Phosphorus supply drives rapid turnover of membrane phospholipids in the diatom Thalassiosira pseudonana
Date
2010-11Author
Martin, Patrick
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Van Mooy, Benjamin A. S.
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Heithoff, Abigail
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Dyhrman, Sonya T.
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https://hdl.handle.net/1912/4910As published
https://doi.org/10.1038/ismej.2010.192Keyword
Betaine lipids; DGCC; Lipid substitution; Non-phosphorus lipids; Phosphatidylcholine; DiatomsAbstract
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 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 lipid
contributed by a non-phosphorus lipid from 43±1.5% to 7.3±0.9% within 24 h, while 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.
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Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in The ISME Journal 5 (2011): 1057–1060, doi:10.1038/ismej.2010.192.
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Preprint: Martin, Patrick, Van Mooy, Benjamin A. S., Heithoff, Abigail, Dyhrman, Sonya T., "Phosphorus supply drives rapid turnover of membrane phospholipids in the diatom Thalassiosira pseudonana", 2010-11, https://doi.org/10.1038/ismej.2010.192, https://hdl.handle.net/1912/4910Related items
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