Mechanisms underlying the amelioration of O3-induced damage by elevated atmospheric concentrations of CO2

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Show simple item record Cardoso-Vilhena, J Balaguer, L Eamus, D Ollerenshaw, J Barnes, J 2009-12-21T02:30:13Z 2004-03
dc.identifier.citation Journal of Experimental Botany, 2004, 55 (397), pp. 771 - 781
dc.identifier.issn 0022-0957
dc.identifier.other C1 en_US
dc.description.abstract There is growing evidence that rising atmospheric CO2 concentrations will reduce or prevent reductions in the growth and productivity of C3 crops attributable to ozone (O3) pollution. In this study, the role of pollutant exclusion in mediating this response was investigated through growth chamber-based investigations on leaves 4 and 7 of spring wheat (Triticum aestivum cv. Hanno). In the core experiments, plants were raised at two atmospheric CO2 concentrations (ambient [350 μl l-1] or elevated CO2 [700 μl l-1] under two O3 regimes (charcoal/Purafil®-filtered air [<5 nl l-1 O3] or ozone-enriched air [75 nl l-1 7 h d-1]). A subsequent experiment used an additional O3 treatment where the goal was to achieve equivalent daily O3 uptake over the life-span of leaves 4 and 7 under ambient and CO2-enriched conditions, through daily adjustment of exposures based on measured shifts in stomatal conductance. Plant growth and net CO2 assimilation were stimulated by CO2-enrichment and reduced by exposure to O 3. However, the impacts of O3 decreased with plant age (i.e. leaf 7 was more resistant to O3 injury than leaf 4); a finding consistent with ontogenic shifts in the tolerance of plant tissue and/or acclimation to O3-induced oxidative stress. In the combined treatment, elevated CO2 protected against the adverse effects of O3 and reduced cumulative O3 uptake (calculated from measurements of stomatal conductance) by c. 10% and 35% over the life-span of leaves 4 and 7, respectively. Analysis of the relationship between O 3 uptake and the decline in the maximum in vivo rate of Rubisco carboxylation (Vcmax) revealed the protection afforded by CO 2-enrichment to be due, to a large extent, to the exclusion of the pollutant from the leaf interior (as a consequence of the decline in stomatal conductance triggered by CO2-enrichment), but there was evidence (especially from flux-response relationships constructed for leaf 4) that CO2-enrichment resulted in additional effects that alleviated the impacts of ozone-induced oxidative stress on photosynthesis.
dc.language eng
dc.relation.isbasedon 10.1093/jxb/erh080
dc.title Mechanisms underlying the amelioration of O3-induced damage by elevated atmospheric concentrations of CO2
dc.type Journal Article
dc.parent Journal of Experimental Botany
dc.journal.volume 397
dc.journal.volume 55
dc.journal.number en_US
dc.publocation Oxford en_US
dc.identifier.startpage 771 en_US
dc.identifier.endpage 781 en_US DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 0607 Plant Biology
dc.personcode 000006
dc.percentage 100 en_US Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Air pollutant interactions
dc.description.keywords Detoxification
dc.description.keywords Ozone uptake
dc.description.keywords Rising atmospheric CO2 concentrations
dc.description.keywords Spring wheat
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)

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