Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus
Phytoplankton communities in the Ross Sea, Antarctica, are characterized by the haptophyte Phaeocystis antarctica Karsten, which dominates deep mixed layers, and diatoms, including Fragilariopsis cylindrus Grunow, that thrive in shallower mixed layers. To investigate whether differences in photoprot...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2009.54.4.1176 2024-10-13T14:03:14+00:00 Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus Kropuenske, Lindsey R. Mills, Matthew M. van Dijken, Gert L. Bailey, Shaun Robinson, Dale H. Welschmeyer, Nicholas A. Arrigoa, Kevin R. 2009 http://dx.doi.org/10.4319/lo.2009.54.4.1176 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2009.54.4.1176 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2009.54.4.1176 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 54, issue 4, page 1176-1196 ISSN 0024-3590 1939-5590 journal-article 2009 crwiley https://doi.org/10.4319/lo.2009.54.4.1176 2024-09-17T04:49:19Z Phytoplankton communities in the Ross Sea, Antarctica, are characterized by the haptophyte Phaeocystis antarctica Karsten, which dominates deep mixed layers, and diatoms, including Fragilariopsis cylindrus Grunow, that thrive in shallower mixed layers. To investigate whether differences in photoprotective strategies explain these distributions, photosynthetic parameters, pigments, and fluorescence properties were measured in cultures grown under several irradiance regimes and during acclimation to increased irradiance. In P. antarctica , cellular concentrations of all pigments declined with increasing growth irradiance under continuous light, but xanthophyll cycle pigment concentrations increased with increasing irradiance under dynamic conditions without changes in chlorophyll. In contrast, F. cylindrus exhibited declines in chlorophyll cell −1 with increasing irradiance under both continuous and dynamic conditions, but xanthophyll cycle cell21 pigments increased under continuous irradiance and declined under dynamic irradiance. P. antarctica did not exhibit non‐photochemical quenching (NPQ) unless exposed to irradiance in excess of the mean growth irradiance. F. cylindrus exhibited NPQ in response to lower irradiances but displayed less photoinhibitory quenching than P. antarctica after exposure to very high irradiance. Inhibitor experiments suggest that both taxa rely upon xanthophyll cycle photoprotection to maintain photosynthetic performance but only P. antarctica relies heavily upon protein synthesis, presumably for D1 protein repair. F. cylindrus can thrive in shallow mixed layers because its high capacity for heat dissipation minimizes photoinhibition. P. antarctica utilizes xanthophyll cycle photoprotection to a lesser degree, but is able to dominate deeper mixed layers by effectively repairing the photodamage incurred when it is mixed to the surface. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Southern Ocean Wiley Online Library Ross Sea Southern Ocean Limnology and Oceanography 54 4 1176 1196 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Phytoplankton communities in the Ross Sea, Antarctica, are characterized by the haptophyte Phaeocystis antarctica Karsten, which dominates deep mixed layers, and diatoms, including Fragilariopsis cylindrus Grunow, that thrive in shallower mixed layers. To investigate whether differences in photoprotective strategies explain these distributions, photosynthetic parameters, pigments, and fluorescence properties were measured in cultures grown under several irradiance regimes and during acclimation to increased irradiance. In P. antarctica , cellular concentrations of all pigments declined with increasing growth irradiance under continuous light, but xanthophyll cycle pigment concentrations increased with increasing irradiance under dynamic conditions without changes in chlorophyll. In contrast, F. cylindrus exhibited declines in chlorophyll cell −1 with increasing irradiance under both continuous and dynamic conditions, but xanthophyll cycle cell21 pigments increased under continuous irradiance and declined under dynamic irradiance. P. antarctica did not exhibit non‐photochemical quenching (NPQ) unless exposed to irradiance in excess of the mean growth irradiance. F. cylindrus exhibited NPQ in response to lower irradiances but displayed less photoinhibitory quenching than P. antarctica after exposure to very high irradiance. Inhibitor experiments suggest that both taxa rely upon xanthophyll cycle photoprotection to maintain photosynthetic performance but only P. antarctica relies heavily upon protein synthesis, presumably for D1 protein repair. F. cylindrus can thrive in shallow mixed layers because its high capacity for heat dissipation minimizes photoinhibition. P. antarctica utilizes xanthophyll cycle photoprotection to a lesser degree, but is able to dominate deeper mixed layers by effectively repairing the photodamage incurred when it is mixed to the surface. |
format |
Article in Journal/Newspaper |
author |
Kropuenske, Lindsey R. Mills, Matthew M. van Dijken, Gert L. Bailey, Shaun Robinson, Dale H. Welschmeyer, Nicholas A. Arrigoa, Kevin R. |
spellingShingle |
Kropuenske, Lindsey R. Mills, Matthew M. van Dijken, Gert L. Bailey, Shaun Robinson, Dale H. Welschmeyer, Nicholas A. Arrigoa, Kevin R. Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
author_facet |
Kropuenske, Lindsey R. Mills, Matthew M. van Dijken, Gert L. Bailey, Shaun Robinson, Dale H. Welschmeyer, Nicholas A. Arrigoa, Kevin R. |
author_sort |
Kropuenske, Lindsey R. |
title |
Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
title_short |
Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
title_full |
Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
title_fullStr |
Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
title_full_unstemmed |
Photophysiology in two major Southern Ocean phytoplankton taxa: Photoprotection in Phaeocystis antarctica and Fragilariopsis cylindrus |
title_sort |
photophysiology in two major southern ocean phytoplankton taxa: photoprotection in phaeocystis antarctica and fragilariopsis cylindrus |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.4319/lo.2009.54.4.1176 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2009.54.4.1176 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2009.54.4.1176 |
geographic |
Ross Sea Southern Ocean |
geographic_facet |
Ross Sea Southern Ocean |
genre |
Antarc* Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica Ross Sea Southern Ocean |
op_source |
Limnology and Oceanography volume 54, issue 4, page 1176-1196 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2009.54.4.1176 |
container_title |
Limnology and Oceanography |
container_volume |
54 |
container_issue |
4 |
container_start_page |
1176 |
op_container_end_page |
1196 |
_version_ |
1812819648983334912 |