Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale

Kumarathunge, Dushan P., Medlyn, Belinda E., Drake, John E., Tjoelker, Mark G., Aspinwall, Michael J., Battaglia, Michael, Cano, Francisco J., Carter, Kelsey R., Cavaleri, Molly A., Cernusak, Lucas A., Chambers, Jeffrey Q., Crous, Kristine Y., De Kauwe, Martin G., Dillaway, Dylan N., Dreyer, Erwin, Ellsworth, David S., Ghannoum, Oula, Han, Qingmin, Hikosaka, Kouki, Jensen, Anna M., Kelly, Jeff W.G., Kruger, Eric L., Mercado, Lina M., Onoda, Yusuke, Reich, Peter B., Rogers, Alistair, Slot, Martijn, Smith, Nicholas G., Tarvainen, Lasse, Tissue, David T., Togashi, Henrique F., Tribuzy, Edgard S., Uddling, Johan, Varhammar, Angelica, Wallin, Goeran, Warren, Jeffrey, and Way, Danielle A. (2019) Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale. New Phytologist, 222 (2). pp. 768-784.

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Abstract

The temperature response of photosynthesis is one of the key factors determining predicted responses to warming in global vegetation models (GVMs). The response may vary geographically, owing to genetic adaptation to climate, and temporally, as a result of acclimation to changes in ambient temperature. Our goal was to develop a robust quantitative global model representing acclimation and adaptation of photosynthetic temperature responses.

We quantified and modelled key mechanisms responsible for photosynthetic temperature acclimation and adaptation using a global dataset of photosynthetic CO2 response curves, including data from 141 C-3 species from tropical rainforest to Arctic tundra. We separated temperature acclimation and adaptation processes by considering seasonal and common-garden datasets, respectively.

The observed global variation in the temperature optimum of photosynthesis was primarily explained by biochemical limitations to photosynthesis, rather than stomatal conductance or respiration. We found acclimation to growth temperature to be a stronger driver of this variation than adaptation to temperature at climate of origin.

We developed a summary model to represent photosynthetic temperature responses and showed that it predicted the observed global variation in optimal temperatures with high accuracy. This novel algorithm should enable improved prediction of the function of global ecosystems in a warming climate.

Item ID: 58281
Item Type: Article (Research - C1)
ISSN: 1469-8137
Keywords: AC(i) curves, climate of origin, global vegetation models (GVMs), growth temperature, J(max), maximum carboxylation capacity, maximum electron transport rate, V-cmax
Funders: Western Sydney University (WUS), United States Department of Energy (DOE), Australian Research Council (ARC), Swedish Strategic Research, National Sciences and Engineering Research Council (NSERC), Brookhaven National Laboratory (BNL)
Projects and Grants: DOE-SC0012704, ARC DECRA DE160101484, ARC DP14013415, DOE DEAC05‐00OR22725, BNL DE-SC0012704
Date Deposited: 15 May 2019 07:43
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060705 Plant Physiology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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