Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica
Effects of high irradiance and moderate heat on photosynthesis of the tree-fern Dicksonia antarctica (Labill., Dicksoniaceae) were examined in a climate chamber under two contrasting irradiance regimes (900 and 170 µmol photons m-2 s-1) and three sequential temperature treatments (15°C; 35°C; back t...
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ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/258598 2024-06-02T07:58:42+00:00 Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica Volkova, L Tausz, M Bennett, LT Dreyer, E 2009 http://hdl.handle.net/11343/258598 English eng CSIRO PUBLISHING issn:1445-4408 doi:10.1071/FP09098 pii: FP09098 Volkova, L., Tausz, M., Bennett, L. T. & Dreyer, E. (2009). Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica . FUNCTIONAL PLANT BIOLOGY, 36 (12), pp.1046-1056. https://doi.org/10.1071/FP09098. 1445-4416 http://hdl.handle.net/11343/258598 Journal Article 2009 ftumelbourne https://doi.org/10.1071/FP09098 2024-05-06T12:00:06Z Effects of high irradiance and moderate heat on photosynthesis of the tree-fern Dicksonia antarctica (Labill., Dicksoniaceae) were examined in a climate chamber under two contrasting irradiance regimes (900 and 170 µmol photons m-2 s-1) and three sequential temperature treatments (15°C; 35°C; back to 15°C). High irradiance led to decline in predawn quantum yield of photochemistry, Fv/Fm (0.73), maximal Rubisco activity (Vcmax; from 37 to 29 µmol m-2s-1), and electron transport capacity (Jmax; from 115 to 67 µmol m-2 s-1). Temperature increase to 35°C resulted in further decreases in Fv/Fm (0.45) and in chlorophyll bleaching of high irradiance plants, while Vcmax and Jmax were not affected. Critical temperature for thylakoid stability (Tc) of D. antarctica was comparable with other higher plants (c. 47°C), and increases of Tc with air temperature were greater in high irradiance plants. Increased Tc was not associated with accumulation of osmotica or zeaxanthin formation. High irradiance increased the xanthophyll cycle pigment pool (V+A+Z, 91 v. 48 mmol mol-1 chlorophyll-1), de-epoxidation state (56% v. 4%), and α-tocopherol. Temperature increase to 35°C had no effect on V+A+Z and de-epoxidation state in both light regimes, while lutein, β-carotene and α-tocopherols increased, potentially contributing to increased membrane stability under high irradiance. Article in Journal/Newspaper Antarc* Antarctica The University of Melbourne: Digital Repository Functional Plant Biology 36 12 1046 |
institution |
Open Polar |
collection |
The University of Melbourne: Digital Repository |
op_collection_id |
ftumelbourne |
language |
English |
description |
Effects of high irradiance and moderate heat on photosynthesis of the tree-fern Dicksonia antarctica (Labill., Dicksoniaceae) were examined in a climate chamber under two contrasting irradiance regimes (900 and 170 µmol photons m-2 s-1) and three sequential temperature treatments (15°C; 35°C; back to 15°C). High irradiance led to decline in predawn quantum yield of photochemistry, Fv/Fm (0.73), maximal Rubisco activity (Vcmax; from 37 to 29 µmol m-2s-1), and electron transport capacity (Jmax; from 115 to 67 µmol m-2 s-1). Temperature increase to 35°C resulted in further decreases in Fv/Fm (0.45) and in chlorophyll bleaching of high irradiance plants, while Vcmax and Jmax were not affected. Critical temperature for thylakoid stability (Tc) of D. antarctica was comparable with other higher plants (c. 47°C), and increases of Tc with air temperature were greater in high irradiance plants. Increased Tc was not associated with accumulation of osmotica or zeaxanthin formation. High irradiance increased the xanthophyll cycle pigment pool (V+A+Z, 91 v. 48 mmol mol-1 chlorophyll-1), de-epoxidation state (56% v. 4%), and α-tocopherol. Temperature increase to 35°C had no effect on V+A+Z and de-epoxidation state in both light regimes, while lutein, β-carotene and α-tocopherols increased, potentially contributing to increased membrane stability under high irradiance. |
format |
Article in Journal/Newspaper |
author |
Volkova, L Tausz, M Bennett, LT Dreyer, E |
spellingShingle |
Volkova, L Tausz, M Bennett, LT Dreyer, E Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
author_facet |
Volkova, L Tausz, M Bennett, LT Dreyer, E |
author_sort |
Volkova, L |
title |
Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
title_short |
Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
title_full |
Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
title_fullStr |
Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
title_full_unstemmed |
Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica |
title_sort |
interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern dicksonia antarctica |
publisher |
CSIRO PUBLISHING |
publishDate |
2009 |
url |
http://hdl.handle.net/11343/258598 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
issn:1445-4408 doi:10.1071/FP09098 pii: FP09098 Volkova, L., Tausz, M., Bennett, L. T. & Dreyer, E. (2009). Interactive effects of high irradiance and moderate heat on photosynthesis, pigments, and tocopherol in the tree-fern Dicksonia antarctica . FUNCTIONAL PLANT BIOLOGY, 36 (12), pp.1046-1056. https://doi.org/10.1071/FP09098. 1445-4416 http://hdl.handle.net/11343/258598 |
op_doi |
https://doi.org/10.1071/FP09098 |
container_title |
Functional Plant Biology |
container_volume |
36 |
container_issue |
12 |
container_start_page |
1046 |
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1800742209260093440 |