Effect of drought stress on physiological indexes of 5 Sedum species

Physiological response mechanism of Sedum was studied with five Sedums, which aimed to provide theoretical basis for selecting low cost and suitable plants of green roofs. In this study, five Sedums were exposed to drought stress (without irrigation) for 28 days. All measurements were determined in seven days intervals, including leaf water content, relative electric conductivity, malondialdehyde(MDA), superoxide dismutase(SOD) and proline(Pro).The results indicated that leaf water content decreased significantly with increase of the stress time, while relative electric conductivity, MDA and Pro increased, however, SOD activities were raised first and declined continually later. Through comprehensive analysis, it was concluded that the drought resistant abilities of these five sedums ordered as Sedum sarmentosum＞S.lineare＞S. lineare cv. Jin Ye＞S. emarginatum＞S.spurium cv. Coccineum.