| Plant morphological characteristics and changes of physiological and biochemical indexes for Sedum mexicanum were studied under the condition of drought stress. And the heat tolerance was measured by electrical conductivity combined with Logistic equation. The results indicated that: S. mexicanum grew well under the drought stress.With the increase of the drought stress, the leaf relative water content decreased while the electrolyte permeability increased slowly. While the changes of MDA content and soluble sugar content were not obvious mainly reasoned by S.mexicanum with a stronger drought resistance. In addition, the relationship between the temperature for leaf species and the relative electricity conductivity varied in a 耶S爷curve model which was accorded with Logistic equation proved by significance test calculated with the formulas. And the half lethal temperature for S. mexicanum was 62.27益. Compared with the drought resistance indices of other species in Sedum, the drought resistance index for S. mexicanum belongs to better level which indicated that S. mexicanum, a good candidate, was suitable for the roof of the arid environment. |
