Effect of birch (Betula spp.) and associated rhizoidal bacteria on the degradation of soil polyaromatic hydrocarbons, PAH-induced changes in birch proteome and bacterial community |
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Authors: | Tervahauta Arja I Fortelius Carola Tuomainen Marjo Akerman Marja-Leena Rantalainen Kimmo Sipilä Timo Lehesranta Satu J Koistinen Kaisa M Kärenlampi Sirpa Yrjälä Kim |
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Institution: | a Department of Biosciences, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland b EVTEK University of Applied Sciences, Vantaa, Finland c Department of Biological and Environmental Sciences, University of Helsinki, Finland |
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Abstract: | Two birch clones originating from metal-contaminated sites were exposed for 3 months to soils (sand-peat ratio 1:1 or 4:1) spiked with a mixture of polyaromatic hydrocarbons (PAHs; anthracene, fluoranthene, phenanthrene, pyrene). PAH degradation differed between the two birch clones and also by the soil type. The statistically most significant elimination (p ≤ 0.01), i.e. 88% of total PAHs, was observed in the more sandy soil planted with birch, the clearest positive effect being found with Betula pubescens clone on phenanthrene. PAHs and soil composition had rather small effects on birch protein complement. Three proteins with clonal differences were identified: ferritin-like protein, auxin-induced protein and peroxidase. Differences in planted and non-planted soils were detected in bacterial communities by 16S rRNA T-RFLP, and the overall bacterial community structures were diverse. Even though both represent complex systems, trees and rhizoidal microbes in combination can provide interesting possibilities for bioremediation of PAH-polluted soils. |
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Keywords: | Birch PAH Bacterial communities Proteomics T-RFLP |
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