Comparison Of Changes In Protective Enzymes And Metabolites And Drought Tolerance Of Several Species Of Desert Plants

In this paper,the eight species of sand plants,Salix psammophila C.Wang et Ch.Y.Yang,Salix cheilophila Schneid,Salix gordejevii Y.L.Chang et Sk V.,Amorpha fruticosa Linn.,Ampelopsis aconitifolia Bunge,Berberis thunbergii DC.,Periploca sepium Bunge in Mem.Acad,and Elaeagnus angustifolia Linn will be studied,By studying the changes of metabolites(MDA,pro)and protective enzymes(SOD,POD)of eight species of desert plants under drought stress,a comprehensive comparison was performed using membership functions to screen for drought tolerance Strong tree species,research results show:(1)Under drought stress,the protective enzymes of different plants show some differences: With the deepening of the drought,the SOD activity of P.chinensis,A.fruticosa,Salix psammophila,and Ampelopsis aconitifolia gradually increased,and the activities of SOD in other four plants increased first and then decreased;The POD activity of E.armenioides and S.vulgaris increased gradually,and POD activity of Salix gordejevii gradually decreased.The POD activity of the other five plants increased first,then decreased and then increased.(2)Under drought stress,the MDA content of different plants gradually increased.Changes in Pro content show some differences: With the deepening of the drought,the Pro content of Salix gordejevii will increase gradually,and the Pro content of Periploca sepium,Amorpha fruticosa,Salix psammophila increased first,then decreased and then increased.The Pro content of Salix cheilophila,Berberis thunbergii,Elaeagnus angustifolia,and Ampelopsis aconitifolia was increased first and then decreased.There is no consistent rule for the change of Pro content accumulation in different tree species under different degrees of drought.(2)The significance of proline in the study of drought resistance of plants In future experiments,further research and analysis should be conducted according to the selected plant and its environment.(3)Because the moisture did not remain in the same horizontal interval during the experiment,the order of membership functions in the low-moisture zone was selected.Combined with the natural distribution and site characteristics of the six plants in the interval,the drought-tolerance ranking was carried out: Amorphafruticosa Linn.> Periploca sepium Bunge in Mem.Acad.> Berberis thunbergii DC.> Salix psammophila C.Wang et Ch.Y.Yang.> Salix gordejevii Y.L.Chang et SkV.> Salix cheilophila Schneid.