Abstract:

To compare the difference of ecophysiological adaptation of four Salix clones, we addressed the dynamic variation of osmotic adjustment and protective enzyme activities of their annual cutting seedlings under persistent drought stress by pot experiments. Results show that relative electrical conductivity and malondialdehyde gradually increase with the increase of drought stress time. Their proline, soluble sugar and activities of peroxidase and superoxide dismutase totally increase. Drought resistance capability of poor drought resistance clones first decreases with the increase of drought stress. We comprehensively evaluate drought resistance of the four Salix clones with principal component analysis based ecophysiological indexes.

Key words: osmotic adjustment, principal component analysis(PCA ) , drought stress')">drought stress, protective enzyme, drought