[en] Fusarium oxysporum Fo47 is a biocontrol agent that reduces the symptoms of various diseases in cultivated plants. In this study we used a sterilized culture of Fo47 as elicitor for treating pepper and bean plants before inoculation with the pathogen Phytophthora capsici. Treatment with the sterilized culture of Fo47 reduced significantly the symptoms of the infection by P. capsici in both plants, being a phenomenon of induced resistance. In bean the peroxidase activity was measured; this enzime is classified as a PR protein and is involved in plant defense against pathogens. In addition, the total soluble phenolic compounds and abundance of lignin was determined. Bean plants treated with the sterilized culture of Fo47 and then inoculated with Phytophthora capsici experienced a significant increase in the peroxidase activity; however, there was a significant reduction in total soluble phenolic compounds and the absence of changes in the abundance of lignin. The expression of three defense‐related genes defense in pepper, CABPR1, CASC1 and CAPO1 was analyzed. CABPR1 expression in pepper plants induced with the sterilized culture of Fo47 experienced no significant changes before or after inoculation with Phytophthora capsici. CASC1 significantly increased in pepper plants induced with the sterilized culture of Fo47 and inoculated with pathogen. CAPO1 was significantly reduced in pepper plants induced with sterilized culture of Fo47 in absence of the pathogen. These results show that the sterilized culture of Fo47 causes a response in both crop species, leading to an induced resistance against P. capsici.

[gl] O axente de control biolóxico Fusarium oxysporum Fo47 reduce os síntomas de varias enfermidades en plantas cultivadas. Neste estudo utilizouse un cultivo esterilizado de Fo47 como elicitor para tratar plantas de pemento e feixón que posteriormente foron inoculadas co patóxeno Phytophthora capsici. O tratamento co cultivo esterilizado de Fo47 reduciu significativamente os síntomas da infección por P. capsici en ambas as dúas especies de plantas, constituíndo un fenómeno de resistencia inducida. En feixón determinouse a actividade peroxidasa, unha enzima clasificada como proteína PR implicada na defensa das plantas contra patóxenos, ademáis do contido en compostos fenólicos solubles totais e a abundancia de lignina. As plantas de feixón tratadas co cultivo esterilizado de Fo47 e posteriormente inoculadas con P. capsici experimentaron un aumento significativo na actividade peroxidasa; sen embargo, houbo unha redución significativa en compostos fenólicos solubles totais e a ausencia de alteracións na abundancia de lignina. Analizouse o nivel de expresión de tres xenes relacionados coa defensa de pemento, CABPR1, CASC1 e CAPO1. A expresión de CABPR1 nas plantas de pemento inducidas co cultivo esterilizado de Fo47 nos experimentou cambios significativos nin antes nin despois da inoculación con P. capsici. CASC1 aumentou significativamente nas plantas inducidas co cultivo esterilizado de Fo47 e inoculadas co patóxeno, e CAPO1 reduciuse significativamente nas plantas de pemento tratadas con cultivo esterilizado de Fo47 en ausencia do patóxeno. Estes resultados demostran que o cultivo esterilizado de Fo47 provoca unha resposta en ambas as dúas especies de plantas cultivadas, o que se traduce nunha resistencia inducida fronte a P. capsici.