Effects of drought stress on root physiology of Elymus seedlings
The malondialdehyde,free proline,superoxide dismutase,peroxidase,relative electrical conductivity and catalase of three species of Elymus seedlings root were analyzed by pot seedling cultivation under drought stress.The results showed that malondialde-hyde,free proline and relative electrical conductivity increased with the intensities of drought stress,while the superoxide dismutase,cata-lase and peroxidase decreased first and then increased.Correlation analysis and membership function method were used to evaluate the drought stress of Elymus species seedlings.The order of drought tolerance of Elymus species was:Elymus dahuricum Turcz>Elymus cylin-dricus(Franch.)Honda>Elymus nutans Griseb.