Microbial population dynamics associated with crude-oil biodegradation in diverse soils

Natsuko Hamamura, Sarah H. Olson, David M. Ward, William P. Inskeep

研究成果: Contribution to journalArticle査読

151 被引用数 (Scopus)

抄録

Soil bacterial population dynamics were examined in several crude-oil-contaminated soils to identify those organisms associated with alkane degradation and to assess patterns in microbial response across disparate soils. Seven soil types obtained from six geographically distinct areas of the United States (Arizona, Oregon, Indiana, Virginia, Oklahoma, and Montana) were used in controlled contamination experiments containing 2% (wt/wt) crude oil spiked with [1-14C]hexadecane. Microbial populations present during hydrocarbon degradation were analyzed using both 16S rRNA gene sequence analysis and by traditional methods for cultivating hydrocarbon-oxidizing bacteria. After a 50-day incubation, all seven soils showed comparable hydrocarbon depletion, where >80% of added crude oil was depleted and approximately 40 to 70% of added [14C] hexadecane was converted to 14CO2. However, the initial rates of hydrocarbon depletion differed up to 10-fold, and preferential utilization of shorter-chain-length n-alkanes relative to longer-chain-length n-alkanes was observed in some soils. Distinct microbial populations developed, concomitant with crude-oil depletion. Phylogenetically diverse bacterial populations were selected across different soils, many of which were identical to hydrocarbon-degrading isolates obtained from the same systems (e.g., Nocardioides albus, Collimonas sp., and Rhodococcus coprophilus). In several cases, soil type was shown to be an important determinant, defining specific microorganisms responding to hydrocarbon contamination. However, similar Rhodococcus erythropolis-like populations were observed in four of the seven soils and were the most common hydrocarbon-degrading organisms identified via cultivation.

本文言語英語
ページ(範囲)6316-6324
ページ数9
ジャーナルApplied and environmental microbiology
72
9
DOI
出版ステータス出版済み - 9 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 食品科学
  • 生態学
  • 応用微生物学とバイオテクノロジー

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