Nitrate reducers containing
narG
or
napA
are ubiquitous, but little is known about their functional performance in various environments. Our study provides an important clue that the nitrate consumption of
narG
-containing strains is mainly caused by dissimilatory reduction in the environments, while that of
napA
-containing nitrate reducers under anaerobic conditions is ascribed to nitrate dissimilation but under the aerobic condition is attributed to the assimilation by cell growth.
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