Department of Biology, Croucher Institute for Environmental Sciences, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
J Hazard Mater. 2011 Mar 15;187(1-3):341-7. doi: 10.1016/j.jhazmat.2011.01.024. Epub 2011 Jan 14.
Polycyclic aromatic hydrocarbons (PAHs) commonly found in soils can be degraded in rhizosphere, but may also be taken up by plants. The effects of arbuscular mycorrhizal (AM) fungi on uptake of phenanthrene (PHE) and pyrene (PYR) in maize and on their dissipation in soil were investigated using the three-compartmentalized rhizoboxes. Inoculation of Glomus mosseae significantly (p<0.01) increased PHE and PYR concentrations in maize roots and significantly (p<0.05) enhanced PYR translocation from roots to stems in the soil treatments of the PHE+PYR spiked-soils added into the central compartment of the rhizoboxes. There was a significant (p<0.05) dissipation gradient of PHE and PYR observed away from the maize roots, with the highest dissipation rates recorded in rhizosphere zone in the central compartments of the rhizoboxes, followed by near rhizosphere zone and bulk soil zone in the outer compartments. However, G. mosseae only exerted minimal impacts on dissipation of PHE and PYR in the rhizosphere. The present study suggested that the hyphae and extraradical mycelium of AM fungi could play important roles in the uptake and translocation of PHE and PYR in plants. The present results indicated that there is a potential for the use of AM fungi and plant for remediating PAHs contaminated soils.
多环芳烃（PAHs）普遍存在于土壤中，可以在根际被降解，但也可能被植物吸收。本研究采用三分区根盒，研究了丛枝菌根（AM）真菌对玉米吸收菲（PHE）和芘（PYR）及其在土壤中消散的影响。接种摩西管柄囊霉（Glomus mosseae）显著（p<0.01）增加了玉米根系中 PHE 和 PYR 的浓度，并显著（p<0.05）增强了 PYR 从根系向茎的转运，在添加到根盒中央隔室的 PHE+PYR 污染土壤中。远离玉米根系的 PHE 和 PYR 具有显著（p<0.05）的消散梯度，在根盒中央隔室的根际区记录到最高的消散率，其次是近根际区和外隔室的土壤区。然而，摩西管柄囊霉对 PHE 和 PYR 在根际区的消散影响甚微。本研究表明，AM 真菌的菌丝和根外菌丝可能在植物吸收和转运 PHE 和 PYR 中发挥重要作用。本研究结果表明，利用 AM 真菌和植物修复 PAHs 污染土壤具有潜力。
