Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island
Understanding the response of sub-Antarctic plants to a warming climate requires an understanding of the relationship of carbon gain and loss to temperature. In a field study on Heard Island, we investigated the responses of photosynthesis and respiration of the sub-Antarctic megaherb Pringlea antis...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/69916 2023-05-15T13:56:44+02:00 Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island Schortemeyer, Marcus Evans, John Bruhn, Dan Bergstrom, Dana M Ball, Marilyn 2015-12-10T23:35:35Z http://hdl.handle.net/1885/69916 unknown CSIRO Publishing 1445-4408 http://hdl.handle.net/1885/69916 Functional Plant Biology Journal article 2015 ftanucanberra 2015-12-21T23:45:50Z Understanding the response of sub-Antarctic plants to a warming climate requires an understanding of the relationship of carbon gain and loss to temperature. In a field study on Heard Island, we investigated the responses of photosynthesis and respiration of the sub-Antarctic megaherb Pringlea antiscorbutica R. Br. to temperature. This was done by instantaneously manipulating leaf temperature in a gas exchange cuvette on plants adapted to natural temperature variation along an altitudinal gradient. There was little altitudinal variation in the temperature response of photosynthesis. Photosynthesis was much less responsive to temperature than electron transport, suggesting that Rubisco activity was generally the rate-limiting process. The temperature response of leaf respiration rates was greater in cold-grown (high altitude) plants compared with warm-grown (low altitude) plants. This thermal acclimation would enable plants to maintain a positive carbon budget over a greater temperature range. Article in Journal/Newspaper Antarc* Antarctic Heard Island Australian National University: ANU Digital Collections Antarctic Heard Island |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
Understanding the response of sub-Antarctic plants to a warming climate requires an understanding of the relationship of carbon gain and loss to temperature. In a field study on Heard Island, we investigated the responses of photosynthesis and respiration of the sub-Antarctic megaherb Pringlea antiscorbutica R. Br. to temperature. This was done by instantaneously manipulating leaf temperature in a gas exchange cuvette on plants adapted to natural temperature variation along an altitudinal gradient. There was little altitudinal variation in the temperature response of photosynthesis. Photosynthesis was much less responsive to temperature than electron transport, suggesting that Rubisco activity was generally the rate-limiting process. The temperature response of leaf respiration rates was greater in cold-grown (high altitude) plants compared with warm-grown (low altitude) plants. This thermal acclimation would enable plants to maintain a positive carbon budget over a greater temperature range. |
format |
Article in Journal/Newspaper |
author |
Schortemeyer, Marcus Evans, John Bruhn, Dan Bergstrom, Dana M Ball, Marilyn |
spellingShingle |
Schortemeyer, Marcus Evans, John Bruhn, Dan Bergstrom, Dana M Ball, Marilyn Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
author_facet |
Schortemeyer, Marcus Evans, John Bruhn, Dan Bergstrom, Dana M Ball, Marilyn |
author_sort |
Schortemeyer, Marcus |
title |
Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
title_short |
Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
title_full |
Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
title_fullStr |
Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
title_full_unstemmed |
Temperature responses of photosynthesis and respiration in a sub-Antarctic megaherb from Heard Island |
title_sort |
temperature responses of photosynthesis and respiration in a sub-antarctic megaherb from heard island |
publisher |
CSIRO Publishing |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/69916 |
geographic |
Antarctic Heard Island |
geographic_facet |
Antarctic Heard Island |
genre |
Antarc* Antarctic Heard Island |
genre_facet |
Antarc* Antarctic Heard Island |
op_source |
Functional Plant Biology |
op_relation |
1445-4408 http://hdl.handle.net/1885/69916 |
_version_ |
1766264314944028672 |