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Rising water temperatures alter lipid dynamics and reduce n-3 essential fatty acid concerntrations in Scenedesmus obliquus (chlorophyta)

Fuschino, Jenny, Guschina, Irina, Dobson, Gary, Yan, Norman, Harwood, John L. and Arts, Michael 2011. Rising water temperatures alter lipid dynamics and reduce n-3 essential fatty acid concerntrations in Scenedesmus obliquus (chlorophyta). Journal of Phycology 47 (4) , pp. 763-774. 10.1111/j.1529-8817.2011.01024.x

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Abstract

The biosynthesis of nutritionally important polyunsaturated fatty acids (PUFAs) in phytoplankton is influenced by environmental temperature. We investigated the potential of climate warming to alter lipid dynamics of Scenedesmus obliquus (Turpin) Kütz. by comparing lipid and fatty acid (FA) profiles as well as FA metabolism (using [1-14C] acetate) at 20°C and 28°C. We documented an overall decline (53%–37%) in the proportion of n-3 PUFA (in particular, of -linolenic acid [ALA; 18:3n-3]), and a concomitant increase in saturated fatty acids (SAFAs) in total lipids (TLs) at 28°C, consistent with enhanced incorporation of radioactivity from [1-14C] acetate into total 16:0, 18:1, and decreased incorporation into 18:2 and 18:3 FA (from 36% to 22% of the total) at 28°C. Glycerophospholipids were also affected by warming; ALA and stearidonic acids (SDAs; 18:4n-3) both decreased (by 13% and 15%, respectively) in phosphatidylcholine (PC) and (by 24% and 20%, respectively) in phosphatidylethanolamine (PE). The characteristic FA in phosphatidylglycerol (PG; 16:1n-13t) increased (by 22%) at 28°C. The activities of desaturases, which add double bonds to FA moieties, comprised the major suite of reactions affected by the temperature increase in TL and polar lipid (PL) classes. Climate modelers predict an increase in the number of extreme heat days in summer at temperate latitudes, with parallel projected increases in water temperatures of shallow water bodies. Our results suggest that the overall decrease in the essential n-3 FA ALA in S. obliquus at higher water temperatures may lower food quality for higher tropic levels, adding another climate-warming stress.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > Q Science (General)
Uncontrolled Keywords: chlorophyte; climate change; essential fatty acids; polar lipids; radiolabel; Scenedesmus; temperature; unsaturation
Publisher: Wiley
ISSN: 0022-3646
Last Modified: 04 Jun 2017 03:35
URI: http://orca.cf.ac.uk/id/eprint/23191

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