Effects of AM Fungi on Physiology and Cadmium Enrichment Characteristics of Festuca elata Under Cadmium Stress
In order to reveal the roles of arbuscular mycorrhiza(AM)fungi on cadmium(Cd)stress toler-ance in Festuca elata,an inoculation experiment was carried out under greenhouse pot conditions using Funnieliformis mosseae(Fm)to investigate the effects of AM fungi inoculation on the growth,nutrient accumulation,antioxidant enzyme activity,osmoregulation substance content,and Cd enrichment and transport of F.elata under Cd stress.The results showed that within the range of 0-200 mg·kg-1 Cd concentrations,regardless of inoculation with or without AM fungi,there was a significant"low promo-tion and high inhibition"effect of Cd on plant height,shoot dry weight,shoot carbon(C),nitrogen(N),phosphorus(P)and potassium(K)accumulation of F.elata,and the best promotion effect was achieved at 20 mg·kg-1,and that the AM inoculation improved C accumulation,N,P,K absorption and growth of F.elata.Compared with no inoculation,inoculation with AM fungi increased the activity of superoxide dismutase,peroxidase and catalase and decreased malondialdehyde content in F.elata,and the soluble protein,soluble sugar and proline content of F.elata treated with AM fungi increased,especially at 40 mg·kg-1 Cd concentration.Regardless of inoculation with or without AM fungi,the Cd content and en-richment in the roots of F.elata were significantly higher than those in the shoots,and inoculation with AM fungi increased the Cd content and enrichment in shoots and roots.At 0,20,40 mg·kg-1 Cd concen-trations,Cd bioaccumulation factors of plants were significantly increased by 29.2％,49.1％and 67.9％,respectively,and within the range of 0-40 mg·kg-1 Cd concentrations,AM fungi had the best effects on Cd enrichment.This study demonstrates that the F.elata-AM fungal symbiosis has a strong enrichment effect on the heavy metal Cd and has potential application in the remediation of Cd-contaminated soil.
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