Acibenzolar-S-mtil e Elife® na indução de respostas de defesa do tomateiro contra a mancha bacteriana (Xanthomonas vesicatoria)

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Abstract

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.

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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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