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Drought increases heat tolerance of leaf respiration in Eucalyptus globulus saplings grown under both ambient and elevated atmospheric [CO₂] and temperature

Gauthier, Paul P. G.; Crous, Kristine Y.; Ayub, Gohar; Duan, Honglang; Weerasinghe, Lasantha K.; Ellsworth, David S.; Tjoelker, Mark G.; Evans, John R.; Tissue, David T.; Atkin, Owen K.

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Climate change is resulting in increasing atmospheric [CO₂], rising growth temperature (T), and greater frequency/severity of drought, with each factor having the potential to alter the respiratory metabolism of leaves. Here, the effects of elevated atmospheric [CO₂], sustained warming, and drought on leaf dark respiration (R(dark)), and the short-term T response of R(dark) were examined in Eucalyptus globulus. Comparisons were made using seedlings grown under different [CO₂], T, and drought...[Show more]

dc.contributor.authorGauthier, Paul P. G.
dc.contributor.authorCrous, Kristine Y.
dc.contributor.authorAyub, Gohar
dc.contributor.authorDuan, Honglang
dc.contributor.authorWeerasinghe, Lasantha K.
dc.contributor.authorEllsworth, David S.
dc.contributor.authorTjoelker, Mark G.
dc.contributor.authorEvans, John R.
dc.contributor.authorTissue, David T.
dc.contributor.authorAtkin, Owen K.
dc.date.accessioned2015-04-13T00:43:08Z
dc.date.available2015-04-13T00:43:08Z
dc.identifier.issn0022-0957
dc.identifier.urihttp://hdl.handle.net/1885/13220
dc.description.abstractClimate change is resulting in increasing atmospheric [CO₂], rising growth temperature (T), and greater frequency/severity of drought, with each factor having the potential to alter the respiratory metabolism of leaves. Here, the effects of elevated atmospheric [CO₂], sustained warming, and drought on leaf dark respiration (R(dark)), and the short-term T response of R(dark) were examined in Eucalyptus globulus. Comparisons were made using seedlings grown under different [CO₂], T, and drought treatments. Using high resolution T-response curves of R(dark) measured over the 15-65 °C range, it was found that elevated [CO₂], elevated growth T, and drought had little effect on rates of R(dark) measured at T <35 °C and that there was no interactive effect of [CO₂], growth T, and drought on T response of R(dark). However, drought increased R(dark) at high leaf T typical of heatwave events (35-45 °C), and increased the measuring T at which maximal rates of R(dark) occurred (Tmax) by 8 °C (from 52 °C in well-watered plants to 60 °C in drought-treated plants). Leaf starch and soluble sugars decreased under drought and elevated growth T, respectively, but no effect was found under elevated [CO₂]. Elevated [CO₂] increased the Q₁₀ of R(dark) (i.e. proportional rise in R(dark) per 10 °C) over the 15-35 °C range, while drought increased Q₁₀ values between 35 °C and 45 °C. Collectively, the study highlights the dynamic nature of the T dependence of R dark in plants experiencing future climate change scenarios, particularly with respect to drought and elevated [CO₂].
dc.description.sponsorshipThis work was funded by the Australian Research Council (ARC FT0991448, DP1093759, and CE140100008, to OKA; and DP0879531, to DTT). This project is supported by funding from the Australian Government Department of Agriculture, Fisheries and Forestry under its Forest Industries Climate Change Research Fund programme. Support for the renovation of the Hawkesbury Forest Experiment tree chambers to improve T and humidity control of the WTC was provided as part of an initiative of the Australian Government through the Education Investment Fund supporting research infrastructure.
dc.publisherOxford University Press
dc.rights© The Author 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.sourceJournal of Experimental Botany
dc.subjectdark respiration
dc.subjecteucalyptus globulus
dc.subjectQ₁₀
dc.subjectdrought
dc.subjectelevated CO₂
dc.subjecttemperature response
dc.titleDrought increases heat tolerance of leaf respiration in Eucalyptus globulus saplings grown under both ambient and elevated atmospheric [CO₂] and temperature
dc.typeJournal article
local.identifier.citationvolume65
dcterms.dateAccepted2014-09-09
dc.date.issued2014
local.identifier.absfor060203 - Ecological Physiology
local.identifier.absfor060705 - Plant Physiology
local.identifier.absfor069902 - Global Change Biology
local.identifier.ariespublicationu4956746xPUB424
local.publisher.urlhttp://www.oxfordjournals.org/en/
local.type.statusPublished Version
local.contributor.affiliationGauthier, P. P. G., Division of Plant Sciences, Research School of Biology, The Australian National University
local.contributor.affiliationCrous, K. Y., Division of Plant Sciences, Research School of Biology, The Australian National University
local.contributor.affiliationAyub, G., Division of Plant Sciences, Research School of Biology, The Australian National University
local.contributor.affiliationWeerasinghe, L. K., Division of Plant Sciences, Research School of Biology, The Australian National University
local.contributor.affiliationEvans, J. R., Division of Plant Sciences, Research School of Biology, The Australian National University
local.contributor.affiliationAtkin, O. K., Division of Plant Sciences, Research School of Biology, The Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/FT0991448
dc.relationhttp://purl.org/au-research/grants/arc/DP1093759
dc.relationhttp://purl.org/au-research/grants/arc/CE140100008
dc.relationhttp://purl.org/au-research/grants/arc/DP0879531
local.identifier.essn1460-2431
local.bibliographicCitation.issue22
local.bibliographicCitation.startpage6471
local.bibliographicCitation.lastpage6485
local.identifier.doi10.1093/jxb/eru367
local.identifier.absseo829899 - Environmentally Sustainable Plant Production not elsewhere classified
local.identifier.absseo820199 - Forestry not elsewhere classified
local.identifier.absseo960305 - Ecosystem Adaptation to Climate Change
dc.date.updated2015-12-09T11:11:46Z
local.identifier.scopusID2-s2.0-84922440725
local.identifier.thomsonID000348154300013
CollectionsANU Research Publications

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