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Media type:
E-Article
Title:
Low Temperature and Neutral pH Define “ Candidatus Nitrotoga sp.” as a Competitive Nitrite Oxidizer in Coculture with Nitrospira defluvii
Contributor:
Wegen, Simone;
Nowka, Boris;
Spieck, Eva
Published:
American Society for Microbiology, 2019
Published in:
Applied and Environmental Microbiology, 85 (2019) 9
Language:
English
DOI:
10.1128/aem.02569-18
ISSN:
1098-5336;
0099-2240
Origination:
Footnote:
Description:
“ Ca. Nitrotoga” is a NOB of high environmental relevance, but physiological data exist for only a few representatives. Initially, it was detected in specialized niches of low temperature and low nitrite concentrations, but later on, its ubiquitous distribution revealed its critical role for N removal in engineered systems like WWTPs. In this study, we analyzed the competition between Nitrotoga and Nitrospira in bioreactors and identified conditions where the K strategist Ns. defluvii was almost replaced by Nitrotoga sp. BS. We show that the pH value is an important factor that regulates the composition of the nitrite-oxidizing enrichment with a dominance of Nitrotoga sp. BS versus Ns. defluvii at a neutral pH of 7.4 in combination with a temperature of 17°C. The physiological diversity of novel Nitrotoga cultures improves our knowledge about niche differentiation of NOB with regard to functional nitrification under suboptimal conditions.