%0 Journal Article %T Indutores de resist¨ºncia no controle da pinta bacteriana do tomateiro e na atividade de enzimas de defesa Inducers of resistance on the control of tomato bacterial speck and on the activity of defense enzymes %A Camila C.L. Andrade %A Renata S. Resende %A Fabr¨ªcio A. Rodrigues %A Patr¨ªcia R. Silveira %J Tropical Plant Pathology %D 2013 %I Sociedade Brasileira de Fitopatologia %X Em tr¨ºs experimentos, avaliou-se o efeito de pulveriza es de ¨¢cido jasm nico (AJ), etefon (ET) e acibenzolar-S-metil (Bion ) (ASM) a 0,1 mM, 0,5 mM e 0,3 g L-1, respectivamente, nos componentes de resist¨ºncia do tomateiro (cv. Santa Clara) ¨¤ pinta bacteriana, causada por Pseudomonas syringae pv. tomato e na atividade de peroxidases (POX), polifenoloxidases (PFO), ¦Â-1,3-glucanases (GLU) e lipoxigenases (LOX). Apenas no experimento 3, o per¨ªodo de incuba o aumentou significativamente em um dia nas plantas pulverizadas com ASM, em compara o com as plantas pulverizadas com ¨¢gua (controle). O n¨²mero de les es por planta foi significativamente reduzido por AJ, ET e ASM nos tr¨ºs experimentos. Para algumas ¨¦pocas de avalia o, a atividade de POX, PFO e GLU foram maiores para o AJ; de PFO, GLU e LOX, para o ASM; e de GLU e LOX, para o ET em compara o com o controle. Conclui-se que na presen a de AJ, ET e ASM, os sintomas da pinta bacteriana foram reduzidos e a atividade das enzimas POX, PFO, GLU e LOX foram maiores. Three experiments were performed aimed to evaluate the effect of jasmonic acid (JA), ethephon (ET) and acibenzolar-S-methyl (Bion ) (ASM) sprayed at 0.1 mM, 0.5 mM and 0.3 g L-1, respectively, on the components of resistance of tomato plants (cv. Santa Clara) to bacterial speck caused by Pseudomonas syringae pv. tomato as well as on the activity of peroxidases (POX), polyphenoloxidases (PPO), ¦Â-1,3-glucanases (GLU) and lypoxigenases (LOX). Only for experiment 3, the incubation period significantly increased by one day for plants sprayed with ASM compared to plants sprayed with water (control). For all experiments, the number of lesions per plant was significantly reduced by JA, ET and ASM in comparison to the control. For some evaluation times, POX, PPO and GLU activities were higher for JA; PFO, GLU and LOX for ASM; and GLU and LOX for ET in comparison to the control. In conclusion, in the presence of AJ, ET and ASM, bacterial speck symptoms were reduced and the activity of the enzymes POX, PFO, GLU and LOX increased. %K Pseudomonas syringae pv. tomato %K Solanum lycopersicum %K ¨¢cido jasm nico %K acibenzolar-S-metil %K etileno %K Pseudomonas syringae pv. tomato %K Solanum lycopersicum %K acibenzolar-S-methyl %K ethephon %K jasmonic acid %U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1982-56762013000100004