高盐胁迫对沟叶结缕草叶片抗氧化酶活性的影响

Effects of NaCl on Zoysia matrella

以优良草坪植物泌盐型沟叶结缕草(Zaysia matrella Merr.)为材料,研究了在0.5、1.0、1.5、2.0 mol/L梯度浓度NaCl高盐胁迫下,对沟叶结缕草叶片SOD、POD、CAT、APX和GR等抗氧化酶活性的影响。从抗氧化能力角度揭示沟叶结缕草的耐盐机理,为沿海地区用沟叶结缕草铺建草坪提供参考。结果表明:沟叶结缕草叶片抗氧化酶对盐胁迫的响应次序为:SOD>APX>POD>GR>CAT,说明SOD对高盐胁迫最敏感,各酶对0.5 mol/LNaCl的胁迫均有一定适应,而只有CAT酶对2.0 mol/L NaCl的胁迫有短期适应,其他酶活性均明显下降。

The effects of different concentration of NaCl （0.5,1.0,1.5,2.0 mol/L） on antioxidative enzymes in leaves of zoysiagrass （ Zoysia matrella ） with different salt tolerance grown hydroponically were investigated. From the standpoint of oxidation resistance, this investigation aims to explore the salt tolerance mechanism of zoysiagrass and provide reference for coastal use of zoysiagrass to build lawns. The results showed that the responses order is： SOD 〉 APX 〉 POD 2〉 GR 〉 CAT. SOD is most sensitive to salt-stress. Under salt-stress of 0.5 mol/LNaCl, all enzymes are notably adaptive. Under 2.0 mol/L NaCl, the activity of all enzymes significantly decreases while that of CAT is temporarily adaptive.