Effect of drought stress on physiological indexes of 4 Crassulaceae species

In order to select green roof plants in north cold area,the effects of drought stress on 4 Crassulaceae species of physiological indexes were studied,including leaf relative water content,relative electrical conductivity,MDA (malondialdehyde) content,combined with subordinate function comprehensive evaluation of plant drought resistance ability.With the extension of drought stress,S.sarmentosum,H.spectabile and S.kamtschaticum was identified as normal growth and S.hybridum cv.Immergrunchell was identified as inhibited growth by means of morphological evaluation.Leaf relative water content of Sedum leaves decreased.The relative electrical conductivity and MDA content of S.sarmentosum increased slightly which indicated it has high drought resistance.The drought resistance of 4 Crassulaceae species were comprehensive evaluated with subordinate function and their drought resistance order as following:S.sarmentosumH.spectabileS.kamtschaticumS.hybridum cv.Immergrunchell.