Resumen

ALVAREZ MORINIGO, Francisco Tomás  y  GRABOWSKI OCAMPOS, Cristhian. Induction of resistance to the bacterial spot (Xanthomonas campestris pv. sesami) in sesame (Sesamum indicum L.) plants. Investig. Agrar. [online]. 2013, vol.15, n.2, pp.97-105. ISSN 2305-0683.

Induction of resistance is the activation of latent mechanisms that are expressed after exposure of plants to suitable products or substances (elicitors). To determine the potential inductor effect of the Ka’a he’e extract, a commercial product with a mixture of trace elements and plant extracts, Acibenzolar-s-methyl (ASM) and Fosetyl-Al, against the bacterial spot caused by Xanthomonas campestris pv. sesami (Xcs), there were evaluated in vitro bacteria growth and the intensity of disease in sesame plants. For in vitro tests there were used antibiogram and serial dilution, using a completely randomized design with 5x4 factorial arrangement and four replications, main factor being the products and secondary factors the concentrations and dilutions. To determine the intensity of bacterial spot, plant leaves were scanned and severity was quantified with the Assess 2.0 software, the experimental design was completely randomized with six treatments, the four products, a chemical control (copper oxychloride + mancozeb ) and an absolute control (water only). The Ka´a he´e extract and ASM are considered resistance inducers because they not exert direct anti-microbial action on Xcs and reduce the intensity of bacterial spot in sesame plants. The Fosetyl-Al and the product with a mix of trace elements and plant extracts are not considered resistance inducers because they have antimicrobial activity in vitro and do not significantly reduce the severity of bacterial spot.

Palabras clave : Induction of resistance; bacterial spot; Xanthomonas campestris.

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