Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana
Effects of irradiance, temperature and water availability on respiration and photosynthesis in a maritime Antarctic liverwort, Marchantia berteroana, were investigated. Carbon dioxide exchange was measured using an infra-red gas analysis system under controlled conditions. The relationships between...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/514453/ https://doi.org/10.1007/s003000050125 |
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ftnerc:oai:nora.nerc.ac.uk:514453 2023-05-15T13:49:33+02:00 Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana Davey, Martin C. 1997-02 http://nora.nerc.ac.uk/id/eprint/514453/ https://doi.org/10.1007/s003000050125 unknown Springer Davey, Martin C. 1997 Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana. Polar Biology, 17 (3). 219-227. https://doi.org/10.1007/s003000050125 <https://doi.org/10.1007/s003000050125> Publication - Article PeerReviewed 1997 ftnerc https://doi.org/10.1007/s003000050125 2023-02-04T19:43:29Z Effects of irradiance, temperature and water availability on respiration and photosynthesis in a maritime Antarctic liverwort, Marchantia berteroana, were investigated. Carbon dioxide exchange was measured using an infra-red gas analysis system under controlled conditions. The relationships between respiration, photosynthesis, irradiance and temperature were modelled. Application of these models to year-round micro-climate data provided an estimate of yearly net productivity of 823 (SE=75) mg C⋅g-1 ash-free dry weight. year-1; this is somewhat higher than figures obtained for other Antarctic cryptogams. Desiccation had a highly adverse affect on Marchantia. Photosynthetic capacity was reduced below a water content of 12 g⋅g-1 afdw, and there was only a limited recovery (ca. 10%) after dehydration. Freezing also caused a great reduction in photosynthesis, although the model suggested that photosynthesis at sub-zero temperatures is likely. It is suggested that seasonality in the photosynthetic capacity and the survival of sub-zero temperatures might be important. It is concluded that Marchantia is a relatively productive Antarctic cryptogam that may dominate favourable areas, but that its low tolerance of environmental stress, particularly desiccation, limits its distribution to relatively mild habitats. Article in Journal/Newspaper Antarc* Antarctic Polar Biology Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Polar Biology 17 3 219 227 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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Effects of irradiance, temperature and water availability on respiration and photosynthesis in a maritime Antarctic liverwort, Marchantia berteroana, were investigated. Carbon dioxide exchange was measured using an infra-red gas analysis system under controlled conditions. The relationships between respiration, photosynthesis, irradiance and temperature were modelled. Application of these models to year-round micro-climate data provided an estimate of yearly net productivity of 823 (SE=75) mg C⋅g-1 ash-free dry weight. year-1; this is somewhat higher than figures obtained for other Antarctic cryptogams. Desiccation had a highly adverse affect on Marchantia. Photosynthetic capacity was reduced below a water content of 12 g⋅g-1 afdw, and there was only a limited recovery (ca. 10%) after dehydration. Freezing also caused a great reduction in photosynthesis, although the model suggested that photosynthesis at sub-zero temperatures is likely. It is suggested that seasonality in the photosynthetic capacity and the survival of sub-zero temperatures might be important. It is concluded that Marchantia is a relatively productive Antarctic cryptogam that may dominate favourable areas, but that its low tolerance of environmental stress, particularly desiccation, limits its distribution to relatively mild habitats. |
format |
Article in Journal/Newspaper |
author |
Davey, Martin C. |
spellingShingle |
Davey, Martin C. Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
author_facet |
Davey, Martin C. |
author_sort |
Davey, Martin C. |
title |
Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
title_short |
Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
title_full |
Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
title_fullStr |
Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
title_full_unstemmed |
Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana |
title_sort |
effects of physical factors on photosynthesis by the antarctic liverwort marchantia berteroana |
publisher |
Springer |
publishDate |
1997 |
url |
http://nora.nerc.ac.uk/id/eprint/514453/ https://doi.org/10.1007/s003000050125 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Polar Biology |
genre_facet |
Antarc* Antarctic Polar Biology |
op_relation |
Davey, Martin C. 1997 Effects of physical factors on photosynthesis by the Antarctic liverwort Marchantia berteroana. Polar Biology, 17 (3). 219-227. https://doi.org/10.1007/s003000050125 <https://doi.org/10.1007/s003000050125> |
op_doi |
https://doi.org/10.1007/s003000050125 |
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Polar Biology |
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17 |
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3 |
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219 |
op_container_end_page |
227 |
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1766251546149912576 |