Hexanoic acid is a resistance inducer that protects tomato plants against Pseudomonas syringae by priming the jasmonic acid and salicylic acid pathways

Abstract

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Estudio integral de los mecanismos de resistencia inducida. Inductores frente a estrés biótico y abiótico

“…cinerea (Angulo et al, 2015). syringae (Vicedo et al, 2009;Scalschi et al, 2013). In addition, recent reports showed the role of OPDA in the pathogen-induced callose accumulation (Scalschi et al, 2015).…”

“…Moreover, Hx treatment has been reported to protect tomato plants against hemi-biotrophic bacterium P.syringae pv tomato DC3000 (Vicedo et al, 2009). Recently, some studies have revealed that in this pathosystem, Hx treatment seems to counteract the negative effect of pathogen coronatine (COR), which requires JA-Ile on the SA pathway (Scalschi et al, 2013 (Britto and Kronzucker, 2002). This may include leaf chlorosis, lower plant yield production and root/shoot ratio, lower cation content, acidification of the rhizosphere, and changes in several metabolite levels, such as amino acids or organic acids (Britto and Kronzucker, 2002;Bittsánszky et al, 2015).…”

“…Among them, hexanoic acid (Hx) is a potent priming agent within a wide range of host plants and pathogens (Aranega et al, 2014). Treating roots of tomato plants with Hx protects them against necrotrophic fungi B. cinerea (Vicedo et al, 2009) and the hemibiotrophic bacterium Pseudomonas syringae pv tomato (Scalschi et al, 2013). Hx can early activate broad-spectrum defenses by inducing callose deposition, in addition to the SA and oxylipin pathways.…”

“…2b) We tested the efficacy of Hx treatment as an inducer of resistance in melon plants against MNSV. Based on previous data of Hx-IR in tomato plants against B. cinerea and P. syringae (Leyva et al, 2008;Vicedo et al, 2009;Scalschi et al, 2013), we set up Hx treatments in melon plants, which were applied by either foliar spray or soil drench. We checked different concentrations and patterns of treatment applications (Fig.…”

“…The third and fourth leaves were inoculated with Pst collected from the plants at 1 and 3 hpi and placed on glass slides with the adaxial epidermis in contact with dental resin. The dental resin mold was filled with nail polish to create a cast that was examined by light microscopy (Scalschi et al, 2013). For stomatal aperture analysis, images of random regions were taken using a Leica IRB microscope equipped with a LeicaDC300F camera (Leica Microsystems CMS GmbH, Wetzlar, Germany).…”