Detoxification of Cr(VI) in Salvinia minima is related to seasonal-induced changes of thiols, phenolics and antioxidative enzymes

► Cr(VI) induces oxidative stress in Salvinia leaves. ► Cr(VI) is mostly accumulated in submerged leaves. ► MDA increases in Cr-treated leaves. ► Antioxidative enzymes increase by Cr(VI). ► Phenolics and thiols vary inversely under Cr(VI).