Variation in amino acid content and its relationship to nitrogen content and growth rate in Ulva ohnoi (Chlorophyta)

A R Angell; L Mata; R de Nys; Nicholas A Paul

doi:10.1111/jpy.12154

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Variation in amino acid content and its relationship to nitrogen content and growth rate in Ulva ohnoi (Chlorophyta)

Journal article

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Variation in amino acid content and its relationship to nitrogen content and growth rate in Ulva ohnoi (Chlorophyta)

A R Angell, L Mata, R de Nys and Nicholas A Paul

Journal of Phycology, Vol.50(1), pp.216-226

2014

DOI: https://doi.org/10.1111/jpy.12154

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Abstract

algae

animal nutrition

arginine

critical nitrogen

glutamic acid

glutamine

luxury uptake

lysine

methionine

nitrogen flux

To evaluate the quantitative and qualitative changes in amino acids related to internal nitrogen content and growth rate of Ulva ohnoi, the supply of nitrogen to outdoor cultures of the seaweed was manipulated by simultaneously varying water nitrogen concentrations and renewal rate. Both internal nitrogen content and growth rate varied substantially, and the quantitative and qualitative changes in amino acids were described in the context of three internal nitrogen states: nitrogen-limited, metabolic, and luxury. The nitrogen limited state was defined by increases in all amino acids with increasing nitrogen content and growth up until 1.2% internal nitrogen. The metabolic nitrogen state was defined by increases in all amino acids with increasing internal nitrogen content up to 2.6%, with no increases in growth rate. Luxury state was defined by internal nitrogen content above 2.6%, which occurred only when nitrogen availability was high but growth rates were reduced. In this luxury circumstance, excess nitrogen was accumulated as free amino acids, in two phases. The first phase was distinguished by a small increase in the majority of amino acids up to â‰ˆ3.3% internal nitrogen, and the second by a large increase in glutamic acid, glutamine, and arginine up to 4.2% internal nitrogen. These results demonstrate that the relationship between internal nitrogen content and amino acid quality is dynamic but predictable, and could be used for the selective culture of seaweeds. © 2013 Phycological Society of America.

Details

Title: Variation in amino acid content and its relationship to nitrogen content and growth rate in Ulva ohnoi (Chlorophyta)
Authors: A R Angell (Author) - James Cook University
L Mata (Author) - James Cook University
R de Nys (Author) - James Cook University
Nicholas A Paul (Author) - James Cook University
Publication details: Journal of Phycology, Vol.50(1), pp.216-226
Publisher: Wiley-Blackwell Publishing Inc.
Date published: 2014
DOI: 10.1111/jpy.12154
ISSN: 0022-3646
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451191502621
Output Type: Journal article

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