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Bacteria on leaves: a previously unrecognised source of N2O in grazed pastures.

ABSTRACT: Nitrous oxide (N2O) emissions from grazed pastures are a product of microbial transformations of nitrogen and the prevailing view is that these only occur in the soil. Here we show this is not the case. We have found ammonia-oxidising bacteria (AOB) are present on plant leaves where they produce N2O just as in soil. AOB (Nitrosospira sp. predominantly) on the pasture grass Lolium perenne converted 0.02-0.42% (mean 0.12%) of the oxidised ammonia to N2O. As we have found AOB to be ubiquitous on grasses sampled from urine patches, we propose a 'plant' source of N2O may be a feature of grazed grassland.

SUBMITTER: Bowatte S 

PROVIDER: S-EPMC4274428 | biostudies-other | 2015 Jan

REPOSITORIES: biostudies-other

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Bacteria on leaves: a previously unrecognised source of N2O in grazed pastures.

Bowatte Saman S   Newton Paul C D PC   Brock Shona S   Theobald Phil P   Luo Dongwen D  

The ISME journal 20140711 1

Nitrous oxide (N2O) emissions from grazed pastures are a product of microbial transformations of nitrogen and the prevailing view is that these only occur in the soil. Here we show this is not the case. We have found ammonia-oxidising bacteria (AOB) are present on plant leaves where they produce N2O just as in soil. AOB (Nitrosospira sp. predominantly) on the pasture grass Lolium perenne converted 0.02-0.42% (mean 0.12%) of the oxidised ammonia to N2O. As we have found AOB to be ubiquitous on gr  ...[more]