2.2. Alkaline-stress treatment and ABA application
We used Naco, at 15 mM, which had EC- 2.76*0.003 ms/cm to simulate alkaline stress (I et al. 2013) pH-10.87*0.033, and The EC and pH of the solutions were measured using conductivity meter DDs-12 (Lida In.Shanghai, China) and pH meter PHS-25 (Bayuan In. Beijing, China) respectively