Question

From a farmer’s point of view who has agricultural crops, would it be better for a nitrate reducing bacteria in the soil to be a denitrifier (denitrification) or a disassimilatory nitrate reducer to ammonium (DNRA) and why?

Two dissimilatory nitrate reduction pathways: Denitrificatio Dissimilatory Nitrate Reduction to Ammonium (DNRA) NH,OH Hydroxyl amine NH, Ammonia Assimilatory nitrate reduction Although both processes are known to occur only one (denitrification has been thought to account for nearly all nitrate dissimilation in agricultural soils NONO NON, ON, NO, NOZ Nitrite Nitric oxide Dissimilatory nitrate reduction to ammonium Dissimilatory nitrate reduction to ammonium, also known as nitrate/nitrite ammonification, is the result of anaerobic respiration by chemoorganoheterotrophic microbes using nitrate as an electron acceptor for respiration. In anaerobic conditions microbes which undertake DNRA oxidise organic matter and use nitrate as an electron acceptor, reducing it to nitrite, then ammonium. NH. Two-step process in DARA (alitate ammonication (NA • Reduction of nitrate to literate respiration • Reduction of site to ammonium ferment Overall reaction Norp NO Nitrous oxide N, Nitrogen Dissimilatory nitrate reduction W Wikipedia Dissimilatory nitrate reduction to ammonium is a two step process, reducing NO 3- to NO 2- then NO 2- to NH 4+, though the reaction may begin with NO 2- directly. Each step is mediated by a different enzyme, the first step of dissimilatory nitrate reduction to ammonium is usually mediated by a periplasmic nitrate reductase. Oct 25 2019 Data from: Wikipedia Suggest an edit Dissimilatory nitrate reduction to ammonium - Wikipedia

Answer 1

It would be better for a nitrate reducing bacteria to be a denitrifier. Because nitrogen is a vital component for the plants to make the amino acids for the proteins and enzymes. As a farmer he will put various nitrates to replenish the soil. So instead of using chemical he can go for biological replenishment as in this case is better