Fig. 2 Alterations in osmoregulation related signal compounds, total soluble sugar (A) and proline (B), in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.
Fig. 3 Alterations in superoxide level in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.
Fig. 4 Alterations in H2O2 content detected by DAB staining in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.
Fig. 5 Alterations in non-enzymatic antioxidant signal compounds, ascorbate (A) and glutathione (B), in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.
Fig. 6 Alterations in antioxidant enzyme activities, superoxide dismutase, ascorbate peroxidase (A), glutathione reductase, catalase and guaiacol peroxidase (B), in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.
Fig. 7 Alterations in antioxidant enzyme contents, Fe-superoxide dismutase, catalase glutathione peroxidase and glutathione reductase, in the shoots of S. hieraciifolia. Vertical bars represent standard deviations. Different letters denote significant differences among all treatments at P<0.05.