Abstract
Plants constitutively produce a variety of secondary metabolites that have antimicrobial activities against phytopathogens; however, interactions between these performed antimicrobial compounds and phytopathogens were poorly understood. In this study, interactions between epigallocatechin gallate (EGCg), which was a major tea catechin that had antimicrobial activities against varieties of bacteria, and Pseudomonas syringae pv. theae (P.s. theae), the causal of bacterial shoot blight of tea, were investigated. EGCg had less antimicrobial activity against P.s. theae; however, subinhibitory concentrations of EGCg induced biofilm formation. Because biofilms are induced in the presence of sucrose in the culture medium but not by P.s. theae strains deficient in exopolysaccharide levan production, biofilm induction by EGCg and levan production are closely related. EGCg increased survival of P.s. theae under dry conditions on nonwounded leaf surfaces in the presence of sucrose. These data indicate the possibility that tea catechins affect the survival of P.s. theae on the phyllosphere.
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We thank to Dr. Nonaka F, Nonaka T, Nakamaura T, Uchimura K for helpful discussions.
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Tomihama, T., Nishi, Y. & Arai, K. Epigallocatechin gallate, a major tea catechin, induces biofilm formation of Pseudomonas syringae pv. theae . J Gen Plant Pathol 73, 185–192 (2007). https://doi.org/10.1007/s10327-007-0005-0
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DOI: https://doi.org/10.1007/s10327-007-0005-0