Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina
The net photosynthetic response matrix to four light levels combined with four temperatures and for a full range of thallus hydration has been defined for a Cladonia–woodland population of Cladonia rangiferina in midsummer and early winter. Maximum rates of net photosynthesis are generated between 1...
Published in: | Canadian Journal of Botany |
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Language: | English |
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Canadian Science Publishing
1980
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Online Access: | http://dx.doi.org/10.1139/b80-214 http://www.nrcresearchpress.com/doi/pdf/10.1139/b80-214 |
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crcansciencepubl:10.1139/b80-214 2024-05-12T08:02:30+00:00 Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina Tegler, B. Kershaw, K. A. 1980 http://dx.doi.org/10.1139/b80-214 http://www.nrcresearchpress.com/doi/pdf/10.1139/b80-214 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 58, issue 17, page 1851-1858 ISSN 0008-4026 Plant Science journal-article 1980 crcansciencepubl https://doi.org/10.1139/b80-214 2024-04-18T06:54:52Z The net photosynthetic response matrix to four light levels combined with four temperatures and for a full range of thallus hydration has been defined for a Cladonia–woodland population of Cladonia rangiferina in midsummer and early winter. Maximum rates of net photosynthesis are generated between 150 and 200% thallus water content by weight between 15 and 25 °C with low rates being generated at 5 and 35 °C. Light saturation occurs above 600 μE∙m −2 ∙s −1 . There is no evidence of acclimation of photosynthetic optima to temperature but with the onset of early winter there is a marked decrease of respiration rate. An examination of the sensitivity of Cladonia rangiferina in an air-dry state to heat stress shows a rapid decline of net photosynthesis under 45 °C daytime stress. Although 35 °C initially reduces the level of net photosynthesis to some extent, over a 3-week experimental period no further decline is observed. It is suggested that this population of Cladonia rangiferina, which is markedly restriced to a position under the shade of Ledum shrubs, is protected there from the otherwise excessive heat load which occurs on the open Cladonia stellaris surface and which typically reaches 40 °C under full radiation conditions in summer. Article in Journal/Newspaper Cladonia rangiferina Canadian Science Publishing Canadian Journal of Botany 58 17 1851 1858 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
topic |
Plant Science |
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Plant Science Tegler, B. Kershaw, K. A. Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
topic_facet |
Plant Science |
description |
The net photosynthetic response matrix to four light levels combined with four temperatures and for a full range of thallus hydration has been defined for a Cladonia–woodland population of Cladonia rangiferina in midsummer and early winter. Maximum rates of net photosynthesis are generated between 150 and 200% thallus water content by weight between 15 and 25 °C with low rates being generated at 5 and 35 °C. Light saturation occurs above 600 μE∙m −2 ∙s −1 . There is no evidence of acclimation of photosynthetic optima to temperature but with the onset of early winter there is a marked decrease of respiration rate. An examination of the sensitivity of Cladonia rangiferina in an air-dry state to heat stress shows a rapid decline of net photosynthesis under 45 °C daytime stress. Although 35 °C initially reduces the level of net photosynthesis to some extent, over a 3-week experimental period no further decline is observed. It is suggested that this population of Cladonia rangiferina, which is markedly restriced to a position under the shade of Ledum shrubs, is protected there from the otherwise excessive heat load which occurs on the open Cladonia stellaris surface and which typically reaches 40 °C under full radiation conditions in summer. |
format |
Article in Journal/Newspaper |
author |
Tegler, B. Kershaw, K. A. |
author_facet |
Tegler, B. Kershaw, K. A. |
author_sort |
Tegler, B. |
title |
Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
title_short |
Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
title_full |
Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
title_fullStr |
Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
title_full_unstemmed |
Studies on lichen-dominated systems. XXIII. The control of seasonal rates of net photosynthesis by moisture, light, and temperature in Cladonia rangiferina |
title_sort |
studies on lichen-dominated systems. xxiii. the control of seasonal rates of net photosynthesis by moisture, light, and temperature in cladonia rangiferina |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/b80-214 http://www.nrcresearchpress.com/doi/pdf/10.1139/b80-214 |
genre |
Cladonia rangiferina |
genre_facet |
Cladonia rangiferina |
op_source |
Canadian Journal of Botany volume 58, issue 17, page 1851-1858 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b80-214 |
container_title |
Canadian Journal of Botany |
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58 |
container_issue |
17 |
container_start_page |
1851 |
op_container_end_page |
1858 |
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1798844603645820928 |