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Phosphorus supply drives rapid turnover of membrane phospholipids in the diatom Thalassiosira pseudonana

Martin, Patrick; Van Mooy, Benjamin A.S.; Heithoff, Abigail; Dyhrman, Sonya. 2011 Phosphorus supply drives rapid turnover of membrane phospholipids in the diatom Thalassiosira pseudonana. The ISME Journal, 5 (6). 1057-1060. 10.1038/ismej.2010.192

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Abstract/Summary

In low-phosphorus (P) marine systems, phytoplankton replace membrane phospholipids with non-phosphorus lipids, but it is not known how rapidly this substitution occurs. Here, when cells of the model diatom Thalassiosira pseudonana were transferred from P-replete medium to P-free medium, the phospholipid content of the cells rapidly declined within 48 h from 45±0.9 to 21±4.5% of the total membrane lipids; the difference was made up by non-phosphorus lipids. Conversely, when P-limited T. pseudonana were resupplied with P, cells reduced the percentage of their total membrane lipids contributed by a non-phosphorus lipid from 43±1.5 to 7.3±0.9% within 24 h, whereas the contribution by phospholipids rose from 2.2±0.1 to 44±3%. This dynamic phospholipid reservoir contained sufficient P to synthesize multiple haploid genomes, suggesting that phospholipid turnover could be an important P source for cells. Field observations of phytoplankton lipid content may thus reflect short-term changes in P supply and cellular physiology, rather than simply long-term adjustment to the environment.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1038/ismej.2010.192
ISSN: 17517362
Date made live: 21 Mar 2011 10:26 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/277835

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