Journal of Plant Diseases and Protection (2021) 128, 989-998

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Mara Quaglia, Marika Bocchini, Benedetta Orfei, Roberto D'Amato, Franco Famiani, Chiaraluce Moretti and Roberto Buonaurio (2021)
Zinc phosphate protects tomato plants against Pseudomonas syringae pv. tomato
Journal of Plant Diseases and Protection 128 (4), 989-998
Abstract: The purpose of this study was to determine whether zinc phosphate treatments of tomato plants (Solanum lycopersicum L.) can attenuate bacterial speck disease severity through reduction of Pseudomonas syringae pv. tomato (Pst) growth in planta and induce morphological and biochemical plant defence responses. Tomato plants were treated with 10 ppm (25.90 µM) zinc phosphate and then spray inoculated with strain DAPP-PG 215, race 0 of Pst. Disease symptoms were recorded as chlorosis and/or necrosis per leaf (%) and as numbers of necrotic spots. Soil treatments with zinc phosphate protected susceptible tomato plants against Pst, with reductions in both disease severity and pathogen growth in planta. The reduction of Pst growth in planta combined with significantly higher zinc levels in zinc-phosphate-treated plants indicated direct antimicrobial toxicity of this microelement, as also confirmed by in vitro assays. Morphological (i.e. callose apposition) and biochemical (i.e., expression of salicylic-acid-dependent pathogenesis-related protein PR1b1 gene) defence responses were induced by the zinc phosphate treatment, as demonstrated by histochemical and qPCR analyses, respectively. In conclusion, soil treatments with zinc phosphate can protect tomato plants against Pst attacks through direct antimicrobial activity and induction of morphological and biochemical plant defence responses.
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Full text of article
Database assignments for author(s): Mara Quaglia, Chiaraluce Moretti, Roberto Buonaurio

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pseudomonas syringae pv. tomato Tomato (Solanum lycopersicum) Italy
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