@article{Zárate-Martínez_González-Morales_Ramírez-Godina_Robledo-Olivo_Juárez-Maldonado_2021, title={Effect of phenolic acids on the antioxidant system of tomato plants (Solanum lycopersicum Mill.)}, volume={32}, url={https://revistas.ucr.ac.cr/index.php/agromeso/article/view/45101}, DOI={10.15517/am.v32i3.45101}, abstractNote={<p><strong><span class="CharOverride-2">Introduction. </span></strong>Phenolic acids belong to the group of phenolic compounds, their synthesis and concentration in plants increases when they are under biotic or abiotic stress conditions. <span class="CharOverride-2"><strong>Objective.</strong> </span>To evaluate the effect of phenolic acids on the enzymatic and non-enzymatic antioxidant defense system in tomato plants subjected to biotic stress. <strong><span class="CharOverride-2">Materials and methods. </span></strong>The experiment was carried out from March to December 2016, in Saltillo, Mexico. A tomate crop Saladette type of the Rio Fuego variety (<span class="CharOverride-6"><em>Solanum lycopersicum</em> </span>Mill.) was stablished. Tomato plants inoculated with <em><span class="CharOverride-6">Clavibacter michiganensis </span></em>subsp. <em><span class="CharOverride-6">michiganensis</span></em> (1X105 CFU m<sup>l<span class="CharOverride-4">-1</span></sup>) were foliar sprayed with phenolic acids at a dose of 1 kg ha<sup><span class="CharOverride-4">-1</span></sup> with the Defens Gr® product (IA: phenolic acids 10 000 ppm). Leaves were sampled at 15, 31, and 92 days after the transplantation (ddt) and fruits at 90 ddt. Six treatments were used: 1) absolute control (T0), 2) application of phenolic acids before the inoculation with <em><span class="CharOverride-6">Clavibacter</span></em> (AFA), 3) application of phenolic acids after inoculation with <em><span class="CharOverride-6">Clavibacter</span></em> (AFD), 4) application of phenolic acids before and after inoculation with <span class="CharOverride-6"><em>Clavibacter</em> </span>(AFAD), 5) only application of phenolic acids (AF), and 6) only inoculation with <span class="CharOverride-6"><em>Clavibacter</em> </span>(Cmm). <strong><span class="CharOverride-2">Results.</span></strong> The application of phenolic acids intervened in the activity of enzymatic and non-enzymatic antioxidants. A higher antioxidant capacity was found in leaf than in fruit, which was determined by ABTS (2,2’-azino-bis (3-ethylbenzothiazolin-6-sulfonic acid)) and DPPH (1,1-diphenyl-2-picrilhydrazil). The inoculation of tomato plants increased the activity of catalase and phenylalanine ammonium lyase enzymes in leaf; in addition, there was reduction of superoxide dismutase enzyme activity and total phenol content. <strong><span class="CharOverride-2">Conclusion.</span> </strong>Phenolic acids intervened in the enzymatic defense mechanisms of the plant and reduced the stress levels caused by inoculation.</p>}, number={3}, journal={Agronomía Mesoamericana}, author={Zárate-Martínez, William and González-Morales, Susana and Ramírez-Godina, Francisca and Robledo-Olivo, Armando and Juárez-Maldonado, Antonio}, year={2021}, month={Sep.}, pages={854–868} }