Intraspecific variability in Phaeocystis antarctica's response to iron and light stress
Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compa...
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ftpubmed:oai:pubmedcentral.nih.gov:5503234 2023-05-15T13:56:27+02:00 Intraspecific variability in Phaeocystis antarctica's response to iron and light stress Luxem, Katja E. Ellwood, Michael J. Strzepek, Robert F. 2017-07-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503234/ http://www.ncbi.nlm.nih.gov/pubmed/28692685 https://doi.org/10.1371/journal.pone.0179751 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503234/ http://www.ncbi.nlm.nih.gov/pubmed/28692685 http://dx.doi.org/10.1371/journal.pone.0179751 © 2017 Luxem et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2017 ftpubmed https://doi.org/10.1371/journal.pone.0179751 2017-07-30T00:03:34Z Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compare the growth, cell size and chlorophyll a concentrations of four P. antarctica clones cultured under different iron and light conditions. Iron was provided either as unchelated iron (Fe′) or bound to the bacterial siderophore desferrioxamine B, representing, respectively, the most and least bioavailable forms of iron which phytoplankton encounter in the marine environment. The growth rate data demonstrate that the clones vary in their ability to grow using organically bound iron, and that this ability is not related to their ability to grow at low inorganic iron concentrations. These results are consistent at low and high light. Physiologically, only three of the four clones shrink or decrease the concentration of chlorophyll a in response to iron limitation, and only one clone decreases colony formation. Together, our data show that P. antarctica clones 1) respond to the same degree of iron limitation using different acclimation strategies, and 2) vary in their ability to grow under the same external iron and light conditions. This physiological diversity is surprisingly large for isolates of a single phytoplankton species. Text Antarc* Antarctica Southern Ocean PubMed Central (PMC) Southern Ocean PLOS ONE 12 7 e0179751 |
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Research Article Luxem, Katja E. Ellwood, Michael J. Strzepek, Robert F. Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
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Research Article |
description |
Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compare the growth, cell size and chlorophyll a concentrations of four P. antarctica clones cultured under different iron and light conditions. Iron was provided either as unchelated iron (Fe′) or bound to the bacterial siderophore desferrioxamine B, representing, respectively, the most and least bioavailable forms of iron which phytoplankton encounter in the marine environment. The growth rate data demonstrate that the clones vary in their ability to grow using organically bound iron, and that this ability is not related to their ability to grow at low inorganic iron concentrations. These results are consistent at low and high light. Physiologically, only three of the four clones shrink or decrease the concentration of chlorophyll a in response to iron limitation, and only one clone decreases colony formation. Together, our data show that P. antarctica clones 1) respond to the same degree of iron limitation using different acclimation strategies, and 2) vary in their ability to grow under the same external iron and light conditions. This physiological diversity is surprisingly large for isolates of a single phytoplankton species. |
format |
Text |
author |
Luxem, Katja E. Ellwood, Michael J. Strzepek, Robert F. |
author_facet |
Luxem, Katja E. Ellwood, Michael J. Strzepek, Robert F. |
author_sort |
Luxem, Katja E. |
title |
Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
title_short |
Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
title_full |
Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
title_fullStr |
Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
title_full_unstemmed |
Intraspecific variability in Phaeocystis antarctica's response to iron and light stress |
title_sort |
intraspecific variability in phaeocystis antarctica's response to iron and light stress |
publisher |
Public Library of Science |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503234/ http://www.ncbi.nlm.nih.gov/pubmed/28692685 https://doi.org/10.1371/journal.pone.0179751 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503234/ http://www.ncbi.nlm.nih.gov/pubmed/28692685 http://dx.doi.org/10.1371/journal.pone.0179751 |
op_rights |
© 2017 Luxem et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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CC-BY |
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https://doi.org/10.1371/journal.pone.0179751 |
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PLOS ONE |
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12 |
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