Chen Xiu-Hua, Zhao Bin
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
Chemosphere. 2007 Jul;68(8):1548-55. doi: 10.1016/j.chemosphere.2007.02.068. Epub 2007 May 1.
A glasshouse experiment was carried out to study the effect of mycorrhizal formation by Gigaspora margarita, Glomus intraradices or Acaulospora laevis on plant growth and lanthanum (La) uptake of Astragalus sinicus L. in soils spiked with La at five levels (0, 1, 5, 10 and 20 mg kg(-1)). La application decreased mycorrhizal infection frequency and activity of fungal succinate dehydrogenase and alkaline phosphatase. Increasing La concentrations in soil led to increased La accumulation in tissues of both mycorrhizal and non-mycorrhizal plants, but inoculation with Gig. margarita or G. intraradices reduced La concentrations in shoots and roots at higher concentrations of La in the soil. Plant biomass and P concentrations in shoots and roots were reduced by La application, but increased by inoculation with Gig. margarita or G. intraradices. The results showed that appropriate AM fungi colonization could be effective in alleviating La toxicity in A. sinicus.
进行了一项温室试验，以研究在添加了五个水平（0、1、5、10和20 mg kg(-1)）镧（La）的土壤中，珠状巨孢囊霉、根内球囊霉或光壁无梗囊霉形成菌根对紫云英生长和镧吸收的影响。施用镧降低了菌根感染频率以及真菌琥珀酸脱氢酶和碱性磷酸酶的活性。土壤中镧浓度的增加导致菌根植物和非菌根植物组织中镧的积累增加，但在土壤中较高浓度的镧条件下，接种珠状巨孢囊霉或根内球囊霉降低了地上部和根部的镧浓度。施用镧降低了地上部和根部的植物生物量和磷浓度，但接种珠状巨孢囊霉或根内球囊霉则使其增加。结果表明，适当的丛枝菌根真菌定殖可有效减轻紫云英中的镧毒性。
