The regulatory mechanism of soil cadmium(Cd)on antioxidases in sorghum was studied using 3 sorghum species viz.,sweet sorghum [Sorghum bicolor(L.)] Moench.cv.Hunnigreen,sorghum hybrid sudangrass(Sorghum bicolor × S.sudanense,cv.Everlush)and sudangrass [Sorghum sudanense(Piper)Stapf cv.Xinjiang].The results showed that low concentrations of Cd2+(10 mg kg-1)induced the activities of 4 antioxidases in leaves of the 3 species of sorghum,but high Cd2+ concentrations(50 mg kg-1)significantly reduced the activities of all the four antioxidases.The glutathione(GSH)contents in leaves of the 3 species of sorghum correlated positively with the Cd2+ concentrations.The maximum antioxidase activities were observed at the elongation stage of sorghum during the whole growth period.
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