Title: Effect of arbuscular mycorrhizal fungi on cadmium uptake and translocation in festuca rubra plant
Abstract:Effect of arbuscular mycorrhizal fungi on cadmium uptake and translocation in Festuca rubra Linn. plant was investigated with a pot culturing method in greenhouse. Cadmium was added to a sandy loam so...Effect of arbuscular mycorrhizal fungi on cadmium uptake and translocation in Festuca rubra Linn. plant was investigated with a pot culturing method in greenhouse. Cadmium was added to a sandy loam soil as CdSO_4·8H_2O at 0,15, and 50?mg·kg~(-1). The soils had been precultured for three weeks before sowing the plant seeds. Two AM fungi, Glomus mosseae (BEG168) and Glomus intraradices (BEG141) were inoculated into plants, while a non-inoculating control was set up. The plants were harvested three times at 70?d, 105?d and 210?d respectively after sowing. At the first and second harvests, only shoots were cut, and at the third time , both shoots and roots were harvested. Three replications were set for each treatment. Mycorrhizal colonization, dry weight of plant, P concentration and Cd concentration were measured. The results showed that the addition of 15 and 50?mg·kg~(-1) Cd in soil did not reduce mycorrhizal colonization. P concentration in shoot of Festuca rubra plant was not significantly affected by inoculating with the both AM fungal species, while the dry weights of Festuca rubra plant with mycorrhizal fungi were lower than that of non-mycorrhizal plant. Under Cd contaminated soil condition, arbuscular mycorrhizal fungi strengthened the bio-fixity of Cd in root and reduced Cd translocation from root to shoot, which induced decreasing of Cd concentration in shoot in all three harvests and root at the final harvest furthermore. The total accumulation of Cd in both shoot and root in mycorrhizal plants was also lower than that of non-mycorrhizal plants. For example, at 50?mg·kg~(-1) Cd level, Cd concentration and Cd uptake in mycorrhizal plants were decreased 50% and 60% respectively comparing with non-mycorrhizal plant. The two fungal species showed different effectiveness in reducing Cd concentration in plant shoot. The relative reducing rate of G. mosseae was 25%, while G. intraradices was 52%~55% at the same two Cd addition levels. The results implied that mycorrhizal fungi colonization might be the direct cause for the reduction of Cd uptake in Festuca rubra. It was concluded that arbuscular mycorrhizal fungi, one of the entrances for contaminants from soil environment to food chain, played a crucial important role in regulating Cd bio- recycling in ecosystem and in alleviating the stress of Cd contamination on food chain.Read More
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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