Effects of high salinity from desalination brine on growth, photosynthesis, water relations and osmolyte concentrations of seagrass Posidonia australis.

Autor: Cambridge ML; UWA Oceans Institute and School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia. Electronic address: marion.cambridge@uwa.edu.au., Zavala-Perez A; UWA Oceans Institute and School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia., Cawthray GR; School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia., Mondon J; School of Life and Environmental Science, Deakin University, PO Box 423, Warrnambool, Victoria 3280, Australia., Kendrick GA; UWA Oceans Institute and School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2017 Feb 15; Vol. 115 (1-2), pp. 252-260. Date of Electronic Publication: 2016 Dec 16.
DOI: 10.1016/j.marpolbul.2016.11.066
Abstrakt: Highly saline brines from desalination plants expose seagrass communities to salt stress. We examined effects of raised salinity (46 and 54psu) compared with seawater controls (37psu) over 6weeks on the seagrass, Posidonia australis, growing in tanks with the aim of separating effects of salinity from other potentially deleterious components of brine and determining appropriate bioindicators. Plants survived exposures of 2-4weeks at 54psu, the maximum salinity of brine released from a nearby desalination plant. Salinity significantly reduced maximum quantum yield of PSII (chlorophyll a fluorescence emissions). Leaf water potential (Ψ w ) and osmotic potential (Ψ π ) were more negative at increased salinity, while turgor pressure (Ψ p ) was unaffected. Leaf concentrations of K + and Ca 2+ decreased, whereas concentrations of sugars (mainly sucrose) and amino acids increased. We recommend leaf osmolarity, ion, sugar and amino acid concentrations as bioindicators for salinity effects, associated with brine released in desalination plant outfalls.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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