To investigate the effect of super absorbent polymer (SAP) on physiology of Magnolia officinalis, 3 types of SAPs, inclu-ding sodium (Na), potassium (K) and multifunctional (X) were added to one-year-old seedlings, and changes in antioxidant enzyme activities, lipid peroxidation and accumulation of osmoregulation substances in both drougt ( D) and regularly irrigated groups were recorded. Results showed that contents of malondialdehyde ( MDA) and O-·2 significantly increased in 4 drought groups (P<0.05). H2O2 and all enzymes including catalase (CAT), peroxidase (POD), superoxide dismutase (SOD) and ascorbate peroxidase ( APX) in leaves increased significantly in groups of control under drought ( N+D) and Na-SAP under drought ( Na+D) . Accumulations of soluble protein, proline and soluble sugar all increased under drought stress ( P<0.05) . Under drought stress, magnolol and honokiol levels elevated to some extent except staying the same in group Na+D, however, their levels increased signifi-cantly in groups of K+D. In conclusion, both K-and X-SAPs ameliorated drought stress for M.officinalis seedlings in terms of accu-mulated osmoregulation substances, enhanced activities of antioxidant enzymes, and mitigated membrane lipid peroxidation. More importantly, the main medicinal componds, magnolol and honokiol increased when K-SAP was applied.
国家科技期刊平台
NSTL
维普
万方数据
