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| Publication Type | J |
| Authors | Quinta, R., P. W. Hill, D. L. Jones, R. Santos, D. N. Thomas and L. Le Vay |
| Title | Uptake of an amino acid (alanine) and its peptide (trialanine) by the saltmarsh halophytes Salicornia europaea and Aster tripolium and its potential role in ecosystem N cycling and marine aquaculture wastewater treatment |
| Source | Ecological Engineering |
| Author Keywords | Ammonium Nitrate Bioremediation Root transport Sediment nutrient cycling DISSOLVED ORGANIC NITROGEN INORGANIC CARBON UPTAKE BOREAL FOREST PLANTS SOIL MICROBES AMMONIUM NUTRIENT GLYCINE NITRATE ACQUISITION SEDIMENTS |
| Abstract | Dissolved organic nitrogen (DON) represents a significant reservoir of potentially plant available nitrogen (N) in saltmarsh ecosystems and wastewater treatment streams. Here we investigated the capacity of two halophytic plants used in wastewater remediation, Salicornia europaea and Aster tripolium, to access soluble organic forms of N when grown in water or soil-based culture. Incubation experiments with (NC)-N-15-C-13- and C-14-labelled alanine and trialanine, (NH4+)-N-15 and (NO3)-N-15 indicated that both S. europaea and A. tripolium can take up and assimilate amino acids (alanine) and oligopeptides (trialanine), in addition to NH4+ and NO3. In hydroponic solutions the uptake of alanine-N and trialanine-N was comparable to that of NO3, but lower than NH4+. Comparison of the C-13 and N-15 ratios in the plant tissues suggested that at least 70% of the alanine and trialanine was taken up intact from solution. Plant capture of exogenously applied N by the soil-grown plants was much lower than in the hydroponically-grown plants. We ascribe this reduced rate of plant N uptake to increased microbial competition for DON, lower rates of N delivery to the root surface (from reduced mass flow and diffusion) and sorption of N solutes to the solid matrix. 14C-labelled amino acid and peptides indicated rapid assimilation of the DON once taken up by the plants. Our results strongly suggest that hydroponically grown S. europaea and A. tripolium are capable of taking up DON at high rates showing that it is highly pertinent to consider DON removal in the phytoremediation of wastewater. In addition, this is the first indication of direct peptide uptake by halophytic plants. We conclude that halophytes have evolved the capacity to take up a wide range of N compounds to satisfy their N demand when growing in N-limiting saltmarsh environments and that this intrinsic potential can be harnessed for wastewater treatment. (C) 2014 Elsevier B.V. All rights reserved. |
| Author Address | [Quinta, R.; Le Vay, L.] Bangor Univ, Ctr Appl Marine Sci, Menai Bridge LL59 5AB, Anglesey, Wales. [Quinta, R.; Thomas, D. N.; Le Vay, L.] Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales. [Hill, P. W.; Jones, D. L.] Bangor Univ, Environm Ctr Wales, Bangor LL57 2UW, Gwynedd, Wales. [Santos, R.] Univ Algarve, Ctr Marine Sci, Marine Plant Ecol Res Grp, CCMAR, P-8005139 Faro, Portugal. [Thomas, D. N.] Finnish Environm Inst SYKE, Ctr Marine Res, FI-00251 Helsinki, Finland. Quinta, R (reprint author), Bangor Univ, Ctr Appl Marine Sci, Askew St, Menai Bridge LL59 5AB, Anglesey, Wales. r.quinta@bangor.ac.uk |
| ISSN | 0925-8574 |
| ISBN | 0925-8574 |
| 29-Character Source Abbreviation | Ecol. Eng. |
| Publication Date | Feb |
| Year Published | 2015 |
| Volume | 75 |
| Beginning Page | 145-154 |
| Digital Object Identifier (DOI) | 10.1016/j.ecoleng.2014.11.049 |
| Unique Article Identifier | WOS:000349598200019 |
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