Photoacclimation by Arctic cryoconite phototrophs
Cryoconite is a matrix of sediment, biogenic polymer and a microbial community that resides on glacier surfaces. The phototrophic component of this community is well adapted to this extreme environment, including high light stress. Photoacclimation of the cryoconite phototrophic community on Longyea...
Published in: | FEMS Microbiology Ecology |
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Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://hdl.handle.net/1983/d71df0a5-b333-4648-a06b-16d43ec51b6e https://research-information.bris.ac.uk/en/publications/d71df0a5-b333-4648-a06b-16d43ec51b6e https://doi.org/10.1093/femsec/fix018 https://research-information.bris.ac.uk/ws/files/114808719/Perkins_et_al_Cryoconite_Photoacclimation_FEMS_2017.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/d71df0a5-b333-4648-a06b-16d43ec51b6e 2024-01-28T10:02:06+01:00 Photoacclimation by Arctic cryoconite phototrophs Perkins, Rupert G Bagshaw, Elizabeth Mol, Lisa Williamson, Christopher J Fagan, Dan T Gamble, Maggie L Yallop, Marian L 2017-05 application/pdf https://hdl.handle.net/1983/d71df0a5-b333-4648-a06b-16d43ec51b6e https://research-information.bris.ac.uk/en/publications/d71df0a5-b333-4648-a06b-16d43ec51b6e https://doi.org/10.1093/femsec/fix018 https://research-information.bris.ac.uk/ws/files/114808719/Perkins_et_al_Cryoconite_Photoacclimation_FEMS_2017.pdf eng eng info:eu-repo/semantics/openAccess Perkins , R G , Bagshaw , E , Mol , L , Williamson , C J , Fagan , D T , Gamble , M L & Yallop , M L 2017 , ' Photoacclimation by Arctic cryoconite phototrophs ' , FEMS Microbiology Ecology , vol. 93 , no. 5 , fix018 . https://doi.org/10.1093/femsec/fix018 cryoconite photoacclimation downregulation non-photochemical quenching productivity fluorescence article 2017 ftubristolcris https://doi.org/10.1093/femsec/fix018 2024-01-04T23:52:41Z Cryoconite is a matrix of sediment, biogenic polymer and a microbial community that resides on glacier surfaces. The phototrophic component of this community is well adapted to this extreme environment, including high light stress. Photoacclimation of the cryoconite phototrophic community on Longyearbreen, Svalbard, was investigated using in situ variable chlorophyll fluorescence. Rapid light curves (RLCs) and induction–recovery curves were used to analyse photosystem II quantum efficiency, relative electron transport rate and forms of downregulation including non-photochemical quenching (NPQ) and state transitions in cyanobacteria. Phototrophs used a combination of behavioural and physiological photochemical downregulation. Behavioural downregulation is hypothesised to incorporate chloroplast movement and cell or filament positioning within the sediment matrix in order to shade from high light, which resulted in a lack of saturation of RLCs and hence overestimation of productivity. Physiological downregulation likely consisted of biphasic NPQ, comprising a steadily induced light-dependent form and a light-independent NPQ that was not reversed with decreasing light intensity. State transitions by cyanobacteria were the most likely physiological downregulation employed by cyanobacteria within the mixed phototroph community. These findings demonstrate that cryoconite phototrophs combine multiple forms of physiological and behavioural downregulation to optimise light exposure and maximise photosynthetic productivity. This plasticity of photoacclimation enables them to survive productively in the high-light stress environment on the ice surface. Article in Journal/Newspaper Arctic Arctic glacier Longyearbreen Svalbard University of Bristol: Bristol Research Arctic Longyearbreen ENVELOPE(15.517,15.517,78.183,78.183) Svalbard FEMS Microbiology Ecology 93 5 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
cryoconite photoacclimation downregulation non-photochemical quenching productivity fluorescence |
