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Enhanced Phenanthrene Biodegradation in Soil by Slender Oat Root Exudates and Root Debris

Ryan K. Miya and Mary K. Firestone*

Department of Environmental Science, Policy, and Management, Ecosystem Sciences Div., 151 Hilgard Hall no. 3110, Univ. of California, Berkeley, CA 94720-3110



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Fig. 1. Numbers of heterotrophic bacteria over time in control (circle), root debris–amended (square), exudate-amended (triangle), and combined debris + exudate–amended soils (X). LSD = 1.18 x 106.

 


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Fig. 2. Phenanthrene degrading bacteria (LSD = 4.21 x 105) and corresponding soil phenanthrene concentrations over time.

 


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Fig. 3. Ratios of populations in amended and control soils over time for heterotrophic and phenanthrene-degrader communities in (A) debris-amended, (B) exudate-amended, and (C) debris + exudate–amended soils. *P < 0.05.

 





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