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

Citation

Fernandez, PA and Roleda, MY and Leal, PP and Hepburn, CD and Hurd, CL, Tissue nitrogen status does not alter the physiological responses of Macrocystis pyrifera to ocean acidification, Marine Biology, 164 Article 177. ISSN 0025-3162 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 Springer-Verlag GmbH Germany

DOI: doi:10.1007/s00227-017-3204-z

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.

Item Details

Item Type:Refereed Article
Keywords:seaweed, ocean acidification, nitrogen metabolism, multiple stressor
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Ecosystem Adaptation to Climate Change
Author:Hurd, CL (Associate Professor Catriona Hurd)
ID Code:120112
Year Published:2017
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-08-10
Last Modified:2017-09-13
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