Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms
Iron availability affects the growth of not only phytoplankton, but also sea ice diatoms.Iron availability had a clear effect on the growth rates of Fragilariopsis cylindrus and F. curta. Maximumgrowth rates were 0.57 dC1 for F. cylindrus and 0.28 dC1 for F. curta; Km (half-saturation growthconstant...
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ftunivtasecite:oai:ecite.utas.edu.au:54382 2023-05-15T13:40:51+02:00 Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms Pankowski, A McMinn, A 2009 application/pdf http://www.int-res.com/ https://doi.org/10.3354/ab00116 http://ecite.utas.edu.au/54382 en eng Inter-Research http://ecite.utas.edu.au/54382/1/Pankowski2009.pdf http://dx.doi.org/10.3354/ab00116 Pankowski, A and McMinn, A, Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms, Aquatic Biology, 4, (3) pp. 273-288. ISSN 1864-7790 (2009) [Refereed Article] http://ecite.utas.edu.au/54382 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2009 ftunivtasecite https://doi.org/10.3354/ab00116 2019-12-13T21:27:22Z Iron availability affects the growth of not only phytoplankton, but also sea ice diatoms.Iron availability had a clear effect on the growth rates of Fragilariopsis cylindrus and F. curta. Maximumgrowth rates were 0.57 dC1 for F. cylindrus and 0.28 dC1 for F. curta; Km (half-saturation growthconstant) was 0.51 10C12 and 1.3 10C12 M for F. cylindrus and F. curta, respectively. For both F.cylindrus and F. curta, Fv/Fm (quantum yield of fluorescence) was highest and lowest for the culturesgrown with the highest and lowest concentrations of iron, respectively. For both species there wasalso a reduction in both rETRmax (maximum relative electron transfer rate) and (photosynthetic efficiency)with decreasing iron concentration. For F. cylindrus grown with the least iron, rETRmax washalf of the iron-replete value, while was reduced by 65%. Changes in Ek (light-adaptation parameter)were not well defined. Immunoassays were developed for the proteins ferredoxin and flavodoxinin Antarctic pack ice. Iron availability had different effects on the expression of flavodoxin andferredoxin in the 2 Fragilariopsis species tested. Cultures of F. cylindrus grown at high iron concentrationproduced predominantly ferredoxin, with a small amount of flavodoxin. Ferredoxin wassequentially replaced by flavodoxin for cultures grown with less iron, although the response was nota simple switch from one protein to the other. The ability to produce ferredoxin is apparently absentin F. curta, with relatively constant levels of flavodoxin produced at all iron concentrations. Theseresults strongly imply that the presence of flavodoxin alone cannot be used as evidence of ironlimitedgrowth. Article in Journal/Newspaper Antarc* Antarctic Sea ice eCite UTAS (University of Tasmania) Antarctic Aquatic Biology 4 273 288 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Pankowski, A McMinn, A Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
Iron availability affects the growth of not only phytoplankton, but also sea ice diatoms.Iron availability had a clear effect on the growth rates of Fragilariopsis cylindrus and F. curta. Maximumgrowth rates were 0.57 dC1 for F. cylindrus and 0.28 dC1 for F. curta; Km (half-saturation growthconstant) was 0.51 10C12 and 1.3 10C12 M for F. cylindrus and F. curta, respectively. For both F.cylindrus and F. curta, Fv/Fm (quantum yield of fluorescence) was highest and lowest for the culturesgrown with the highest and lowest concentrations of iron, respectively. For both species there wasalso a reduction in both rETRmax (maximum relative electron transfer rate) and (photosynthetic efficiency)with decreasing iron concentration. For F. cylindrus grown with the least iron, rETRmax washalf of the iron-replete value, while was reduced by 65%. Changes in Ek (light-adaptation parameter)were not well defined. Immunoassays were developed for the proteins ferredoxin and flavodoxinin Antarctic pack ice. Iron availability had different effects on the expression of flavodoxin andferredoxin in the 2 Fragilariopsis species tested. Cultures of F. cylindrus grown at high iron concentrationproduced predominantly ferredoxin, with a small amount of flavodoxin. Ferredoxin wassequentially replaced by flavodoxin for cultures grown with less iron, although the response was nota simple switch from one protein to the other. The ability to produce ferredoxin is apparently absentin F. curta, with relatively constant levels of flavodoxin produced at all iron concentrations. Theseresults strongly imply that the presence of flavodoxin alone cannot be used as evidence of ironlimitedgrowth. |
format |
Article in Journal/Newspaper |
author |
Pankowski, A McMinn, A |
author_facet |
Pankowski, A McMinn, A |
author_sort |
Pankowski, A |
title |
Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
title_short |
Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
title_full |
Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
title_fullStr |
Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
title_full_unstemmed |
Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms |
title_sort |
iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in antarctic sea ice diatoms |
publisher |
Inter-Research |
publishDate |
2009 |
url |
http://www.int-res.com/ https://doi.org/10.3354/ab00116 http://ecite.utas.edu.au/54382 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
http://ecite.utas.edu.au/54382/1/Pankowski2009.pdf http://dx.doi.org/10.3354/ab00116 Pankowski, A and McMinn, A, Iron availability regulates growth, photosynthesis, and production of ferredoxin and flavodoxin in Antarctic sea ice diatoms, Aquatic Biology, 4, (3) pp. 273-288. ISSN 1864-7790 (2009) [Refereed Article] http://ecite.utas.edu.au/54382 |
op_doi |
https://doi.org/10.3354/ab00116 |
container_title |
Aquatic Biology |
container_volume |
4 |
container_start_page |
273 |
op_container_end_page |
288 |
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1766141534630051840 |