Tiwari, R, Gloor, E orcid.org/0000-0002-9384-6341, Da Cruz, WJA et al. (31 more authors) (2020) Photosynthetic quantum efficiency in south‐eastern Amazonian trees may be already affected by climate change. Plant, Cell and Environment. ISSN 0140-7791
Abstract
Tropical forests are experiencing unprecedented high‐temperature conditions due to climate change that could limit their photosynthetic functions. We studied the high‐temperature sensitivity of photosynthesis in a rainforest site in southern Amazonia, where some of the highest temperatures and most rapid warming in the Tropics have been recorded. The quantum yield (F v /F m ) of photosystem II was measured in seven dominant tree species using leaf discs exposed to varying levels of heat stress. T 50 was calculated as the temperature at which F v /F m was half the maximum value. T 5 is defined as the breakpoint temperature, at which F v /F m decline was initiated. Leaf thermotolerance in the rapidly warming southern Amazonia was the highest recorded for forest tree species globally. T 50 and T 5 varied between species, with one mid‐storey species, Amaioua guianensis , exhibiting particularly high T 50 and T 5 values. While the T 50 values of the species sampled were several degrees above the maximum air temperatures experienced in southern Amazonia, the T 5 values of several species are now exceeded under present‐day maximum air temperatures.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | Amazon forest; high‐temperature tolerance; photosynthesis; PSII maximum quantum yield; tropical evergreen trees |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biology (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Ecology & Global Change (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 May 2020 13:55 |
Last Modified: | 25 Jun 2023 22:17 |
Status: | Published online |
Publisher: | Wiley |
Identification Number: | 10.1111/pce.13770 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:161253 |