Effect of NaCl stress on germination and seedling's antioxidant enzymes activity of Nepeta cataria L.

By the method of filter paper cultivation,some biomass indexes including germination rate,radical length,germ length,fresh weight and some physiological indexes were studied to explore the influence of NaCl( 0 mmol / L,and 25 mmol / L,and50 mmol / L,and 100 mmol / L,and 150 mmol / L,and 200 mmol / L) stress on seed germination and seedling growth of Nepeta cataria L.. The results showed that effects on seed germination rate was not significant under NaCl( 0 mmol / L,and 25 mmol / L,and 50 mmol / L,and 100 mmol / L,and 150 mmol / L,and 200 mmol / L) stress,while these indexes including root length,bud length,fresh weight,the number of cotyledons opened and seed coat drop decreased with the increasing of NaCl concentration,when the concentrations is higher than 100 mmol / L the inhibition was significant. When concentration of NaCl was 25 mmol / L,SOD and POD activity was higher than the control group,while under subsequent stress,concentration activity was lower than the control group,and the anionic oxygen generation showed a corresponding upward trend after the first drop.