Effects of Glomus intraradices on Growth and Cd Enrichment of Ryegrass(Lolium perenne L.)

To investigate the possible role of arbuscular mycorrhizal(AM) on the bioremediation of Cd contaminated soils,pot experiments were conducted to adopt simulating contaminations on sandyloam soil.Effect of arbuscular mycorrhizal(Glomus intraradices) on plant growth and Cd enrichment and translocation were determined at three Cd application levels(0,15,45 mg/kg).Cd in soil significantly increased the infection rate of ryegrass by G.intraradices while decreased dry weight of ryegrass.P concentration of ryegrass plant was not significantly affected by inoculation of AM fungi.These results implied that G.intraradices had some endurance to Cd contamination in soil,while no promotion on P uptake and the growth of ryegrass.Cd enrichment in ryegrass was stimulated by inoculation with G.intraradices.AM fungi strengthened the bio-fixing of Cd in root and reduced Cd translocation from root to shoot,thus decreased Cd concentration in shoot,which were explained by the fact that the enrichment coefficient of Cd in root was above 1 while the translocation coefficient was below 1.AM fungus could adjust the distribution proportion of Cd in host plant and protect host plants against heavy metal contamination.These functional characters of AM fungi could play a great role in remediation of Cd contaminated farmland and improving the quality of turf and forage grasses.