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Article << Previous     |     Next >>   Contents Vol 31(12)

Effect of elevated CO2 concentration and vapour pressure deficit on isoprene emission from leaves of Populus deltoides during drought

Emiliano Pegoraro A B I, Ana Rey B C, Edward G. Bobich A D, Greg Barron-Gafford A E, Katherine Ann Grieve A F, Yadvinder Malhi B G, Ramesh Murthy A H

A Biosphere 2 Laboratory, Columbia University, Oracle, AZ 85 623, USA.
B School of GeoSciences, University of Edinburgh, Darwin Building, Mayfield Road, Edinburgh EH9 3JU, UK.
C Present address: Instituto de Ciencias Ambientales, Universidad de Castilla-La Mancha, Avda. Carlos III, E-45 071 Toledo, Spain.
D Present address: Department of Biology, Whittier College, Whittier, CA 90 608, USA.
E Present address: Department of Ecology and Environmental Biology, University of Arizona, Tucson, AZ 85 721, USA.
F Present address: Quantitative Ecology and Resource Management, University of Washington, Box 352 182, Seattle, WA 98 195, USA.
G Present address: School of Geography and the Environment, University of Oxford, UK.
H Present address: School of Life Sciences, Arizona State University, LSE 218, PO Box 874 501, Tempe, AZ 85 287-4501, USA.
I Corresponding author. Email: e.pegoraro@ed.ac.uk
 
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Abstract

To further our understanding of the influence of global climate change on isoprene production we studied the effect of elevated [CO2] and vapour pressure deficit (VPD) on isoprene emission rates from leaves of Populus deltoides Bartr. during drought stress. Trees, grown inside three large bays with atmospheres containing 430, 800, or 1200 μmol mol–1 CO2 at the Biosphere 2 facility, were subjected to a period of drought during which VPD was manipulated, switching between low VPD (approximately 1 kPa) and high VPD (approximately 3 kPa) for several days. When trees were not water-stressed, elevated [CO2] inhibited isoprene emission and stimulated photosynthesis. Isoprene emission was less responsive to drought than photosynthesis. As water-stress increased, the inhibition of isoprene emission disappeared, probably as a result of stomatal closure and the resulting decreases in intercellular [CO2] (Ci). This assumption was supported by increased isoprene emission under high VPD. Drought and high VPD dramatically increased the proportion of assimilated carbon lost as isoprene. When measured at the same [CO2], leaves from trees grown at ambient [CO2] always had higher isoprene emission rates than the leaves of trees grown at elevated [CO2], demonstrating that CO2 inhibition is a long-term effect.

Keywords: Biosphere 2 Laboratory, carbon loss, cottonwood, elevated CO2, intercellular CO2 concentration, isoprene production, photosynthesis, Populus deltoides, stomatal conductance, water-stress.


   
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