spellingShingle |
cryoconite photoacclimation downregulation non-photochemical quenching productivity fluorescence Perkins, Rupert G Bagshaw, Elizabeth Mol, Lisa Williamson, Christopher J Fagan, Dan T Gamble, Maggie L Yallop, Marian L Photoacclimation by Arctic cryoconite phototrophs |
topic_facet |
cryoconite photoacclimation downregulation non-photochemical quenching productivity fluorescence |
description |
Cryoconite is a matrix of sediment, biogenic polymer and a microbial community that resides on glacier surfaces. The phototrophic component of this community is well adapted to this extreme environment, including high light stress. Photoacclimation of the cryoconite phototrophic community on Longyearbreen, Svalbard, was investigated using in situ variable chlorophyll fluorescence. Rapid light curves (RLCs) and induction–recovery curves were used to analyse photosystem II quantum efficiency, relative electron transport rate and forms of downregulation including non-photochemical quenching (NPQ) and state transitions in cyanobacteria. Phototrophs used a combination of behavioural and physiological photochemical downregulation. Behavioural downregulation is hypothesised to incorporate chloroplast movement and cell or filament positioning within the sediment matrix in order to shade from high light, which resulted in a lack of saturation of RLCs and hence overestimation of productivity. Physiological downregulation likely consisted of biphasic NPQ, comprising a steadily induced light-dependent form and a light-independent NPQ that was not reversed with decreasing light intensity. State transitions by cyanobacteria were the most likely physiological downregulation employed by cyanobacteria within the mixed phototroph community. These findings demonstrate that cryoconite phototrophs combine multiple forms of physiological and behavioural downregulation to optimise light exposure and maximise photosynthetic productivity. This plasticity of photoacclimation enables them to survive productively in the high-light stress environment on the ice surface. |
format |
Article in Journal/Newspaper |
author |
Perkins, Rupert G Bagshaw, Elizabeth Mol, Lisa Williamson, Christopher J Fagan, Dan T Gamble, Maggie L Yallop, Marian L |
author_facet |
Perkins, Rupert G Bagshaw, Elizabeth Mol, Lisa Williamson, Christopher J Fagan, Dan T Gamble, Maggie L Yallop, Marian L |
author_sort |
Perkins, Rupert G |
title |
Photoacclimation by Arctic cryoconite phototrophs |
title_short |
Photoacclimation by Arctic cryoconite phototrophs |
title_full |
Photoacclimation by Arctic cryoconite phototrophs |
title_fullStr |
Photoacclimation by Arctic cryoconite phototrophs |
title_full_unstemmed |
Photoacclimation by Arctic cryoconite phototrophs |
title_sort |
photoacclimation by arctic cryoconite phototrophs |
publishDate |
2017 |
url |
https://hdl.handle.net/1983/d71df0a5-b333-4648-a06b-16d43ec51b6e https://research-information.bris.ac.uk/en/publications/d71df0a5-b333-4648-a06b-16d43ec51b6e https://doi.org/10.1093/femsec/fix018 https://research-information.bris.ac.uk/ws/files/114808719/Perkins_et_al_Cryoconite_Photoacclimation_FEMS_2017.pdf |
long_lat |
ENVELOPE(15.517,15.517,78.183,78.183) |
geographic |
Arctic Longyearbreen Svalbard |
geographic_facet |
Arctic Longyearbreen Svalbard |
genre |
Arctic Arctic glacier Longyearbreen Svalbard |
genre_facet |
Arctic Arctic glacier Longyearbreen Svalbard |
op_source |
Perkins , R G , Bagshaw , E , Mol , L , Williamson , C J , Fagan , D T , Gamble , M L & Yallop , M L 2017 , ' Photoacclimation by Arctic cryoconite phototrophs ' , FEMS Microbiology Ecology , vol. 93 , no. 5 , fix018 . https://doi.org/10.1093/femsec/fix018 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/femsec/fix018 |
container_title |
FEMS Microbiology Ecology |
container_volume |
93 |
container_issue |
5 |
_version_ |
1789327622950354944 |