Effect of bivalent copper ion on the growth and antioxidant enzyme activity of Halophila ovalis
To determine the effect of seawater bivalent copper ion(Cu2+)at different concentrations on the growth of Halophila ovalis,seagrass H.ovalis was planted in door and in seawater containing dif-ferent amounts of Cu2+.After 2 weeks culture,the biomass,pigment content,soluble protein con-tent,three antioxidant enzyme activities of H.ovalis and copper content in its tissues were measured.The results showed that the increase of Cu2+content significantly affected the biomass and relative growth rate(RGR)(P＜0.05).The content of Cu2+had no significant effect on the pigment content(P＞0.05).The soluble protein content increased with the increase of Cu2+content.The activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT)decreased with the increase of Cu2+content.The amount of copper in above ground tissues was higher than that in underground parts.Moreover,with the increase of Cu2+content in seawater,more copper was enriched in plant tis-sues.We found also that the growth rate and the antioxidant enzyme activities of H.ovalis were de-creased significantly when the Cu2+was high than 0.1 mg/L in seawater.The high concentrations of Cu2+caused the degradation of seagrass bed.Copper was enriched in the leaves of H.ovalis,leading to the rapid defoliation of H.ovalis and affecting the ecological function of seagrass bed.
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