Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank
Sea ice algae contribute up to 25% of the primary productivity of polar seas and seed large‐scale ice‐edge blooms. Fluctuations in temperature, salinity, and light associated with the freeze/thaw cycle can significantly impact the photophysiology of ice‐associated taxa. The effects of multiple co‐st...
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Online Access: | https://doi.org/10.1111/jpy.13036 http://www.ncbi.nlm.nih.gov/pubmed/32464687 http://ecite.utas.edu.au/140793 |
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ftunivtasecite:oai:ecite.utas.edu.au:140793 2023-05-15T16:36:33+02:00 Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank Yoshida, K Seger, A Kennedy, F McMinn, A Suzuki, K 2020 https://doi.org/10.1111/jpy.13036 http://www.ncbi.nlm.nih.gov/pubmed/32464687 http://ecite.utas.edu.au/140793 en eng Blackwell Publishing Inc http://dx.doi.org/10.1111/jpy.13036 Yoshida, K and Seger, A and Kennedy, F and McMinn, A and Suzuki, K, Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank, Journal of Phycology, 56, (5) pp. 1323-1338. ISSN 0022-3646 (2020) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/32464687 http://ecite.utas.edu.au/140793 Biological Sciences Plant biology Phycology (incl. marine grasses) Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1111/jpy.13036 2022-07-11T22:16:56Z Sea ice algae contribute up to 25% of the primary productivity of polar seas and seed large‐scale ice‐edge blooms. Fluctuations in temperature, salinity, and light associated with the freeze/thaw cycle can significantly impact the photophysiology of ice‐associated taxa. The effects of multiple co‐stressors (i.e., freezing temperature and high brine salinity or sudden high light exposure) on the photophysiology of ice algae were investigated in a series of ice tank experiments with the polar diatom Fragilariopsis cylindrus under different light intensities. When algal cells were frozen into the ice, the maximum quantum yield of photosystem II photochemistry (PSII; F v / F m ) decreased possibly due to the damage of PSII reaction centers and/or high brine salinity stress suppressing the reduction capacity downstream of PSII. Expression of the rbc L gene was highly up‐regulated, suggesting that cells initiated strategies to enhance survival upon freezing in. Algae contained within the ice‐matrix displayed similar levels of F v / F m regardless of the light treatments. Upon melting out, cells were exposed to high light (800μmol photonsm −2 s −1 ), resulting in a rapid decline in F v / F m and significant up‐regulation of non‐photochemical quenching (NPQ). These results suggest that ice algae employed safety valves (i.e., NPQ) to maintain their photosynthetic capability during the sudden environmental changes. Our results infer that sea ice algae are highly adaptable when exposed to multiple co‐stressors and that their success can, in part, be explained by the ability to rapidly modify their photosynthetic competence a key factor contributing to algal bloom formation in the polar seas. Article in Journal/Newspaper ice algae Sea ice eCite UTAS (University of Tasmania) Journal of Phycology 56 5 1323 1338 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Plant biology Phycology (incl. marine grasses) |
spellingShingle |
Biological Sciences Plant biology Phycology (incl. marine grasses) Yoshida, K Seger, A Kennedy, F McMinn, A Suzuki, K Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
topic_facet |
Biological Sciences Plant biology Phycology (incl. marine grasses) |
description |
Sea ice algae contribute up to 25% of the primary productivity of polar seas and seed large‐scale ice‐edge blooms. Fluctuations in temperature, salinity, and light associated with the freeze/thaw cycle can significantly impact the photophysiology of ice‐associated taxa. The effects of multiple co‐stressors (i.e., freezing temperature and high brine salinity or sudden high light exposure) on the photophysiology of ice algae were investigated in a series of ice tank experiments with the polar diatom Fragilariopsis cylindrus under different light intensities. When algal cells were frozen into the ice, the maximum quantum yield of photosystem II photochemistry (PSII; F v / F m ) decreased possibly due to the damage of PSII reaction centers and/or high brine salinity stress suppressing the reduction capacity downstream of PSII. Expression of the rbc L gene was highly up‐regulated, suggesting that cells initiated strategies to enhance survival upon freezing in. Algae contained within the ice‐matrix displayed similar levels of F v / F m regardless of the light treatments. Upon melting out, cells were exposed to high light (800μmol photonsm −2 s −1 ), resulting in a rapid decline in F v / F m and significant up‐regulation of non‐photochemical quenching (NPQ). These results suggest that ice algae employed safety valves (i.e., NPQ) to maintain their photosynthetic capability during the sudden environmental changes. Our results infer that sea ice algae are highly adaptable when exposed to multiple co‐stressors and that their success can, in part, be explained by the ability to rapidly modify their photosynthetic competence a key factor contributing to algal bloom formation in the polar seas. |
format |
Article in Journal/Newspaper |
author |
Yoshida, K Seger, A Kennedy, F McMinn, A Suzuki, K |
author_facet |
Yoshida, K Seger, A Kennedy, F McMinn, A Suzuki, K |
author_sort |
Yoshida, K |
title |
Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
title_short |
Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
title_full |
Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
title_fullStr |
Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
title_full_unstemmed |
Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank |
title_sort |
freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom fragilariopsis cylindrus (bacillariophyceae) using an ice tank |
publisher |
Blackwell Publishing Inc |
publishDate |
2020 |
url |
https://doi.org/10.1111/jpy.13036 http://www.ncbi.nlm.nih.gov/pubmed/32464687 http://ecite.utas.edu.au/140793 |
genre |
ice algae Sea ice |
genre_facet |
ice algae Sea ice |
op_relation |
http://dx.doi.org/10.1111/jpy.13036 Yoshida, K and Seger, A and Kennedy, F and McMinn, A and Suzuki, K, Freezing, melting, and light stress on the photophysiology of ice algae: ex situ incubation of the ice algal diatom Fragilariopsis cylindrus (Bacillariophyceae) using an ice tank, Journal of Phycology, 56, (5) pp. 1323-1338. ISSN 0022-3646 (2020) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/32464687 http://ecite.utas.edu.au/140793 |
op_doi |
https://doi.org/10.1111/jpy.13036 |
container_title |
Journal of Phycology |
container_volume |
56 |
container_issue |
5 |
container_start_page |
1323 |
op_container_end_page |
1338 |
_version_ |
1766026881297022976 |