Effect of Polyaromatic Hydrocarbons in Soil on Arbuscular Mycorrhizal Plants
- C. Leyval * and
- P. Binet
The rhizosphere of plants plays a role in the bioremediation of soils polluted with organic pollutants such as polyaromatic hydrocarbons (PAHs). Arbuscular mycorrhizal (AM) fungi provide a direct link between soil and plant roots, but very little is known of the interactions between PAHs and AM fungi. We studied the effect of PAHs on mycorrhizal colonization in polluted soil, and the effect of AM fungi on plant growth in these soils. Leek (Allium porrum L.), maize (Zea mays L.), ryegrass (Lolium perenne L.), and clover (Trifolium subterraneum L.) were grown in pots containing a soil artificially contaminated with increasing concentrations of anthracene or mixed with an industrial soil polluted with PAHs. Mycorrhizal colonization by the indigenous AM population of the nonpolluted soil was not significantly affected by the addition of anthracene up to 10 g kg−1. However, mycorrhizal colonization of clover and leek decreased when the industrial soil was added to the nonpolluted soil, while maize and ryegrass colonization was not affected. The effect of PAHs on plant survival and growth depended on plant species. Inoculation of ryegrass with Glomus mosseae improved plant survival and plant growth in the industrially polluted soil. At 5 g of PAH kg−1 only mycorrhizal plants survived. Mycorrhizal fungi may contribute to the establishment and maintenance of plants in PAH-polluted soils.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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