Department of Earth and Environmental Studies, Montclair State University, NJ, USA.
J Hazard Mater. 2010 May 15;177(1-3):465-74. doi: 10.1016/j.jhazmat.2009.12.056. Epub 2009 Dec 21.
Lead (Pb) has limited solubility in the soil environment owing to complexation with various soil components. Although total soil Pb concentrations may be high at a given site, the fraction of soluble Pb that plants can extract is very small, which is the major limiting factor for Pb phytoremediation. The symbiotic effect of arbuscular mycorrhizal (AM) fungus, Glomus mosseae was examined on growth and phytoextraction of lead (Pb) by vetiver grass [Chrysopogon zizanioides (L.)]. A hydroponic study, Phase I (0, 1, 2, and 4mM Pb) was conducted followed by an incubation pot study, Phase II (0, 400, 800, and 1200 mg kg(-1) Pb) where vetiver plants were colonized with G. mosseae. The results obtained indicate that plants colonized by the AM fungi not only exhibit better growth (increase in plant biomass), but also significantly increase Pb uptake in root and higher translocation to the shoot at all given treatments. Moreover, plants colonized with AM fungi had higher chlorophyll content and reduced levels of low molecular weight thiols, indicating the ability to better tolerate metal-induced stress. Results from this study indicate that vetiver plants in association with AM fungi can be used for improved phytoextraction of Pb from contaminated soil.
由于与各种土壤成分络合，铅（Pb）在土壤环境中的溶解度有限。尽管在给定地点的土壤中总铅浓度可能很高，但植物可提取的可溶性铅的比例非常小，这是 Pb 植物修复的主要限制因素。根围共生菌丛枝菌根（AM）真菌摩西球囊霉（Glomus mosseae）对香根草（Chrysopogon zizanioides（L.））生长和铅（Pb）植物提取的共生效应进行了研究。进行了水培研究，第一阶段（0、1、2 和 4mM Pb），随后进行了培养盆研究，第二阶段（0、400、800 和 1200mg kg(-1)Pb），其中香根草植物被 G. mosseae 定殖。结果表明，被 AM 真菌定殖的植物不仅表现出更好的生长（植物生物量增加），而且在所有处理中都能显著增加根中的 Pb 吸收，并将更多的 Pb 转运到地上部分。此外，被 AM 真菌定殖的植物具有更高的叶绿素含量和更低水平的低分子量硫醇，表明它们具有更好的耐受金属诱导胁迫的能力。这项研究的结果表明，与 AM 真菌共生的香根草植物可以用于从污染土壤中提高 Pb 的植物提取。
