Effect of Benzothiadiazole on the Metabolome of Tomato Plants Infected by Citrus Exocortis Viroid

Benzothiadiazole (BTH) is a functional analogue of the phytohormone salycilic acid (SA) involved in the plant immune response. NahG tomato plants are unable to accumulate SA, which makes them hypersusceptible to several pathogens. Treatments with BTH increase the resistance to bacterial, fungal, vir...

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Bibliographic Details
Published in:Viruses 2019-05, Vol.11 (5), p.437
Main Authors: López-Gresa, María Pilar, Payá, Celia, Rodrigo, Ismael, Bellés, José María, Barceló, Susana, Hae Choi, Young, Verpoorte, Robert, Lisón, Purificación
Format: Article
Language:English
Subjects:
Adenosine
Asparagine
Bacterial infections
BTH
defence
Ferulic acid
GABA
Genotypes
Glutamine
Immune response
Infections
Magnetic resonance spectroscopy
Metabolism
Metabolites
metabolomics
NahG plants
NMR
Nuclear magnetic resonance
Pathogenesis
Pathogens
Phenolic compounds
Phenylalanine
Plant immunity
Pospiviroidae
Proteins
Reversion
Seeds
Signal transduction
Spectrum analysis
tomato
Tomatoes
Tyrosine
viroid
Viroids
γ-Aminobutyric acid
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Summary:Benzothiadiazole (BTH) is a functional analogue of the phytohormone salycilic acid (SA) involved in the plant immune response. NahG tomato plants are unable to accumulate SA, which makes them hypersusceptible to several pathogens. Treatments with BTH increase the resistance to bacterial, fungal, viroid, or viral infections. In this study, metabolic alterations in BTH-treated Money Maker and NahG tomato plants infected by citrus exocortis viroid (CEVd) were investigated by nuclear magnetic resonance spectroscopy. Using multivariate data analysis, we have identified defence metabolites induced after viroid infection and BTH-treatment. Glycosylated phenolic compounds include gentisic and ferulic acid accumulated in CEVd-infected tomato plants, as well as phenylalanine, tyrosine, aspartate, glutamate, and asparagine. Besides, an increase of γ-aminobutyric acid (GABA), glutamine, adenosine, and trigonelline, contributed to a clear discrimination between the metabolome of BTH-treated tomato leaves and their corresponding controls. Among them, GABA was the only metabolite significantly accumulated in both genotypes after the chemical treatment. In view of these results, the addition of GABA was performed on tomato plants infected by CEVd, and a reversion of the NahG hypersusceptibility to CEVd was observed, indicating that GABA could regulate the resistance to CEVd induced by BTH.
ISSN:1999-4915
1999-4915
DOI:10.3390/v11050437