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Photoacclimation by Arctic cryoconite phototrophs

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Photoacclimation by Arctic cryoconite phototrophs. / Perkins, Rupert G; Bagshaw, Elizabeth; Mol, Lisa; Williamson, Christopher J; Fagan, Dan T; Gamble, Maggie L; Yallop, Marian L.

In: FEMS Microbiology Ecology, Vol. 93, No. 5, fix018, 05.2017.

Research output: Contribution to journalArticle

Harvard

Perkins, RG, Bagshaw, E, Mol, L, Williamson, CJ, Fagan, DT, Gamble, ML & Yallop, ML 2017, 'Photoacclimation by Arctic cryoconite phototrophs', FEMS Microbiology Ecology, vol. 93, no. 5, fix018. https://doi.org/10.1093/femsec/fix018

APA

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, 93(5), [fix018]. https://doi.org/10.1093/femsec/fix018

Vancouver

Perkins RG, Bagshaw E, Mol L, Williamson CJ, Fagan DT, Gamble ML et al. Photoacclimation by Arctic cryoconite phototrophs. FEMS Microbiology Ecology. 2017 May;93(5). fix018. https://doi.org/10.1093/femsec/fix018

Author

Perkins, Rupert G ; Bagshaw, Elizabeth ; Mol, Lisa ; Williamson, Christopher J ; Fagan, Dan T ; Gamble, Maggie L ; Yallop, Marian L. / Photoacclimation by Arctic cryoconite phototrophs. In: FEMS Microbiology Ecology. 2017 ; Vol. 93, No. 5.

Bibtex

@article{d71df0a5b3334648a06b16d43ec51b6e,
title = "Photoacclimation by Arctic cryoconite phototrophs",
abstract = "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.",
keywords = "cryoconite, photoacclimation, downregulation, non-photochemical quenching, productivity, fluorescence",
author = "Perkins, {Rupert G} and Elizabeth Bagshaw and Lisa Mol and Williamson, {Christopher J} and Fagan, {Dan T} and Gamble, {Maggie L} and Yallop, {Marian L}",
year = "2017",
month = "5",
doi = "10.1093/femsec/fix018",
language = "English",
volume = "93",
journal = "FEMS Microbiology Ecology",
issn = "0168-6496",
publisher = "Oxford University Press",
number = "5",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Photoacclimation by Arctic cryoconite phototrophs

AU - Perkins, Rupert G

AU - Bagshaw, Elizabeth

AU - Mol, Lisa

AU - Williamson, Christopher J

AU - Fagan, Dan T

AU - Gamble, Maggie L

AU - Yallop, Marian L

PY - 2017/5

Y1 - 2017/5

N2 - 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.

AB - 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.

KW - cryoconite

KW - photoacclimation

KW - downregulation

KW - non-photochemical quenching

KW - productivity

KW - fluorescence

U2 - 10.1093/femsec/fix018

DO - 10.1093/femsec/fix018

M3 - Article

C2 - 28334248

VL - 93

JO - FEMS Microbiology Ecology

JF - FEMS Microbiology Ecology

SN - 0168-6496

IS - 5

M1 - fix018

ER -