Rios, Jonas AlbertoRodrigues, Fabrício ÁvilaDebona, DanielResende, Renata SousaMoreira, Wiler RibasAndrade, Camila Cristina Lage2019-10-032019-10-032014-051983-2052http://dx.doi.org/10.1590/S1982-56762014000300006https://locus.ufv.br//handle/123456789/27225This study investigated the effects of acibenzolar-S-methyl (ASM), ethylene (ET) and jasmonic acid (JA) on the resistance of two wheat cultivars (BRS-229 and BR-18) to infection by Pyricularia oryzae. The treatments included spraying plants with ASM (300 mg L-1), ET (0.5 mM), JA (0.1 mM) and distilled water (control) 48 h before inoculation with P. oryzae. Malondialdehyde concentration, an indicative of oxidative damage to the lipids in the leaf cells, was significantly higher for plants sprayed with ASM compared to plants sprayed with JA and ET. Plants sprayed with JA and ET showed reduced values for the number of lesions per cm2 of leaf area and area under blast progress curve, but these hormones had no effect on the incubation period and lesion size (in mm). Plants sprayed with JA and ET showed reduce blast symptoms in comparison to plants sprayed with ASM due to greater peroxidase, polyphenoloxidase, chitinase and β-1,3-glucanase activities.pdfengOpen AccessTriticum aestivumBlastHormonesHost defense responsesArtigo