Induction of resistance to Pyricularia oryzae in wheat by acibenzolar-S-methyl, ethylene and jasmonic acid

Abstract

This 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 cm 2 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.

Silicon, acibenzolar-S-methyl and potassium phosphite in the control of brown spot in rice

“…In this way, finding alternative methods for brown spot management is necessary to avoid the yield losses caused by this disease (Dallagnol et al 2011;Rezende et al 2009). In light of these concerns, the supply of silicon (Si) and the use of inducers of resistance to crops of economical importance, such as rice, are shown as an environmentally friendly choice considering the potential of these products to decrease the intensities of important diseases (Araujo et al 2008(Araujo et al , 2015(Araujo et al , 2016Rios et al 2014;Rodrigues et al 2003Rodrigues et al , 2004Rodrigues et al , 2005.…”

“…In contrast, the ISR is not related to PR-protein accumulation, is induced by biotic elicitors, and is signaled via the hormones ethylene and jasmonic acid (Knoester et al 1999;Métraux 2001;Ryals et al 1994;Vallad and Goodman 2004). In this context, some compounds such as the acibenzolar-S-methyl (ASM) and potassium phosphite (Phi) have shown the potential to induce resistance in different plants against pathogens (Araujo et al 2008(Araujo et al , 2015Babu et al 2003;Rios et al 2014;Schurt et al 2013).…”

“…The ASM, an analog of the salicylic acid, is a synthetic molecule capable to activate SAR in annual and perennial crops (Araujo et al 2015;Babu et al 2003;Rios et al 2014;Vallad and Goodman 2004). The ASM can systemically activate resistance to various pathogens in many plant species by enhancing the expression of PR-proteins and increasing the concentration of secondary metabolites (Araujo et al 2015;Babu et al 2003;Rios et al 2014;Vallad and Goodman 2004).…”

“…The ASM can systemically activate resistance to various pathogens in many plant species by enhancing the expression of PR-proteins and increasing the concentration of secondary metabolites (Araujo et al 2015;Babu et al 2003;Rios et al 2014;Vallad and Goodman 2004). In rice, the ASM showed its potential to reduce the severity of sheath blight and bacterial blight caused, respectively, by Rhizoctonia solani and Xanthomonas oryzae pv.…”

“…The induced synthesis of PR-proteins and secondary metabolites in plants supplied with Si or when exposed to exogenous spray of ASM and Phi has been investigated for many host-parasite interactions (Araujo et al 2015(Araujo et al , 2016Babu et al 2003;Guerra et al 2013;Liang et al 2005;Rios et al 2014;Rodrigues et al 2003Rodrigues et al , 2004Rodrigues et al , 2005Rohilla et al 2001;Tatagiba et al 2014). The increase in the activities of peroxidases (POX), polyphenoloxidases (PPO), phenylalanine ammonialyases (PAL), chitinases (CHI), β-1,3-glucanases (GLU), and lypoxigenases (LOX) is one of the most common and efficient defense mechanism activated after the recognition of a pathogen by its host (Van Loon et al 2006).…”