铁和ATP酶抑制剂对鸭跖草(Commelina communis)铜吸收的影响

EFFECTS OF Fe AND ATPase INHIBITOR ON Cu UPTAKE BY COMMELINA COMMUNIS

缺铁条件下研究了鸭跖草 (Commelinacommunis)对不同浓度铜及不同形态铜的吸收和P 型ATP酶抑制剂对铜吸收的影响。结果表明 ,鸭跖草铜累积量随着营养液中铁浓度的下降而显著上升 ,缺铁在不同铜浓度下都显著促进鸭跖草对铜的吸收 ,说明鸭跖草铜吸收与铁元素关系密切。在缺铁条件下 ,EDTA Cu、NTA Cu、草酸 Cu、柠檬酸 Cu处理鸭跖草的铜吸收量均低于单Cu处理 ,但缺铁处理植株对不同形态铜的吸收量均高于完全培养液生长的植株。缺铁处理下鸭跖草会产生根际酸化效应。P 型ATP酶抑制剂钒酸钠对铜吸收有抑制作用 ,缺铁对铜吸收的促进作用可能与P

Effects of Fe deficiency and P type ATPase inhibitor on Cu uptake by C. communis were investigated in this study. The results showed that Cu accumulation in C. communis was increased with the drop in Fe concentration in the nutrient solution. Cu uptake by C. communis was significantly enhanced by Fe deficiency in solutions with different Cu concentrations, which suggested that there was an inherent relationship between Cu uptake and element Fe. Cu concentrations in Fe deficient plants in Treatments EDTA Cu, NTA Cu, oxalate Cu, and citrate Cu, were lower than that in Treatment Cu. But Cu uptake, no matter what form of Cu, by Fe deficient plants was higher than that by Fe sufficient plants. Fe deficiency could lead to acidification of the rhizosphere of C. communis . Cu uptake was inhibited by P type ATPase inhibitor Na 3VO 4. The promotion of Cu uptake by Fe deficiency perhaps had nothing to do with the activity of P type ATPase