铅锌矿区分离丛枝菌根真菌对万寿菊生长与吸镉的影响

盆栽试验研究了土壤不同施Cd水平(0、20、50 mg kg-1)下,接种矿区污染土壤中丛枝菌根真菌对万寿菊根系侵染率、植株生物量及Cd吸收与分配的影响。结果表明:接种丛枝菌根真菌显著提高了Cd胁迫下万寿菊的根系侵染率和植株生物量;随着施Cd水平提高,各处理植株Cd浓度和Cd吸收量显著增加。各施Cd水平下万寿菊地上部Cd吸收量远远高于根系Cd吸收量,尤其在20 mg kg-1施Cd水平下,接种处理地上部Cd吸收量是根系的3.90倍,对照处理地上部Cd吸收量是根系的2.33倍;同一施Cd水平下接种处理地上部Cd吸收量要显著高于对照。总体上,试验条件下污染土壤中分离的丛枝菌根真菌促进了万寿菊对土壤中Cd的吸收,并增加了Cd向地上部分的运转,表现出植物提取的应用潜力。

Effect of arbuscular mycorrhizal fungi isolated from mining area on growth and Cd uptake of Tagetes erecta L.

In a pot experiment, effects were investigated of inoculation with arbuscular mycorrhizal fungi isolated from soil of a mining area on root colonization and plant biomass, Cd uptake and distribution of marigold (Tagetes erecta L.) growing in soils applied with Cd at different rates (0, 20, 50 mg kg^-1). Results indicate that inoculation of the fungi significantly increased their root colonization and biomass of marigold plants. Plant Cd concentrations and uptake markedly increased with increasing Cd addition levels. For all the treatments, Cd contents were significantly higher in shoots than in roots, while with the same rate of Cd added Cd content was higher in the shoots of inoculated plants than of uninoculated control. Especially, in Treatment 20 mg kg^-1, the ratio of Cd content in shoot to that in root of inoculated plants was 3.90, while in control it was only 2.33. In general, inoculation with arbuscular mycorrhizal fungi isolated from contaminated soil AMF increases Cd uptake in plants and enhances Cd translocation from roots to shoots, showing a promise in Cd phytoextraction.