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Tissue nitrogen status does not alter the physiological responses of Macrocystis pyrifera to ocean acidification

Tissue nitrogen status does not alter the physiological responses of Macrocystis pyrifera to... Evaluating the relative effects of local (e.g. eutrophication) and global (e.g. ocean acidification, OA) environmental change is important to predict how marine macroalgae might respond to future oceanic conditions. In this study, the effects of nitrate supply, and hence tissue nitrogen status, and OA on the N metabolism, growth and photosynthetic rates of the kelp Macrocystis pyrifera were examined. We hypothesized that (1) NO3 − uptake and assimilation processes will depend on nitrate supply and (2) tissue N status modulates the physiological response of Macrocystis to OA. Macrocystis blades were grown for 3 days under replete or deplete NO3 − concentrations. Thereafter, the NO3 − replete and deplete blades were grown for 3 days under current and future pCO2/pH conditions, with NO3 − enriched SW. After the initial pre-experimental incubation, total tissue N content, nitrate reductase (NR) activity and internal NO3 − pools were reduced under low [NO3 −], while NO3 − uptake rates increased. Initial tissue N status did not modulate the physiological response to OA. However, NO3 − uptake rates and NR activity were enhanced under the OA treatment regardless of the initial tissue N status, suggesting that increases in [H+]/reduced pH might play a regulating role in the N metabolism of this species. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Tissue nitrogen status does not alter the physiological responses of Macrocystis pyrifera to ocean acidification

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References (90)

Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Environment; Marine & Freshwater Sciences; Freshwater & Marine Ecology; Oceanography; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/s00227-017-3204-z
Publisher site
See Article on Publisher Site

Abstract

Evaluating the relative effects of local (e.g. eutrophication) and global (e.g. ocean acidification, OA) environmental change is important to predict how marine macroalgae might respond to future oceanic conditions. In this study, the effects of nitrate supply, and hence tissue nitrogen status, and OA on the N metabolism, growth and photosynthetic rates of the kelp Macrocystis pyrifera were examined. We hypothesized that (1) NO3 − uptake and assimilation processes will depend on nitrate supply and (2) tissue N status modulates the physiological response of Macrocystis to OA. Macrocystis blades were grown for 3 days under replete or deplete NO3 − concentrations. Thereafter, the NO3 − replete and deplete blades were grown for 3 days under current and future pCO2/pH conditions, with NO3 − enriched SW. After the initial pre-experimental incubation, total tissue N content, nitrate reductase (NR) activity and internal NO3 − pools were reduced under low [NO3 −], while NO3 − uptake rates increased. Initial tissue N status did not modulate the physiological response to OA. However, NO3 − uptake rates and NR activity were enhanced under the OA treatment regardless of the initial tissue N status, suggesting that increases in [H+]/reduced pH might play a regulating role in the N metabolism of this species.

Journal

Marine Biology – Springer Journals

Published: Aug 9, 2017

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