Photoinhibition of marine nitrifying bacteria. II. Dark recovery after monochromatic or polychromatic irradiation

Ma, Guerrero; Rd, Jones

doi:10.3354/meps141193

Cited by 59 publications

(49 citation statements)

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“…Additionally, the wavelength of light used also showed a variable inhibitory effect, with UV wavelengths (<400 nm) the most damaging to AO by AOB cultures (Hooper and Terry, 1974;Guerrero and Jones, 1996a). Recovery after photoinhibition was also found to be wavelength-dependent, as AOB exposed to longer wavelengths (>400 nm) regained activity faster than those exposed to shorter wavelengths or sunlight (Guerrero and Jones, 1996b). Strong absorption of UV radiation (280-400 nm) leads to the production of H 2 O 2 (Miller, 2000;Yocis et al, 2000), with only 10-20% of H 2 O 2 produced by wavelengths >400 nm (Miller, 2000).…”

Section: Discussionmentioning

confidence: 99%

Ammonia Oxidation in the Ocean Can Be Inhibited by Nanomolar Concentrations of Hydrogen Peroxide

et al. 2016

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Marine Thaumarchaeota were discovered over 20 years ago and although a few isolates from this group are now available for study, we do not yet understand the environmental controls on their growth and distribution. Thaumarchaeotes oxidize ammonia to nitrite, mediating a key step in the global nitrogen cycle, and it is estimated that about 20% of all prokaryotic cells in the ocean belong to this phylum. Despite their almost ubiquitous distribution, marine Thaumarchaeota are rarely abundant in open-ocean surface (<100 m) waters. We tested the hypothesis that this vertical distribution is driven by reactive oxygen species (ROS), specifically H 2 O 2 , generated by photochemical and biological processes-"indirect photoinhibition" rather than light inhibition as previously postulated for ammonia-oxidizing Archaea. Here we show that H 2 O 2 can be surprisingly toxic to Thaumarchaeota from the Southern Ocean, with ammonia oxidation inhibited by additions of as little as 10 nM H 2 O 2 , while temperate Thaumarchaeota ecotypes were more tolerant. This sensitivity could explain the seasonal disappearance of Thaumarchaeota from polar surface waters and the increase in ammonia oxidation rates with depth commonly observed in marine environments. Our results highlight the need for further physiological studies of Thaumarchaeota, and indicate that ROS sensitivity could be used as a characteristic for dividing the group into meaningful ecotypes.

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Section: Discussionmentioning

confidence: 99%

Ammonia Oxidation in the Ocean Can Be Inhibited by Nanomolar Concentrations of Hydrogen Peroxide

et al. 2016

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“…We examine the role of phytoplankton excretion and differential photoinhibition (Olson 1981, Lomas & Lipschultz 2006 in producing the water column PNM. An additional suggested mechanism, differential photorecovery (Guerrero & Jones 1996b), is not considered here because it cannot operate under the hydrographic conditions in the GOA (see Supplement 2 at www.int-res.com/articles/ suppl/ m453 p011_ supp. pdf for explanation).…”

Section: Discussionmentioning

confidence: 99%

“…The vertical separation is hypothesized to stem either from differential photoinhibition (Olson 1981) or differential recovery of the activity of the nitrifiers following photoinhibition (Guerrero & Jones 1996b). These hypotheses are based on the finding that light inhibits the activity of nitrifying bacteria (Hooper & Terry 1974, Olson 1981, Guerrero & Jones 1996a).…”

Section: Introductionmentioning

confidence: 99%

Nitrite dynamics in the open ocean—clues from seasonal and diurnal variations

Meeder¹,

Mackey²,

Paytan³

et al. 2012

Mar. Ecol. Prog. Ser.

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Two alternative mechanisms are suggested for nitrite accumulation in the oxygenated oligotrophic water column: (1) excretion by phytoplankton or (2) microbial oxidation of ammonium (nitrification). This study assessed the role of these 2 mechanisms, based on seasonal and high-resolution diurnal depth profiles of the dissolved inorganic nitrogen (DIN) species (nitrite, ammonium, nitrate) and chlorophyll a in the Gulf of Aqaba, Red Sea. Both mechanisms operated in the water column, but in different seasons; nitrification was the prime process responsible for nitrite accumulation during the stratified summer season and phytoplankton nitrite excretion operated during winter mixing. At the onset of summer stratification two N peaks developed below the photic zone, an ammonium maximum (AM) and below it the primary nitrite maximum (PNM). Both peaks were located at a depth range where phytoplankton are thought to be inactive and not excreting nitrite. During summer stratification, the water column deep chlorophyll maximum (DCM), AM, PNM and the nitracline were ordered by a downward increase in N oxidation state similar to the temporal order of the N-species during nitrification. This similarity, together with the diurnal stability of the PNM and its co-existence with oscillating chlorophyll profiles above the DCM, is consistent with nitrification as the key process forming the PNM. We suggest that transport and reaction control the vertical order and separation of N-species in the water column. The ratios between the rate constants for ammonification, ammonium oxidation, nitrite oxidation and nitrate assimilation were estimated by a simple box model to be 1:3:1.5:0.15, respectively. These field estimates are similar to the ratios between the rate constants measured in laboratory experiments.

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“…Nitrifier activity has been found to be inhibited by light [Vanzella et al, 1989;Guerrero and Jones, 1996], although it may not be Global Biogeochemical Cycles…”

Section: Non-rayleigh Dynamics and Estimation Of Isotope Effectsmentioning

confidence: 99%

Enzyme‐level interconversion of nitrate and nitrite in the fall mixed layer of the Antarctic Ocean

Kemeny

Weigand

Zhang

et al. 2016

Global Biogeochemical Cycles

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Photoinhibition of marine nitrifying bacteria. II. Dark recovery after monochromatic or polychromatic irradiation

Cited by 59 publications

References 0 publications

Ammonia Oxidation in the Ocean Can Be Inhibited by Nanomolar Concentrations of Hydrogen Peroxide

Ammonia Oxidation in the Ocean Can Be Inhibited by Nanomolar Concentrations of Hydrogen Peroxide

Nitrite dynamics in the open ocean—clues from seasonal and diurnal variations

Enzyme‐level interconversion of nitrate and nitrite in the fall mixed layer of the Antarctic Ocean

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