The efficacy of acibenzolar-S-methyl (ASM) and Ecolife® and the activation of some defense responses against Xanthomonas vesicatoria were investigated in the current work. Tomato plants cv. Santa Cruz Kada were sprayed with acibenzolar S-methyl (0.2 g l -1 ASM and a citric biomass formulation called Ecolife® (5 ml l -1). Plants were challenged with a virulent Xanthomonas vesicatoria isolate four days after spraying. Foliar pulverization of Ecolife® and ASM caused disease reduction of 39.2% and 47.7%, respectively. The expression of resistance induced by ASM and Ecolife® was evidenced by the increase at peroxidase (POX) and polyphenol oxidase (PPO) activities, starting in the first hours after spraying. Despite the slight decrease in phenylalanine ammonia-lyase (PAL) activity three days after spraying, plants treated with ASM or Ecolife® and inoculated with X. vesicatoria showed a slight increase in lignin deposits. The content of total soluble phenolic compounds decreased significantly at 9 and 12 days after spraying. Increased POX and PPO activities might result in lignification, which may be associated with the tomato's defense strategy against bacterial leaf spot.
CITATION STYLE
Cavalcanti, F. R., Resende, M. L. V., Zacaroni, A. B., Ribeiro, P. M., Costa, J. D. C. B., & De Souza, R. M. (2006). Acibenzolar-S-mtil e Elife® na indução de respostas de defesa do tomateiro contra a mancha bacteriana (Xanthomonas vesicatoria). Fitopatologia Brasileira, 31(4), 372–380. https://doi.org/10.1590/S0100-41582006000400007
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