EDTA对铅胁迫下香根草生长及铅积累特性的影响

Effects of EDTA on the Growth and Lead Accumulation of Vetiver Under Lead Stress

以香根草为试材,采用水培方法,研究了EDTA对铅胁迫下香根草生长及铅积累特性的影响。结果表明:单一Pb处理可明显抑制植株的生长,香根草体内的Pb含量随Pb处理浓度的增加而显著增加,根系Pb含量明显高于地上部。与单一处理相比,添加EDTA处理后,在一定程度上抑制了Pb污染下香根草的生长。EDTA处理14d植株内Pb的积累总量比单一Pb处理显著增加,地上部与植株总吸收量Pb的比值均明显上升,表明EDTA可促进香根草对Pb的吸收和积累,同时促进Pb向香根草地上部运输。

The effects of EDTA on the growth and lead accumulation characteristics of vetiver under lead stress were studied in solution culture experiment. The results showed plant growth of Vetiveria zizanioides was obviously inhibited by the simple lead treatment,the concentration of Pb in vetiver plant increased with Pb concentration in solution, and Pb contents in roots was higher than that in shoots. Compared with the simple Pb treatment, the growth of Vetiveria zizanioides was in a certain extent inhibited by EDTA adding to the Pb contaminated solution. Pb accumulations in the shoots and roots of Vetiveria zizanioides were significantly increased by EDTA treatment, the ratio of Pb contents in shoots and roots increased by EDTA treatment. It indicated that EDTA treatment improved Pb absorption and accumulation of Vetiveria zizanioides, and also promoted the Pb transportation to the shoots.