alexa Cold-temperate climate: a factor for selection of ammonia oxidizers in upland soil?
Microbiology

Microbiology

Applied Microbiology: Open Access

Author(s): Avrahami S, Conrad R

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Abstract Ammonia-oxidizing bacteria in various upland soils show a rather large diversity with respect to their amoA genes (coding for a subunit of the ammonium monooxygenase). It is known that the community structure of ammonia-oxidizing bacteria in upland soils is influenced by different selective factors, such as pH, gravimetric water content, fertilizer treatment, and temperature. The question, from an ecological point of view, is whether a particular ecophysiological factor, such as temperature, could select for a particular community structure of ammonia oxidizers in upland soils that would be represented by distinct clusters of the amoA gene (AmoA cluster). Studying the literature, including recent publications and our own unpublished results, we found that AmoA clusters 3a, 3b, and 9-12 apparently exhibited no preference for either subtropical/tropical soils (i.e., warm regions) or temperate cold soils. However, AmoA clusters 1 and 4 (and perhaps cluster 2) seem to occur predominantly in soils from cold-temperate regions. Here we review the evidence for a temperature effect on the global distribution of amoA genes in warm- and cold-temperate soils. This article was published in Can J Microbiol and referenced in Applied Microbiology: Open Access

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