EDTA对狭叶香蒲吸收水中Cu^(2+)及Cu^(2+)在组织中迁移的影响

EFFECTS OF EDTA ON UPTAKE AND TRANSLOCATION OF COPPER IN CATTAIL(TYPHA ANGUSTIFOLIA L)

水培实验研究表明,100mg/L的Cu2+和0.5mmol/L的EDTA对狭叶香蒲(Typha angustifolia L.)的生长起到抑制作用。同时0.5mmol/L的EDTA能够促进狭叶香蒲吸收水中的Cu2+,并促进Cu2+从须根向地上部分转移,茎和叶中积累的Cu2+浓度为1233.8mg/kg和632.3mg/kg DW(干重),Cu2+从须根转移到茎部分的转移系数TFs从0.95上升到2.15;从须根转移到叶部分的转移系数从0.48上升到1.10。

Hydroponic study showed that Cu^2＋ at a concentration of 100mg/L and 0.5mmol/L EDTA had an inhibitory effect on growth of Typha angustifolia L.. However, the presence of EDTA at a concentration of 0.5mmol/L enhanced copper uptake and translocation of copper from hairy root to stem and leaf. The copper levels in stem and leaf were up to 1233.8 and 632.3 mg/kg DW, respectively. TFs （transfer factor of copper from hairy root to stem） increased from 0.95 to 2.15 and TFI （transfer factor of copper from hairy root to leaf） increased from 0.48 to 1.10 due to EDTA, indicating that EDTA is a useful amendment agent for phytoextraction of copper from water by typha.