Effects of salt stress on membrane permeability and enzymes system of Kochia prostrata seedling

Membrane permeability, malondialdehyde (MDA) contents and activities of antioxidant enzymes in Kochia prostrata seedlings were studied under different concentrations of salt stress. The result showed that the membrane permeability and MDA contents increased with the increasing of salt concentrations. Compared with CK, a significant (P0.01) increase in membrane permeability was observed when salt concentration was higher 150 mmol/L; and a remarkable (P0.05) increase in MDA occurred under 300 mmol/L salt concentration. The activity of SOD decreased at 400 mmol/L salinity concentration, but it showed a single peak curve under other treatments and a significant (P0.05) difference was observed when salinity stress was more than 200 mmol/L. Compared with SOD, there was slight change of POD in K. prostrata seedling; a remarkable (P0.01) change was observed 25 days after the treatment. No significant difference was obtained when salt concentration less than 400 mmol/L. CAT showed a similar change with SOD.