Short communication. BRASSINOSTEROID ANALOGUES DIFFERENTIALLY MODIFY PEROXIDASE ACTIVITY, SUPEROXIDE DISMUTASE ACTIVITY AND PROTEIN CONTENT IN TOMATO SEEDLINGS
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Instituto Nacional de Ciencias Agrícolas
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To explore if brassinosteroid (BR) analogues can affect the antioxidant capacity of tomato seedlings, the effect of exogenous application of two brassinosteroid analogues, BB6 and MH5, on peroxidase activity (POX), superoxide dismutase activity (SOD) and protein content three and six days after BR treatment was studied. Leaves from 15-day-old tomato seedlings were sprayed with MH5 (0.01 and 0.05 ppm) and BB6 (0.01 and 0.05 ppm). The changes on SOD and POX activity largely depended on the dosis applied and the type of analogue used. Total protein content was differentially changed by both MH5 and BB6; however, it depended less on the dosis applied and the analogue used. Results strongly suggest that these BR analogues may differentially regulate the antioxidant capacity of tomato seedlings through changes in several enzymatic components of this system depending on the dosis and structure of each analogue used.
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