Seasonal acclimation of leaf respiration in Eucalyptus saligna trees: impacts of elevated atmospheric CO2 and summer drought
KRISTINE Y. CROUS
Division of Plant Sciences, Research School of Biology, Building 46, The Australian National University, Canberra, ACT 0200, Australia
Search for more papers by this authorJOANA ZARAGOZA-CASTELLS
School of Geosciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK
Search for more papers by this authorMARKUS LÖW
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorDAVID S. ELLSWORTH
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorDAVID T. TISSUE
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorMARK G. TJOELKER
Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas, USA
Search for more papers by this authorCRAIG V. M. BARTON
Forest Science Centre, Industry and Investment NSW, PO Box 100, Beecroft, NSW 2119, Australia
Search for more papers by this authorTERESA E. GIMENO
Laboratorio Internacional de Cambio Global (LINC-Global), Instituto de Recursos Naturales, CCMA, CSIC, Serrano 115, 28006 Madrid, Spain
Search for more papers by this authorOWEN K. ATKIN
Division of Plant Sciences, Research School of Biology, Building 46, The Australian National University, Canberra, ACT 0200, Australia
Search for more papers by this authorKRISTINE Y. CROUS
Division of Plant Sciences, Research School of Biology, Building 46, The Australian National University, Canberra, ACT 0200, Australia
Search for more papers by this authorJOANA ZARAGOZA-CASTELLS
School of Geosciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK
Search for more papers by this authorMARKUS LÖW
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorDAVID S. ELLSWORTH
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorDAVID T. TISSUE
Centre for Plants and the Environment, University of Western Sydney (Hawkesbury Campus), Penrith South DC, NSW 1797, Australia
Search for more papers by this authorMARK G. TJOELKER
Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas, USA
Search for more papers by this authorCRAIG V. M. BARTON
Forest Science Centre, Industry and Investment NSW, PO Box 100, Beecroft, NSW 2119, Australia
Search for more papers by this authorTERESA E. GIMENO
Laboratorio Internacional de Cambio Global (LINC-Global), Instituto de Recursos Naturales, CCMA, CSIC, Serrano 115, 28006 Madrid, Spain
Search for more papers by this authorOWEN K. ATKIN
Division of Plant Sciences, Research School of Biology, Building 46, The Australian National University, Canberra, ACT 0200, Australia
Search for more papers by this authorAbstract
Understanding the impacts of atmospheric [CO2] and drought on leaf respiration (R) and its response to changes in temperature is critical to improve predictions of plant carbon-exchange with the atmosphere, especially at higher temperatures. We quantified the effects of [CO2]-enrichment (+240 ppm) on seasonal shifts in the diel temperature response of R during a moderate summer drought in Eucalyptus saligna growing in whole-tree chambers in SE Australia. Seasonal temperature acclimation of R was marked, as illustrated by: (1) a downward shift in daily temperature response curves of R in summer (relative to spring); (2)≈60% lower R measured at 20oC (R20) in summer compared with spring; and (3) homeostasis over 12 months of R measured at prevailing nighttime temperatures. R20, measured during the day, was on average 30–40% higher under elevated [CO2] compared with ambient [CO2] across both watered and droughted trees. Drought reduced R20 by≈30% in both [CO2] treatments resulting in additive treatment effects. Although [CO2] had no effect on seasonal acclimation, summer drought exacerbated the seasonal downward shift in temperature response curves of R. Overall, these results highlight the importance of seasonal acclimation of leaf R in trees grown under ambient- and elevated [CO2] as well as under moderate drought. Hence, respiration rates may be overestimated if seasonal changes in temperature and drought are not considered when predicting future rates of forest net CO2 exchange.
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