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Within-plant isoprene oxidation confirmed by direct emissions of oxidation products methyl vinyl ketone and methacrolein

Jardine, Kolby J.; Monson, Russell K.; Abrell, Leif; Saleska, Scott R.; Arneth, Almut LU ; Jardine, Angela; Ishida, Francoise Yoko; Yanez Serrano, Ana Maria; Artaxo, Paulo and Karl, Thomas, et al. (2012) In Global Change Biology 18(3). p.973-984
Abstract
Isoprene is emitted from many terrestrial plants at high rates, accounting for an estimated 1/3 of annual global volatile organic compound emissions from all anthropogenic and biogenic sources combined. Through rapid photooxidation reactions in the atmosphere, isoprene is converted to a variety of oxidized hydrocarbons, providing higher order reactants for the production of organic nitrates and tropospheric ozone, reducing the availability of oxidants for the breakdown of radiatively active trace gases such as methane, and potentially producing hygroscopic particles that act as effective cloud condensation nuclei. However, the functional basis for plant production of isoprene remains elusive. It has been hypothesized that in the cell... (More)
Isoprene is emitted from many terrestrial plants at high rates, accounting for an estimated 1/3 of annual global volatile organic compound emissions from all anthropogenic and biogenic sources combined. Through rapid photooxidation reactions in the atmosphere, isoprene is converted to a variety of oxidized hydrocarbons, providing higher order reactants for the production of organic nitrates and tropospheric ozone, reducing the availability of oxidants for the breakdown of radiatively active trace gases such as methane, and potentially producing hygroscopic particles that act as effective cloud condensation nuclei. However, the functional basis for plant production of isoprene remains elusive. It has been hypothesized that in the cell isoprene mitigates oxidative damage during the stress-induced accumulation of reactive oxygen species (ROS), but the products of isoprene-ROS reactions in plants have not been detected. Using pyruvate-2-13C leaf and branch feeding and individual branch and whole mesocosm flux studies, we present evidence that isoprene (i) is oxidized to methyl vinyl ketone and methacrolein (iox) in leaves and that iox/i emission ratios increase with temperature, possibly due to an increase in ROS production under high temperature and light stress. In a primary rainforest in Amazonia, we inferred significant in plant isoprene oxidation (despite the strong masking effect of simultaneous atmospheric oxidation), from its influence on the vertical distribution of iox uptake fluxes, which were shifted to low isoprene emitting regions of the canopy. These observations suggest that carbon investment in isoprene production is larger than that inferred from emissions alone and that models of tropospheric chemistry and biotachemistryclimate interactions should incorporate isoprene oxidation within both the biosphere and the atmosphere with potential implications for better understanding both the oxidizing power of the troposphere and forest response to climate change. (Less)
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keywords
Amazon, biosphere-atmosphere interactions, isoprene oxidation, methacrolein, methyl vinyl ketone, reactive oxygen species, temperature, stress, thermotolerance
in
Global Change Biology
volume
18
issue
3
pages
973 - 984
publisher
Wiley-Blackwell
external identifiers
  • wos:000300671600015
  • scopus:84857142363
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2011.02610.x
language
English
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yes
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ab08a93a-a6f8-47f9-9b49-373cec67a313 (old id 2591439)
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2012-06-04 12:47:26
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2017-11-12 03:00:39
@article{ab08a93a-a6f8-47f9-9b49-373cec67a313,
  abstract     = {Isoprene is emitted from many terrestrial plants at high rates, accounting for an estimated 1/3 of annual global volatile organic compound emissions from all anthropogenic and biogenic sources combined. Through rapid photooxidation reactions in the atmosphere, isoprene is converted to a variety of oxidized hydrocarbons, providing higher order reactants for the production of organic nitrates and tropospheric ozone, reducing the availability of oxidants for the breakdown of radiatively active trace gases such as methane, and potentially producing hygroscopic particles that act as effective cloud condensation nuclei. However, the functional basis for plant production of isoprene remains elusive. It has been hypothesized that in the cell isoprene mitigates oxidative damage during the stress-induced accumulation of reactive oxygen species (ROS), but the products of isoprene-ROS reactions in plants have not been detected. Using pyruvate-2-13C leaf and branch feeding and individual branch and whole mesocosm flux studies, we present evidence that isoprene (i) is oxidized to methyl vinyl ketone and methacrolein (iox) in leaves and that iox/i emission ratios increase with temperature, possibly due to an increase in ROS production under high temperature and light stress. In a primary rainforest in Amazonia, we inferred significant in plant isoprene oxidation (despite the strong masking effect of simultaneous atmospheric oxidation), from its influence on the vertical distribution of iox uptake fluxes, which were shifted to low isoprene emitting regions of the canopy. These observations suggest that carbon investment in isoprene production is larger than that inferred from emissions alone and that models of tropospheric chemistry and biotachemistryclimate interactions should incorporate isoprene oxidation within both the biosphere and the atmosphere with potential implications for better understanding both the oxidizing power of the troposphere and forest response to climate change.},
  author       = {Jardine, Kolby J. and Monson, Russell K. and Abrell, Leif and Saleska, Scott R. and Arneth, Almut and Jardine, Angela and Ishida, Francoise Yoko and Yanez Serrano, Ana Maria and Artaxo, Paulo and Karl, Thomas and Fares, Silvano and Goldstein, Allen and Loreto, Francesco and Huxman, Travis},
  issn         = {1354-1013},
  keyword      = {Amazon,biosphere-atmosphere interactions,isoprene oxidation,methacrolein,methyl vinyl ketone,reactive oxygen species,temperature,stress,thermotolerance},
  language     = {eng},
  number       = {3},
  pages        = {973--984},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Within-plant isoprene oxidation confirmed by direct emissions of oxidation products methyl vinyl ketone and methacrolein},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2011.02610.x},
  volume       = {18},
  year         = {2012},
}