TY - JOUR N2 - Plants can recognize molecules derived from pathogens and trigger systemic acquired resistance (SAR). In phytopathogenic bacteria, elicitors are constituent components of cellular structures, such as flagellin. We sought to select structural components of Xanthomonas spp. incompatible with tomato, aiming to control bacterial spot ( Xanthomonas perforans). Initially, cell suspensions from 11 Xanthomonas spp. isolates were infiltrated into the leaves to assess their ability to cause a hypersensitivity response (HR) and the incompatible ones had their flagellin purified. The flagellin of the isolates were first applied at different concentrations, via infiltration and spraying. The pathogen, X. perforans, was inoculated after 24 h, to assess whether there would be any harmful reaction. No harmful reaction was observed in any treatment. Then, a second experiment was conducted to assess the severity of all isolates, at a concentration of 8.35 μg · ml–1, via spraying, infiltration, and soil. The greatest reduction in Area Under the Disease Progress Curve (AUDPC) was observed in the treatment with XapRR, applied via spraying. Thus, prospecting for elicitors is the first step in developing a product for agricultural use. The flagellin elicitor of XapRR is promising and capable of producing these molecules on a large scale. L1 - http://www.czasopisma.pan.pl/Content/120038/OA_09_JPPR_61_2_0940_Simoes.pdf L2 - http://www.czasopisma.pan.pl/Content/120038 PY - 2021 IS - No 2 EP - 188 DO - 10.24425/jppr.2021.137029 KW - hypersensitivity response KW - incompatibility KW - phytopathogenic bacteria KW - Xanthomonas euvesicatoria pv. perforans A1 - Simões, Camila Tonelotti A1 - Carvalho, Valdeir Nunes A1 - Halfeld-Vieira, Bernardo de Almeida PB - Committee of Plant Protection PAS PB - Institute of Plant Protection – National Research Institute VL - vol. 61 DA - 2021.06.28 T1 - Prospecting of pathogen-derived elicitors for the control of tomato bacterial spot SP - 183 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/120038 T2 - Journal of Plant Protection Research ER -