Photosynthetic capacity in middle-aged larch and spruce acclimates independently to experimental warming and elevated CO 2 .

Autor: Dusenge ME; Department of Biology, Mount Allison University, Sackville, New Brunswick, Canada.; Department of Biology, The University of Western Ontario, London, Ontario, Canada., Warren JM; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA., Reich PB; Institute for Global Change Biology, and School for the Environment and Sustainability, University of Michigan, Ann Arbor, Michigan, USA.; Department of Forest Resources, University of Minnesota, Saint Paul, Minnesota, USA.; Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, New South Wales, Australia., Ward EJ; Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA., Murphy BK; Department of Biology, The University of Western Ontario, London, Ontario, Canada.; Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada.; Graduate Program in Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada., Stefanski A; Department of Forest Resources, University of Minnesota, Saint Paul, Minnesota, USA., Bermudez R; Department of Forest Resources, University of Minnesota, Saint Paul, Minnesota, USA., Cruz M; Departamento de Ciencias Biologicas, Universidad de Los Andes, Bogota, Colombia., McLennan DA; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA., King AW; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA., Montgomery RA; Department of Forest Resources, University of Minnesota, Saint Paul, Minnesota, USA., Hanson PJ; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA., Way DA; Department of Biology, The University of Western Ontario, London, Ontario, Canada.; Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, Australia.; Nicholas School of the Environment, Duke University, Durham, North Carolina, USA.; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York, USA.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2024 Aug 05. Date of Electronic Publication: 2024 Aug 05.
DOI: 10.1111/pce.15068
Abstrakt: 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.
(© 2024 The Author(s). Plant, Cell & Environment published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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