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A regulatory role for phenol oxidase during decomposition in peatlands

Freeman, C.; Ostle, N.J.; Fenner, N.; Kang, H.. 2004 A regulatory role for phenol oxidase during decomposition in peatlands. Soil Biology and Biochemistry, 36 (10). 1663-1667. 10.1016/j.soilbio.2004.07.012

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Abstract/Summary

Unique peatland properties, such as their ability to preserve intact ancient human remains (bog bodies) and to store globally significant quantities of atmospheric CO2, can be attributed to their low rates of enzymic decomposition. Peatland soils are normally devoid of molecular oxygen in all, but the uppermost layer, and thus enzymes such as phenol oxidase, which require molecular oxygen for their activity, are rarely active. Interestingly, even the activities of enzymes such as hydrolases that have no oxygen requirement, are also extremely limited in peatlands. Here, we show that those low hydrolase activities can be indirectly attributed to oxygen constraints on phenol oxidase. On addition of oxygen, phenol oxidase activity increased 7-fold, P<0.05, a response that allowed phenolic depletion in the peatland soil. Phenolic materials are highly inhibitory to enzymes and their lower abundance allowed higher hydrolase activities (β-glucosidase 26%, P<0.05, phosphatase 18%, P<0.05, sulphatase 47%, P<0.01, xylosidase 16%, P<0.05 and chitinase 22%, P<0.05). Thus, oxygen constraints upon phenol oxidase activity promote conditions that inhibit decomposition. This mechanism has important implications for preservation of archaeological organic materials, sequestration of atmospheric CO2 and potentially in the preservation of food and treatment of water pollution.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.soilbio.2004.07.012
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.2 Carbon
CEH Sections: _ Biogeochemistry & Ecosystem Function
_ Ecological Processes in Freshwater & Soils
ISSN: 0038-0717
Additional Keywords: Carbon cycling, Phenol oxidase, Nutrient cycling, Wetlands, Decomposition, Preservation
NORA Subject Terms: Agriculture and Soil Science
Biology and Microbiology
Ecology and Environment
Earth Sciences
Date made live: 17 Aug 2009 13:14
URI: http://nora.nerc.ac.uk/id/eprint/5091

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