Regulation of root-associated methanotrophy by oxygen availability in the rhizosphere of two aquatic macrophytes.

Applied and Environmental Microbiology
A Calhoun, G M King

Abstract

The relative importance of oxygen for root-associated methanotrophy was examined by using sediment-free, intact freshwater marsh plants (Pontederia cordata and Sparganium eurycarpum) incubated in split chambers. The root medium contained approximately 100 (mu)M methane. Methane oxidation was calculated from the difference between methane loss from chambers in the presence and absence of 1 mM 1-allyl-2-thiourea, a methanotrophic inhibitor. When the root medium was oxic, methane oxidation accounted for 88 and 63% of the total methane depletion for S. eurycarpum and P. cordata, respectively; the remainder represented diffusional loss to the atmosphere via roots, stems, and leaves. Under suboxic conditions, methane oxidation was not detectable for S. eurycarpum but accounted for 68% of total methane depletion for P. cordata. The introduction of a biological oxygen sink, Pseudomonas aeruginosa, resulted in complete loss of methane oxidation in S. eurycarpum chambers under oxic conditions, while methane consumption continued (51.6% of total methane depletion) in P. cordata chambers. The differences between plant species were consistent with their relative ability to oxygenate their rhizospheres: during a suboxic incubation, dissolved...Continue Reading

References

Sep 1, 1994·Applied and Environmental Microbiology·G M King
Sep 1, 1990·Applied and Environmental Microbiology·G M KingH Skovgaard
Oct 1, 1994·Applied and Environmental Microbiology·S Schnell, G M King
Nov 1, 1994·Applied and Environmental Microbiology·J A Amaral, R Knowles

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Citations

Feb 23, 2020·Environmental Science and Pollution Research International·Bo WangYuan Liu
Aug 18, 2005·Environmental Microbiology·Claudia Knief, Peter F Dunfield
Jul 27, 2001·Applied and Environmental Microbiology·P van BodegomP Leffelaar
May 10, 2002·Environmental Microbiology·Jennifer L MacaladyKate M Scow
Dec 5, 2012·Environmental Science and Pollution Research International·Simona Di GregorioRoberto Lorenzi
Jul 2, 2003·The Journal of General and Applied Microbiology·Motoo UtsumiHiroo Uchiyama
Mar 6, 2009·International Journal of Phytoremediation·Ilisa TawneyAndrew H Baldwin
Dec 3, 1998·Applied and Environmental Microbiology·J J Rich, G M King
Jul 1, 2017·Environmental Science and Pollution Research International·Sophie GentèsRémy Guyoneaud
Sep 21, 2019·Journal of Environmental Management·Kundan SamalShivanshi Trivedi
Oct 3, 1999·Applied and Environmental Microbiology·G M King, M A Garey

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