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Appl. Environ. Microbiol., Nov 1997, 4621-4624, Vol 63, No. 11
Copyright © 1997, American Society for Microbiology

Evidence that Elevated CO(inf2) Levels Can Indirectly Increase Rhizosphere Denitrifier Activity

DR Smart, K Ritchie, JM Stark and B Bugbee
Department of Vegetable Crops, University of California, Davis, California 95616; Department of Agronomy, University of Illinois, Champaign, Illinois 61821; and Department of Biology and Department of Plants, Soils and Biometeorology, Utah State University, Logan, Utah 84322

We examined the influence of elevated CO(inf2) concentration on denitrifier enzyme activity in wheat rhizoplanes by using controlled environments and solution culture techniques. Potential denitrification activity was from 3 to 24 times higher on roots that were grown under an elevated CO(inf2) concentration of 1,000 (mu)mol of CO(inf2) mol(sup-1) than on roots grown under ambient levels of CO(inf2). Nitrogen loss, as determined by a nitrogen mass balance, increased with elevated CO(inf2) levels in the shoot environment and with a high NO(inf3)(sup-) concentration in the rooting zone. These results indicated that aerial CO(inf2) concentration can play a role in rhizosphere denitrifier activity.

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