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

Functional Plant Biology : FPB
Emiliano PegoraroRamesh Murthy

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 ...Continue Reading

References

Jan 17, 2003·Nature·Todd N RosenstielRussell K Monson
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Citations

Jul 15, 2016·Plant, Cell & Environment·Xiangyang YuanZhaozhong Feng
May 22, 2007·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Russell K MonsonRay Fall
Jan 24, 2008·Plant Biology·R Grote, U Niinemets
May 24, 2020·Global Change Biology·Ana M Yáñez-SerranoJosep Peñuelas
Mar 9, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·R G ZeppB Sulzberger
Jun 29, 2012·The New Phytologist·Russell K MonsonJörg-Peter Schnitzler
Oct 25, 2013·Journal of Experimental Botany·Zhihong SunÜlo Niinemets
Feb 6, 2010·Trends in Plant Science·Francesco Loreto, Jörg-Peter Schnitzler

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