Fig. 1From: Physiological effects of the combined stresses of freezing-thawing, acid precipitation and deicing salt on alfalfa seedlingsCombined effects of freezing-thawing, deicing salt and acid precipitation on the MDA content in alfalfa seedlings (means ± SEs, n = 3). The numbers from 2 ~ 14 h represent different temperatures corresponding to 10, 5, 0, − 5, 0, 5, and 10 °C. CK represents the control group. The letters A, D and F represent the acid precipitation treatment, deicing salt treatment and freeze-thaw treatment, respectively. The different letters indicate significant differences among the various treatments (P < 0.05)Back to article page