Plant Growth and Metal Distribution in Tissues of Prosopis juliflora-velutina Grown on Chromium Contaminated Soil in the Presence of Glomus deserticola

摘要

Arbuscular mycorrhizal fungi have been known to increase metal uptake in plants. In this study, mesquite (Prosopisjuliflora-velutina) inoculated with Glomus deserticola or amended with EDTA were grown for 30 days in soil containing Cr(III) or Cr(VI) at 0,40,80, and 160 mg kg~(-1). Total amylase activity (TAA) was monitored as a stress indicator. Element concentrations and distribution in tissue were determined using ICP-OES, electron scanning microprobe, and TEM. Inoculated Cr(VI) treated plants had 21% and 30% more Cr than uninoculated and EDTA treated roots, respectively, at 80 mg Cr kg~(-1) treatment. In the case of Cr(III), EDTA produced the highest Cr accumulation in roots. TAA was higher in inoculated plants grown with Cf(III) at 80 and 160 mg kg ' and Cr(VI) at 40 and 160 mg kg~(-1). The X-ray mapping showed higher metal concentrations in the vascular system of inoculated plants and the TEM micrographs demonstrated the presence of G. deserticola in roots.