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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Potosnak, Mark J. Lestourgeon, Lauren Nunez, Othon |
| Description | Author Affiliation: Potosnak MJ ( Department of Environmental Science and Studies, DePaul University, Chicago, IL 60614, USA. Electronic address: mpotosna@depaul.edu.); Lestourgeon L ( Department of Environmental Science and Studies, DePaul University, Chicago, IL 60614, USA.); Nunez O ( Department of Environmental Science and Studies, DePaul University, Chicago, IL 60614, USA.) |
| Abstract | Including algorithms to account for the suppression of isoprene emission by elevated CO2 concentration affects estimates of global isoprene emission for future climate change scenarios. In this study, leaf-level measurements of isoprene emission were made to determine the short-term interactive effect of leaf temperature and CO2 concentration. For both greenhouse plants and plants grown under field conditions, the suppression of isoprene emission was reduced by increasing leaf temperature. For each of the four different tree species investigated, aspen (Populus tremuloides Michx.), cottonwood (Populus deltoides W. Bartram ex Marshall), red oak (Quercus rubra L.), and tundra dwarf willow (Salix pulchra Cham.), the suppression of isoprene by elevated CO2 was eliminated at increased temperature, and the maximum temperature where suppression was observed ranged from 25 to 35°C. Hypotheses proposed to explain the short-term suppression of isoprene emission by increased CO2 concentration were tested against this observation. Hypotheses related to cofactors in the methylerythritol phosphate (MEP) pathway were consistent with reduced suppression at elevated leaf temperature. Also, reduced solubility of CO2 with increased temperature can explain the reduced suppression for the phosphoenolpyruvate (PEP) carboxylase competition hypothesis. Some global models of isoprene emission include the short-term suppression effect, and should be modified to include the observed interaction. If these results are consistent at longer timescales, there are implications for predicting future global isoprene emission budgets and the reduced suppression at increased temperature could explain some of the variable responses observed in long-term CO2 exposure experiments. |
| ISSN | 00489697 |
| Volume Number | 481 |
| e-ISSN | 18791026 |
| Journal | Science of The Total Environment |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-05-15 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Butadienes Metabolism Carbon Dioxide Analysis Climate Change Hemiterpenes Pentanes Plant Leaves Physiology Temperature Populus Quercus Salix Journal Article Research Support, U.s. Gov't, Non-p.h.s. Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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