Dynamic variation of IAA, ABA, CaM and NADase in NewHy Crested Wheatgrass under salt stress

The partial salt tolerance mechanism and partial dynamic variation of intercellular and intracellular signals of NewHy Crested Wheatgrass (NHC) were studied for improving the saline-alkali soil that mainly contains NaCl in Panjin City of Liaoning Province. The seedlings of NHC were cultured with Hoagland nutrient solution, and then, the seedlings were treated with soil salt solution and NaCl salt solution after 3 weeks. The content of IAA, ABA and CaM and the activity of NADKase were tested after treatment. The results indicated that only the content of IAA did not significantly change in 100, 200 mmol/L of soil salt solution and NaCl salt solution but it was different with control; while other physiological indexes increased dramatically with the concentration of salt solution. It could be concluded that NHC activates the Ca2+ signal system through the change of ABA and IAA and increases the content of CaM, then activates NADKase, adjusts cells metabolic activity, so that the tolerance to salt stress could be increased. The threshold concentrations for NHC were 300 mmol/L NaCl salt solution or 200 mmol/L of soil salt solution. The damage of soil salt solution on NHC was greater than NaCl solution under the same concentration.