Abstract
In this study, an approach based on seed treatment was undertaken to enhance resistance of Nicotiana benthamiana against wild fire disease caused by Pseudomonas syringae pv. tabaci. Seeds soaked in 10 μg ml−1 of three hemi-synthetic triterpenes (F3, F4 and F6) derived from the latex of Euphorbia officinarum and Euphorbia resinifera resulted in plants with reduced disease severity, which was correlated with a decrease of bacterial populations in planta. Analysis of plant defense markers revealed that H2O2 and guaiacol peroxidase were only slightly activated but were primed after pathogen infiltration. However, polyphenol oxidase, catalase and ascorbate peroxidase were directly induced by the triterpenic derivatives. These results underline the duality of the mode of action of the triterpenic compounds and suggest their use as plant defense inducers in crop protection.
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Smaili, A., Mazoir, N., Aicha Rifai, L. et al. Induced resistance to wild fire disease of Nicotiana benthamiana using seed treated with triterpene derivatives from Euphorbia. J Plant Pathol 100, 75–83 (2018). https://doi.org/10.1007/s42161-018-0031-0
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DOI: https://doi.org/10.1007/s42161-018-0031-0