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RESEARCH ARTICLE
Contents Vol 37(11)

Examination of pre-industrial and future [CO2] reveals the temperature-dependent CO2 sensitivity of light energy partitioning at PSII in eucalypts

Barry A. Logan A E , Carolyn R. Hricko A , James D. Lewis B C , Oula Ghannoum C , Nathan G. Phillips C D , Renee Smith C , Jann P. Conroy C and David T. Tissue C
+ Author Affiliations
- Author Affiliations

A Department of Biology, Bowdoin College, Brunswick, ME 04011, USA.

B Department of Biological Sciences, Fordham University, Bronx, NY 10458, USA.

C Centre for Plants and the Environment, University of Western Sydney, Richmond, NSW 2753, Australia.

D Department of Geography and Environment, Boston University, Boston, MA 02215, USA.

E Corresponding author. Email: blogan@bowdoin.edu

Functional Plant Biology 37(11) 1041-1049 https://doi.org/10.1071/FP10113
Submitted: 14 May 2010  Accepted: 18 July 2010   Published: 22 October 2010

Abstract

We grew faster-growing Eucalyptus saligna Sm. and slower-growing Eucalyptus sideroxylon A. Cunn ex Woolls tree seedlings in sunlit glasshouses at all combinations of 290 µL L–1 (pre-industrial), 400 µL L–1 (modern) or 650 µL L–1 (future) global atmospheric CO2 ([CO2]), and ambient or ambient + 4°C temperature. To assess photosynthetic performance, we simultaneously measured light-saturated CO2 assimilation (Asat) and chlorophyll fluorescence emission along with the capacity for photosynthetic O2 evolution and leaf pigment composition. Photosynthetic response to [CO2] was similar between species. Increasing [CO2] but not temperature increased Asat. The response of photosynthetic electron transport to [CO2] was temperature-dependent and manifested through adjustments in energy partitioning at PSII. Increasing [CO2] resulted in greater PSII operating efficiencies at the elevated temperature. We observed no associated acclimatory adjustments in the capacity for photosynthetic O2 evolution or changes in leaf chlorophyll content. Photoprotective energy dissipation responded to increasing [CO2] and temperature. Across species and treatments, increased energy partitioning to electron transport was always associated with decreased partitioning to energy dissipation. Our results suggest that in response to increasing [CO2] and temperature, E. saligna and E. sideroxylon meet increased demands for the products of electron transport via adjustments in energy partitioning, not through acclimation of the capacity for photosynthetic electron transport or light absorption.

Additional keywords: chlorophyll fluorescence, climate change, energy dissipation, O2 evolution, photoprotection, sub-ambient and elevated CO2.


Acknowledgements

Supported by Discovery Project Number DP0879531 of the Australian Research Council to DT, JC, NP and BL; University of Western Sydney International Research Schemes Initiatives (IRIS) (71827 and 71846) to NP and JL; University of Western Sydney Eminent Researcher Scheme (80719) to BL; the United States National Science Foundation, Division of Integrative Organismal Systems (0517521); United States Department of Agriculture award no. MER-2002–04818; sabbatical support from Boston University to NP and from Fordham University to JL; and Roberts Fund support to CH.


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