Fig 1. Effects of different ALA concentrations (0, 0.5, 1, 5, 10 and 25 mg l^-1) on plant growth and cellular membrane damage of E. nutans (DX, Damxung and ZD, Zhengdao) seedlings under chilling stress (5°C).

Plants treated with distilled water under the normal conditions (25°C) served as controls. Each value represents the mean ± SD. Each experiment was repeated at least three times. Bars with different letters are significantly different at the 5% level.