Photokinetic adaptation of sea-ice algae
Progress Code: completed Statement: Taken from the 2005-2006 Progress Report: This objective will be met by addressing the following questions: 1) How does light and temperature stress interact in relation with the photosynthesis of sea-ice algae? - Do all species partition photon energy in a simila...
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ftands:oai:ands.org.au::2822358 2023-12-03T10:13:35+01:00 Photokinetic adaptation of sea-ice algae Spatial: westlimit=76; southlimit=-68.0; eastlimit=147; northlimit=-43.0 Temporal: From 2005-10-15 to 2005-11-25 https://researchdata.edu.au/photokinetic-adaptation-sea-ice-algae/2822358 unknown Australian Ocean Data Network https://researchdata.edu.au/photokinetic-adaptation-sea-ice-algae/2822358 ASAC_2702 Dataset DOI AU/AADC > Australian Antarctic Data Centre, Australia biota environment oceans EARTH SCIENCE > CRYOSPHERE > SEA ICE OCEANS > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS sea ice algae productivity FLUOROMETERS SHIPS LABORATORY R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR dataset ftands 2023-11-06T23:53:30Z Progress Code: completed Statement: Taken from the 2005-2006 Progress Report: This objective will be met by addressing the following questions: 1) How does light and temperature stress interact in relation with the photosynthesis of sea-ice algae? - Do all species partition photon energy in a similar way between photochemical quenching (qP) and non-photochemical quenching (qN) when exposed to light and temperature stress? 2) Does low temperature exacerbate light stress in sea-ice algae? - Do changes in temperature of these cryophilic cells cause the photosystems to alter their efficiency and therefore become photoinhibited? - Does the composition and organisation of PSII apparatus change with cold acclimation? 3) How do sea-ice algae use energy dissipation pathways to protect themselves? - Do sea-ice algae use non-photochemical quenching as a permanent energy dissipation mechanism, as opposed to a dynamic photoprotective mechanism? - Does light and/or temperature stress correlate with particular components of non-photochemical quenching processes (qE/qT/qI)? - Does state-transition quenching increase at lower temperatures? 4) Do sea ice algae use alternate protective mechanisms, apart from qN? - How important is PSI cyclic electron transport (Mehler) and photorespiration in low temperature stress? Approach: Experiment 1: Partitioning of quenching under light/temperature manipulations Photosynthesis of sea-ice algae is strongly influenced by light and temperature (Rochet et al 1985; Palmisano et al 1987). At low temperatures the photosynthetic apparatus (enzyme systems) functions slowly, so light can easily damage the photosystems due to the formation of free radicals. All plants attempt to achieve photostasis, where incoming photon energy is carefully balanced between maximising photosynthesis, without allowing excess energy to cause damage to the photosystems. As such, energy absorbed from irradiance can be used in photosynthesis (photochemical quenching, qP) or protectively dissipated as excess heat ... Dataset Antarc* Antarctica aurora australis ice algae Sea ice Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean Psi ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
biota environment oceans EARTH SCIENCE > CRYOSPHERE > SEA ICE OCEANS > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS sea ice algae productivity FLUOROMETERS SHIPS LABORATORY R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
spellingShingle |
biota environment oceans EARTH SCIENCE > CRYOSPHERE > SEA ICE OCEANS > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS sea ice algae productivity FLUOROMETERS SHIPS LABORATORY R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR Photokinetic adaptation of sea-ice algae |
topic_facet |
biota environment oceans EARTH SCIENCE > CRYOSPHERE > SEA ICE OCEANS > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS sea ice algae productivity FLUOROMETERS SHIPS LABORATORY R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
description |
Progress Code: completed Statement: Taken from the 2005-2006 Progress Report: This objective will be met by addressing the following questions: 1) How does light and temperature stress interact in relation with the photosynthesis of sea-ice algae? - Do all species partition photon energy in a similar way between photochemical quenching (qP) and non-photochemical quenching (qN) when exposed to light and temperature stress? 2) Does low temperature exacerbate light stress in sea-ice algae? - Do changes in temperature of these cryophilic cells cause the photosystems to alter their efficiency and therefore become photoinhibited? - Does the composition and organisation of PSII apparatus change with cold acclimation? 3) How do sea-ice algae use energy dissipation pathways to protect themselves? - Do sea-ice algae use non-photochemical quenching as a permanent energy dissipation mechanism, as opposed to a dynamic photoprotective mechanism? - Does light and/or temperature stress correlate with particular components of non-photochemical quenching processes (qE/qT/qI)? - Does state-transition quenching increase at lower temperatures? 4) Do sea ice algae use alternate protective mechanisms, apart from qN? - How important is PSI cyclic electron transport (Mehler) and photorespiration in low temperature stress? Approach: Experiment 1: Partitioning of quenching under light/temperature manipulations Photosynthesis of sea-ice algae is strongly influenced by light and temperature (Rochet et al 1985; Palmisano et al 1987). At low temperatures the photosynthetic apparatus (enzyme systems) functions slowly, so light can easily damage the photosystems due to the formation of free radicals. All plants attempt to achieve photostasis, where incoming photon energy is carefully balanced between maximising photosynthesis, without allowing excess energy to cause damage to the photosystems. As such, energy absorbed from irradiance can be used in photosynthesis (photochemical quenching, qP) or protectively dissipated as excess heat ... |
format |
Dataset |
title |
Photokinetic adaptation of sea-ice algae |
title_short |
Photokinetic adaptation of sea-ice algae |
title_full |
Photokinetic adaptation of sea-ice algae |
title_fullStr |
Photokinetic adaptation of sea-ice algae |
title_full_unstemmed |
Photokinetic adaptation of sea-ice algae |
title_sort |
photokinetic adaptation of sea-ice algae |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/photokinetic-adaptation-sea-ice-algae/2822358 |
op_coverage |
Spatial: westlimit=76; southlimit=-68.0; eastlimit=147; northlimit=-43.0 Temporal: From 2005-10-15 to 2005-11-25 |
long_lat |
ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
geographic |
Southern Ocean Psi |
geographic_facet |
Southern Ocean Psi |
genre |
Antarc* Antarctica aurora australis ice algae Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica aurora australis ice algae Sea ice Southern Ocean |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/photokinetic-adaptation-sea-ice-algae/2822358 ASAC_2702 Dataset DOI |
_version_ |
1784260400144973824 |