Effect of salt stress on Na+、K+、proline、soluble sugar and protein of NHC

The changes of osmotic regulators and salt tolerance mechanism of NewHy Crested Wheatgrass (NHC) under salt stress were studied aiming at improving the salinealkali soil that mainly contains NaCl in Coastal Industry Quarter of Yingkou city in Liaoning province. Seedlings of NHC were cultivated with 1/2 Hoagland nutrient solution, and treated with NaCl solution after 3 weeks. Results showed that under 100, 200 mmol/L soil salt solution and NaCl solution, all physiological indexes increased evidently, except root K+ / leaf K+ and soluble protein content. All physiological indexes fluctuated evidently under 300 mmol/L of NaCl solution; and plants died after 7 days of 300 mmol/L soil salt solution treatment. In conclusion, NHC enhanced salt tolerance through increasing root Na+/leaf Na+, proline content, soluble sugars and soluble proteins. The maximum permissible salt concentration for NHC was 300 mmol/L NaCl solution or 200 mmol/L of soil salt solution.