李伟,郭绍霞,邢丽君,翟彦霖,李文彬,李敏,刘润进
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A greenhouse pot experiment was conducted using tall fescue (Festuca elata ‘Crossfire II’) inoculated with or without the arbuscular mycorrhizal (AM) fungus Funneliformis mosseae. Plant biomass, defense enzyme activities, phosphorus (P) uptake and available cadmium (Cd) contents were determined in tall fescue plants grown in soil with Cd added at 0, 5, 15 and 30 mg/kg. As the Cd concentration increased, the mycorrhizal colonization and mycorrhizal relative dependency of the tall fescue increased. The presence of AM fungi improved P transportation from roots to the shoots, which helped the plant accumulate more P in the shoots. In addition, the activities of antioxidant enzymes were largely induced by the AM fungi and Cd stress in the tall fescue plants. In particular, the catalase activity in AM fungus inoculated plant increased significantly compared to the non-inoculated control. Malondialdehyde content decreased significantly in inoculated plants compared with control plants under Cd stress. Inoculang F. mosseae greatly enhanced the Cd enrichment capacity of the host plants and was conducive to fixing heavy metals withi roots, and reducing Cd content in the shoots compared to the non-inoculated control. This study shows that tall fescue inoculated with AM fungi has good potential as a Cd phytoremediator.