草坪抗逆增绿剂对细叶结缕草抗寒性的影响

以细叶结缕草（Zoysia tenuifolia）为材料，研究自然降温过程中施用草坪抗逆增绿剂对草坪草生长和叶绿素含量、CAT、SOD、POD和PAL活性的影响。结果表明，自然降温过程中施用草坪抗逆增绿剂后，在恢复生长期草坪草叶绿素含量，CAT和POD 酶活性升高，而SOD、PAL酶活性无变化。 降温前、降温后施用草坪抗逆增绿剂可使叶片CAT、POD酶活性升高，与对照之间差异显著（P<0.05），尤其是降温前施用效果更佳。因此，在自然降温前施用草坪抗逆增绿剂可有效增强CAT、POD酶活性及其对生物体活性氧的清除能力、增加叶绿素含量、提高草坪草抗寒性和观赏性。

Influence of turfgass stress resistance and green enhancer on chilling resistance of Zoysia tenuifolia

In order to study the effect of turfgass stress resistance and green enhancer chilling resistance on turfgrass, chlorophyll content, activity of CAT, SOD, POD and PAL were measured in leaves of Zoysia tenuifolia with the application of turfgass stress resistance and green enhancer before or after natural low temperature. The results showed that chlorophyll content and the activity of CAT and POD increased after the application of turfgass stress resistance and green enhancer. However, there were no response of the activity of SOD and PAL. Compared with control, the activity of CAT and POD was significantly increased with the application of turfgass stress resistance and green enhancer before or after the natural low temperature. The effect of turfgass stress resistance and green enhancer was the best when applied before the natural low temperature. Therefore, turfgass stress resistance and green enhancer was recommended to apply before the natural low temperature in order to effectively improve the ability of reactive free radicals, reduce its damages to biological membrane and improve the chilling resistance and ornamental effects.