Effect of bivalent copper ion on the growth and antioxidant enzyme activity of Halophila ovalis
LI Qianru
ZENG Siqin
HU Jiefei
HUANG Jun
Zhang Yulei
ZENG Qitao
LUO Xiaoxia
HUANG Xianghu
Abstract：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.
Keywords：Halophila ovaliscoppergrowthantioxidant enzymeenrichment
Publication Date：2024-04-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 134-142 )