Physiological Response of Leymus chinensis with Different Leaf Colors on Drought Stress

摘要

Physiological response abilities of Leymus chinensis with different leaf colors were determinated under drought stress. Soluble sugar content, activity of APX of L. chinensis in five leaf colors all increased along drought stress gradients while MDA content decreased along drought stress gradients. Regression model analysis showed that the relationships between soluble sugar content, MDA content, activity of APX of L. chinensis in five leaf colors and drought stress concentration were significant y=a+bx linear function. Soluble sugar content, the activity of APX increased along leaf color gradients, but MDA content decreased along leaf color gradients. Regression model analysis suggested that the activity of APX, soluble sugar and MDA content and chlorophyll a, chlorophyll b and total chlorophyll contents were significant positive y=ae~(bx) or y=ax~b functions. Therefore, the results suggested that: drought-tolerant ability of L. chinensis was strongly enhanced with the increase of leaf color. There was significant divergent adaptability to drought among different leaf colors L. chinensis.