Fig. 6From: The adaptation strategies of Herpetospermum pedunculosum (Ser.) Baill at altitude gradient of the Tibetan plateau by physiological and metabolomic methodsEffects of altitude gradient onanthocyanidin content (ANTH, a) and abscisic acid content (ABA, b) 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 TestBack to article page