The aim of this study was to evaluate the levels of shikimic acid and salicylic acid in sugarcane plants after ripener application. Glyphosate was applied at the doses of 400 and 200 mL ha-1, with a dose of 150 mL ha-1 being mixed with sulfumeturon-methylat 12 and 20 g ha-1 and sulfumeturon-methyl at 20 g ha-1.Evaluations were performed at 15 and 30 days after application (DAA) and at 30, 60, 90, 120, and 150 days after sugarcane harvest. The shikimic acid and salicylic acid contents in sugarcane were determined by liquid chromatography and mass spectrometry. The results showed that the glyphosate doses were directly correlated with shikimic acid concentrations in the plants, being higher than the control. An increase in salicylic acid concentration was observed at 30 DAA for all treatments, revealing a process of plant senescence. Higher glyphosate doses led to increased concentrations of shikimic acid and salicylic acid before sugarcane harvest. During plant growth, increases in shikimic acid and salicylic acid levels showed dependence on application of products and on the biotic and abiotic factors to which the culture had been exposed.
shikimic acid; salicylic acid; diseases; physiology
