胭脂红景天引种至西藏日喀则其渗透调节物质及保护酶活性的变化

胭脂红景天叶片呈胭脂红色，花开红色，具有极强的耐寒性和耐旱性，是优良的城市绿化植物。为了扩大胭脂红景天的应用范围，丰富恶劣生境的绿化材料，本试验对从哈尔滨引种到西藏日喀则表现良好的胭脂红景天进行了生理适应性研究。结果表明，随着栽植时间的延长，胭脂红景天叶片中丙二醛含量逐渐升高，但增加的幅度较小，脯氨酸含量先降低后升高，SOD、POD、CAT等保护酶的活性均呈先升高后降低的趋势。胭脂红景天可以通过增加体内渗透调节物质含量和提高保护酶活性来调节自身的生理代谢，适应日喀则地区高辐射、干旱等条件。

Changes of Osmotic Adjustment Substances and Activities of Protective Enzymes in Sedum spurium ‘Coccineum’ Introduced to Xigaze,Tibet

Sedum spurium ‘Coccineum’ has carmine leaves and red flowers, which is an excellent urban greening plant with strong cold and drought tolerance. In order to expand its application range and enrich the greening materials for hostile habitats, S.spurium ‘Coccineum’ was introduced from Harbin to Xigaze, Tibet and grew well. The physiological adaptability of S.spurium ‘Coccineum’ was studied in the present study. The results showed that with the extension of planting time, the content of malondialdehyde (MDA) in S.spurium ‘Coccineum’ leaves gradually increased, the increment was not significant. Proline content first decreased and then increased. The activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) all presented the tendency of “first increase then decrease”. It was suggested that S.spurium could adjust its physiological metabolism through increasing the contents of osmotic adjustment substances and enhancing the activities of protective enzymes, hence, adapted the high radiation, drought conditions of Xigaze.