Fig. 4

Effects of altitude gradient on the values of total glutathion content (a), total ascorbate content (b), GSSG content (c), ASA content (d), GSH/GSSG ration (e) and ASA/DHA ration (f) in leaves of Herpetospermum pedunculosum (Ser.) Baill. The plant samples were selected from different altitude (2800 m, 3000 m, 3100 m and 3300 m), respectively. Different letters above bars indicate statistically significant differences between different altitudes at P < 0.05 according to Duncan’s multiple range Test. Significant differences P < 0.01 are indicated two asterisks