Photosynthetic capacity in middle‐aged larch and spruce acclimates independently to experimental warming and elevated CO<sub>2</sub>

Abstract Photosynthetic acclimation to both warming and elevated CO 2 of boreal trees remains a key uncertainty in modelling the response of photosynthesis to future climates. We investigated the impact of increased growth temperature and elevated CO 2 on photosynthetic capacity ( V cmax and J max ) in mature trees of two North American boreal conifers, tamarack and black spruce. We show that V cmax and J max at a standard temperature of 25°C did not change with warming, while V cmax and J max at their thermal optima ( T opt ) and growth temperature ( T g ) increased. Moreover, V cmax and J max at either 25°C, T opt or T g decreased with elevated CO 2 . The J max / V cmax ratio decreased with warming when assessed at both T opt and T g but did not significantly vary at 25°C. The J max / V cmax increased with elevated CO 2 at either reference temperature. We found no significant interaction between warming and elevated CO 2 on all traits. If this lack of interaction between warming and elevated CO 2 on the V cmax , J max and J max / V cmax ratio is a general trend, it would have significant implications for improving photosynthesis representation in vegetation models. However, future research is required to investigate the widespread nature of this response in a larger number of species and biomes.

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Publication Details

Journal
Plant Cell & Environment
Published
2024-08-05
DOI
https://doi.org/10.1111/pce.15068
Citations
10
Primary Topic
Plant responses to elevated CO2
Type
article
Field-Weighted Citation Impact
6.00

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article

Photosynthetic capacity in middle‐aged larch and spruce acclimates independently to experimental warming and elevated CO2

Mirindi Eric Dusenge, Marisol Cruz, David McLennan, J. M. Warren et al.
10 citations
Plant Cell & Environment
Plant responses to elevated CO2
6.00
article

Photosynthetic capacity in middle‐aged larch and spruce acclimates independently to experimental warming and elevated CO2

Mirindi Eric Dusenge, Marisol Cruz, David McLennan, J. M. Warren, Eric J. Ward, Rebecca Montgomery, Artur Stefański, Peter B. Reich, Paul J. Hanson, Danielle A. Way, Bridget Murphy, Raimundo Bermúdez, A. W. King
article en
10 citations

Abstract

Abstract Photosynthetic acclimation to both warming and elevated CO 2 of boreal trees remains a key uncertainty in modelling the response of photosynthesis to future climates. We investigated the impact of increased growth temperature and elevated CO 2 on photosynthetic capacity ( V cmax and J max ) in mature trees of two North American boreal conifers, tamarack and black spruce. We show that V cmax and J max at a standard temperature of 25°C did not change with warming, while V cmax and J max at their thermal optima ( T opt ) and growth temperature ( T g ) increased. Moreover, V cmax and J max at either 25°C, T opt or T g decreased with elevated CO 2 . The J max / V cmax ratio decreased with warming when assessed at both T opt and T g but did not significantly vary at 25°C. The J max / V cmax increased with elevated CO 2 at either reference temperature. We found no significant interaction between warming and elevated CO 2 on all traits. If this lack of interaction between warming and elevated CO 2 on the V cmax , J max and J max / V cmax ratio is a general trend, it would have significant implications for improving photosynthesis representation in vegetation models. However, future research is required to investigate the widespread nature of this response in a larger number of species and biomes.

Plant Cell & EnvironmentVol. 47(12)
Australian National University (AU), Western University (CA), Oak Ridge National Laboratory (US), University of Minnesota (US), Minnesota Department of Natural Resources (US), Universidad de Los Andes (CO), Mount Allison University (CA), Duke University (US), University of Toronto (CA), Brookhaven National Laboratory (US), University of Michigan (US), Earth System Science Interdisciplinary Center (US), Western Sydney University (AU), University of Maryland, College Park (US)
National Science Foundation, U.S. Geological Survey, Natural Sciences and Engineering Research Council of Canada
Climate action
Openalex Percentile: Top 4%
Plant responses to elevated CO2
6.00
DOIOpen Access PDFOpenAlex
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