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Tiwari R, Gloor E, da Cruz WJA, Schwantes Marimon B, Marimon-Junior BH, Reis SM, de Souza IA, Krause HG, Slot M, Winter K, Ashley D, Béu RG, Borges CS, Da Cunha M, Fauset S, Ferreira LDS, Gonçalves MDA, Lopes TT, Marques EQ, Mendonça NG, Mendonça NG, Noleto PT, de Oliveira CHL, Oliveira MA, Pireda S, Dos Santos Prestes NCC, Santos DM, Santos EB, da Silva ELS, de Souza IA, de Souza LJ, Vitória AP, Foyer CH, Galbraith D. Photosynthetic quantum efficiency in south-eastern Amazonian trees may be already affected by climate change. Plant Cell Environ 2021; 44:2428-2439. [PMID: 32339294 DOI: 10.1111/pce.13770] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 03/28/2020] [Indexed: 06/11/2023]
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 (Fv /Fm ) of photosystem II was measured in seven dominant tree species using leaf discs exposed to varying levels of heat stress. T50 was calculated as the temperature at which Fv /Fm was half the maximum value. T5 is defined as the breakpoint temperature, at which Fv /Fm decline was initiated. Leaf thermotolerance in the rapidly warming southern Amazonia was the highest recorded for forest tree species globally. T50 and T5 varied between species, with one mid-storey species, Amaioua guianensis, exhibiting particularly high T50 and T5 values. While the T50 values of the species sampled were several degrees above the maximum air temperatures experienced in southern Amazonia, the T5 values of several species are now exceeded under present-day maximum air temperatures.
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Affiliation(s)
| | | | | | | | - Ben Hur Marimon-Junior
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Simone M Reis
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Igor Araújo de Souza
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Heinrich G Krause
- Smithsonian Tropical Research Institute, Panama City, Panama
- Institute of Plant Biochemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Martijn Slot
- Smithsonian Tropical Research Institute, Panama City, Panama
| | - Klaus Winter
- Smithsonian Tropical Research Institute, Panama City, Panama
| | - David Ashley
- School of Geography, University of Leeds, Leeds, UK
| | - Raiane G Béu
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Camila S Borges
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Maura Da Cunha
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos Dos Goytacazes, Brazil
| | - Sophie Fauset
- Faculty of Science and Engineering, School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, UK
| | - Laura D S Ferreira
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | | | - Thaynara T Lopes
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Eduardo Q Marques
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Natalia G Mendonça
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Natana G Mendonça
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Pedro T Noleto
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | | | - Milene A Oliveira
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Saulo Pireda
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos Dos Goytacazes, Brazil
| | | | - Denilson M Santos
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Eduarda B Santos
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | | | - Izabel A de Souza
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Luciana J de Souza
- Universidade do Estado de Mato Grosso, Laboratório de Ecologia Vegetal, Nova Xavantina, Brazil
| | - Angela P Vitória
- Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos Dos Goytacazes, Brazil
| | - Christine H Foyer
- Faculty of Biological Sciences, University of Leeds, Leeds, UK
- School of Biosciences, University of Birmingham, Birmingham, UK
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