50% of the total production worldwide. Due to the environmental risks of fungicides, there is an increasing interest in exploiting plant immunity through priming, which is an adaptive strategy that improves plant defensive capacity by stimulating induced mechanisms. Broad-spectrum defence priming can be triggered by the compound ß-aminobutyric acid (BABA). In tomato plants, BABA induces resistance against various fungal and bacterial pathogens and different methods of application result in durable protection. Here, we demonstrate that the treatment of tomato plants with BABA resulted in a durable induced resistance in tomato fruit against Botrytis cinerea, Phytophthora infestans and Pseudomonas syringae. Targeted and untargeted metabolomics were used to investigate the metabolic regulations that underpin the priming of tomato fruit against pathogenic microbes that present different infection strategies. Metabolomic analyses revealed major changes after BABA treatment and after inoculation. Remarkably, primed responses seemed specific to the type of infection, rather than showing a common fingerprint of BABA-induced priming. Furthermore, top-down modelling from the detected metabolic markers allowed for the accurate prediction of the measured resistance to fruit pathogens and demonstrated that soluble sugars are essential to predict resistance to fruit pathogens. Altogether, our results demonstrate that metabolomics is particularly insightful for a better understanding of defence priming in fruit. Further experiments are underway in order to identify key metabolites that mediate broad-spectrum BABA-induced priming in tomato fruit. View Full-Text
Keywords: tomato; metabolomics; biochemical phenotyping; priming; BABA; Botrytis cinerea; Phytophthora infestans; Pseudomonas syringae tomato; metabolomics; biochemical phenotyping; priming; BABA; Botrytis cinerea; Phytophthora infestans; Pseudomonas syringae
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Luna, E.; Flandin, A.; Cassan, C.; Prigent, S.; Chevanne, C.; Kadiri, C.F.; Gibon, Y.; Pétriacq, P. Metabolomics to Exploit the Primed Immune System of Tomato Fruit. Metabolites 2020, 10, 96.

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