Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region
Nitrate reductase (NR) activity and 15NO3‒ uptake in phytoplankton were compared under different environmental conditions on two cruises in the upwelling region off Peru. The NR activity and NO3‒ uptake rates responded differently to light and nutrients and the differences led to variations in the uptake; reductase ratio. Analysis of these variations suggests that the re-equilibration time of the two processes in response to environmental perturbation is an important source of variability. The nitrate uptake system responds faster than the nitrate reductase system. Considering these differences in response time, the basic differences in the two processes, and the differences in their measurement, we conclude that the NR activity measures the current nitrate-reducing potential, which reflects NO3‒ assimilation before the sampling time, while 15NO3‒ uptake measures NO3‒ assimilation in the 6-h period following sampling. Thus, considering the sampling time as a point of reference, the former is a measure of the past and the latter is a measure of the future
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1984-03
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dig-icm-es-10261-2557652022-08-19T08:53:58Z Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region Blasco, Dolors Maclsaac, J. J. Packard, Theodore T. Dugdale, Richard C. National Science Foundation (US) Nitrate reductase (NR) activity and 15NO3‒ uptake in phytoplankton were compared under different environmental conditions on two cruises in the upwelling region off Peru. The NR activity and NO3‒ uptake rates responded differently to light and nutrients and the differences led to variations in the uptake; reductase ratio. Analysis of these variations suggests that the re-equilibration time of the two processes in response to environmental perturbation is an important source of variability. The nitrate uptake system responds faster than the nitrate reductase system. Considering these differences in response time, the basic differences in the two processes, and the differences in their measurement, we conclude that the NR activity measures the current nitrate-reducing potential, which reflects NO3‒ assimilation before the sampling time, while 15NO3‒ uptake measures NO3‒ assimilation in the 6-h period following sampling. Thus, considering the sampling time as a point of reference, the former is a measure of the past and the latter is a measure of the future Financial support for this work was provided by the office of IDOE under NSF grants OCE-7600136 and OCE-7727006 to R. C. Dugdale, grants OCE-7523718, OCE-7800610, and OCE-801 1187 to T. T. Packard, and grant OCE-8O11216 to D. Blasco Peer reviewed 2021-12-10T13:35:57Z 2021-12-10T13:35:57Z 1984-03 artículo http://purl.org/coar/resource_type/c_6501 Limnology and Oceanography 29(2): 275-286 (1984) 0024-3590 http://hdl.handle.net/10261/255765 10.4319/lo.1984.29.2.0275 http://dx.doi.org/10.13039/100000001 en https://doi.org/10.4319/lo.1984.29.2.0275 Sí open Association for the Sciences of Limnology and Oceanography |
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Nitrate reductase (NR) activity and 15NO3‒ uptake in phytoplankton were compared under different environmental conditions on two cruises in the upwelling region off Peru. The NR activity and NO3‒ uptake rates responded differently to light and nutrients and the differences led to variations in the uptake; reductase ratio. Analysis of these variations suggests that the re-equilibration time of the two processes in response to environmental perturbation is an important source of variability. The nitrate uptake system responds faster than the nitrate reductase system. Considering these differences in response time, the basic differences in the two processes, and the differences in their measurement, we conclude that the NR activity measures the current nitrate-reducing potential, which reflects NO3‒ assimilation before the sampling time, while 15NO3‒ uptake measures NO3‒ assimilation in the 6-h period following sampling. Thus, considering the sampling time as a point of reference, the former is a measure of the past and the latter is a measure of the future |
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National Science Foundation (US) |
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National Science Foundation (US) Blasco, Dolors Maclsaac, J. J. Packard, Theodore T. Dugdale, Richard C. |
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Blasco, Dolors Maclsaac, J. J. Packard, Theodore T. Dugdale, Richard C. |
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Blasco, Dolors Maclsaac, J. J. Packard, Theodore T. Dugdale, Richard C. Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
author_sort |
Blasco, Dolors |
title |
Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
title_short |
Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
title_full |
Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
title_fullStr |
Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
title_full_unstemmed |
Relationship between nitrate reductase and nitrate uptake in phytoplankton in the Peru upwelling region |
title_sort |
relationship between nitrate reductase and nitrate uptake in phytoplankton in the peru upwelling region |
publisher |
Association for the Sciences of Limnology and Oceanography |
publishDate |
1984-03 |
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http://hdl.handle.net/10261/255765 http://dx.doi.org/10.13039/100000001 |
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1777667592290304000 |