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Effect of salicylic acid treatment on tomato plant physiology and tolerance to potato virus X infection

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Abstract

Salicylic acid (SA) is an inducer of systemic acquired resistance (SAR) and could be a potential candidate in the control of plant virus diseases. In this study we assayed under controlled conditions the potential effect of three doses of exogenous SA treatment on tomato plants infected with Potato virus X (PVX) and measured their effects on: different physiological parameters (gas exchange, stable isotopes, chlorophyll content), the activation of secondary metabolism, viral accumulation and induction of the expression of pathogenesis-related proteins (PRs) such as ß-1, 3-glucanase (PR2) and chitinase (PR3). SA treatment increased the expression of PR2, the activity of phenylalanine ammonia lyase (PAL) and the concentration of antioxidant compounds at 7 days post-treatment. Earlier expression of PR3 compared to PR2 was observed. SA treatment delayed the detection of PVX by ELISA in uninoculated leaves of mechanically infected tomato plants. Although the effect of PVX infection on physiological parameters was weak, moderate SA treatments showed enhanced photosynthesis, particularly for infected plants. The results obtained confirm that SA promotes major changes in the induction of resistance in tomato plants and suggest that treatment with exogenous SA could be considered to reduce the infections caused by PVX.

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Acknowledgments

This work was supported by the MINCYT (project ref. AGL2010-15691). We would like to thank Dr Thierry Candresse of Biologie du Fruit et Pathologie, INRA and Bordeaux University for providing Potato virus X (PVX) (Accession number: AF172259). TF was supported by Torres Quevedo Programme (PTQ-10-02833). JPF was supported by Ramón y Cajal Programme (RYC-2008-02050).

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  1. Departament de Producció Vegetal i Ciència Forestal, Universitat de Lleida, Avda. Rovira Roure 191, 25198, Lleida, Spain

    Tania Falcioni, Juan Pedro Ferrio, Ana Isabel del Cueto, María Ángeles Achón & Vicente Medina

  2. Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Av. Alcalde Rovira Roure, 191, 25198, Lleida, Spain

    Jordi Giné

  3. AGROTECNIO Center, Universitat de Lleida, Avda. Rovira Roure 191, 25198, Lleida, Spain

    Juan Pedro Ferrio, María Ángeles Achón & Vicente Medina

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  1. Tania Falcioni
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Correspondence to Tania Falcioni.

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Falcioni, T., Ferrio, J.P., del Cueto, A.I. et al. Effect of salicylic acid treatment on tomato plant physiology and tolerance to potato virus X infection. Eur J Plant Pathol 138, 331–345 (2014). https://doi.org/10.1007/s10658-013-0333-1

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