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The rates and players of denitrification, dissimilatory nitrate reduction to ammonia (DNRA) and anaerobic ammonia oxidation (anammox) in mangrove soils

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Kraft,  Beate
Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Tegetmeyer,  Halina E.
HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Strous,  Marc
Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Luvizott, D. M., Araujo, J. E., Silva, M. D. C. P., Dias, A. C. F., Kraft, B., Tegetmeyer, H. E., et al. (2019). The rates and players of denitrification, dissimilatory nitrate reduction to ammonia (DNRA) and anaerobic ammonia oxidation (anammox) in mangrove soils. Anais da Academia Brasileira de Ciencias, 91: UNSP e20180373. doi:10.1590/0001-3765201820180373.


Cite as: https://hdl.handle.net/21.11116/0000-0005-C224-7
Abstract
Mangroves are ecosystems located in the transition zone between land and
sea, characterized by periodic flooding that confer to its unique
characteristics. Little is known about the transformation of nutrients
that occur during the organic matter degradation in this system. In this
study, we monitor the nitrogen transformations in soils from three
mangroves with distinct levels of contamination using labeled 15NO3-. We
also screened the mangroves metagenomes for the presence of genes that
encode enzymes involved in denitrification (nirS, nirK, nosZ, norB and
narG), anaerobic oxidation of ammonia (anammox) (hh, hao and hzo) and
dissimilatory nitrate reduction to ammonium (DNRA) (nrfA). The
transformations of 15NO3-indicated the balance of denitrification over
anammox and DNRA in all three mangroves, with lower rates of processes
in the mangrove affected by oil contamination. The metagenomic analysis
detected 56 sequences related to denitrification, 19 with anammox and 6
with DNRA. Genes related with denitrification were phylogenetically
distributed among several groups of bacteria (mainly
Gammaproteobacteria). Anammox and DNRA related sequences were affiliated
with Planctomycetes and Gammaproteobacteria, respectively. Thus,
metagenomic and functional approaches supported the description of
denitrification, anammox and DNRA rates in mangrove soils, and
identified the major bacterial groups involved in these processes.