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Title: Degradation of Bunker C Fuel Oil by White-Rot Fungi in Sawdust Cultures Suggests Potential Applications in Bioremediation

Abstract

Fungal lignocellulolytic enzymes are promising agents for oxidizing pollutants. This study investigated degradation of Number 6 “Bunker C” fuel oil compounds by the white-rot fungi Irpex lacteus, Trichaptum biforme, Phlebia radiata, Trametes versicolor, and Pleurotus ostreatus (Basidiomycota, Agaricomycetes). Averaging across all studied species, 98.1%, 48.6%, and 76.4% of the initial Bunker C C10 alkane, C14 alkane, and phenanthrene, respectively were degraded after 180 days of fungal growth on pine media. This study also investigated whether Bunker C oil induces changes in gene expression in the white-rot fungus Punctularia strigosozonata, for which a complete reference genome is available. After 20 days of growth, a monokaryon P. strigosozonata strain degraded 99% of the initial C10 alkane in both pine and aspen media but did not affect the amounts of the C14 alkane or phenanthrene. Differential gene expression analysis identified 119 genes with ≥ log2(2- fold) greater expression in one or more treatment comparisons. Six genes were significantly upregulated in media containing oil; these genes included three enzymes with potential roles in xenobiotic biotransformation. Carbohydrate metabolism genes showing differential expression significantly accumulated transcripts on aspen vs. pine substrates, perhaps reflecting white-rot adaptations to growth on hardwood substrates. The mechanisms by which P. strigosozonatamore » may degrade complex oil compounds remain obscure, but degradation results of the 180-day cultures suggest that diverse white-rot fungi have promise for bioremediation of petroleum fuels.« less

Authors:
 [1];  [2];  [1];  [3];  [3];  [3];  [1]
  1. Clark University, Worcester, MA (United States)
  2. Brown University, Providence, RI (United States)
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
Publication Date:
Research Org.:
USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Clark University; National Institute of Environmental Health Sciences
OSTI Identifier:
1904136
Grant/Contract Number:  
AC02-05CH11231; P42ES013660
Resource Type:
Accepted Manuscript
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 54 ENVIRONMENTAL SCIENCES; oils; alkanes; petroleum; fungi; crude oil; gene expression; fungal genetics; poplars

Citation Formats

Young, Darcy, Rice, James, Martin, Rachael, Lindquist, Erika, Lipzen, Anna, Grigoriev, Igor, and Hibbett, David. Degradation of Bunker C Fuel Oil by White-Rot Fungi in Sawdust Cultures Suggests Potential Applications in Bioremediation. United States: N. p., 2015. Web. doi:10.1371/journal.pone.0130381.
Young, Darcy, Rice, James, Martin, Rachael, Lindquist, Erika, Lipzen, Anna, Grigoriev, Igor, & Hibbett, David. Degradation of Bunker C Fuel Oil by White-Rot Fungi in Sawdust Cultures Suggests Potential Applications in Bioremediation. United States. https://doi.org/10.1371/journal.pone.0130381
Young, Darcy, Rice, James, Martin, Rachael, Lindquist, Erika, Lipzen, Anna, Grigoriev, Igor, and Hibbett, David. Thu . "Degradation of Bunker C Fuel Oil by White-Rot Fungi in Sawdust Cultures Suggests Potential Applications in Bioremediation". United States. https://doi.org/10.1371/journal.pone.0130381. https://www.osti.gov/servlets/purl/1904136.
@article{osti_1904136,
title = {Degradation of Bunker C Fuel Oil by White-Rot Fungi in Sawdust Cultures Suggests Potential Applications in Bioremediation},
author = {Young, Darcy and Rice, James and Martin, Rachael and Lindquist, Erika and Lipzen, Anna and Grigoriev, Igor and Hibbett, David},
abstractNote = {Fungal lignocellulolytic enzymes are promising agents for oxidizing pollutants. This study investigated degradation of Number 6 “Bunker C” fuel oil compounds by the white-rot fungi Irpex lacteus, Trichaptum biforme, Phlebia radiata, Trametes versicolor, and Pleurotus ostreatus (Basidiomycota, Agaricomycetes). Averaging across all studied species, 98.1%, 48.6%, and 76.4% of the initial Bunker C C10 alkane, C14 alkane, and phenanthrene, respectively were degraded after 180 days of fungal growth on pine media. This study also investigated whether Bunker C oil induces changes in gene expression in the white-rot fungus Punctularia strigosozonata, for which a complete reference genome is available. After 20 days of growth, a monokaryon P. strigosozonata strain degraded 99% of the initial C10 alkane in both pine and aspen media but did not affect the amounts of the C14 alkane or phenanthrene. Differential gene expression analysis identified 119 genes with ≥ log2(2- fold) greater expression in one or more treatment comparisons. Six genes were significantly upregulated in media containing oil; these genes included three enzymes with potential roles in xenobiotic biotransformation. Carbohydrate metabolism genes showing differential expression significantly accumulated transcripts on aspen vs. pine substrates, perhaps reflecting white-rot adaptations to growth on hardwood substrates. The mechanisms by which P. strigosozonata may degrade complex oil compounds remain obscure, but degradation results of the 180-day cultures suggest that diverse white-rot fungi have promise for bioremediation of petroleum fuels.},
doi = {10.1371/journal.pone.0130381},
journal = {PLoS ONE},
number = 6,
volume = 10,
place = {United States},
year = {Thu Jun 25 00:00:00 EDT 2015},
month = {Thu Jun 25 00:00:00 EDT 2015}
}

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