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Author (up) Way, D.A.; Ghirardo, A.; Kanawati, B.; Esperschutz, J.; Monson, R.K.; Jackson, R.B.; Schmitt-Kopplin, P.; Schnitzler, J.-P.
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  Title Increasing atmospheric CO reduces metabolic and physiological differences between isoprene- and non-isoprene-emitting poplars Type Journal Article
  Year 2013 Publication The New Phytologist Abbreviated Journal New Phytol  
  Volume Issue Pages  
  Keywords Co 2; Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR-MS); isoprene; nontargeted metabolomics; poplar  
  Abstract Isoprene, a volatile organic compound produced by some plant species, enhances abiotic stress tolerance under current atmospheric CO2 concentrations, but its biosynthesis is negatively correlated with CO2 concentrations. We hypothesized that losing the capacity to produce isoprene would require stronger up-regulation of other stress tolerance mechanisms at low CO2 than at higher CO2 concentrations. We compared metabolite profiles and physiological performance in poplars (Populus x canescens) with either wild-type or RNAi-suppressed isoprene emission capacity grown at pre-industrial low, current atmospheric, and future high CO2 concentrations (190, 390 and 590 ppm CO2 , respectively). Suppression of isoprene biosynthesis led to significant rearrangement of the leaf metabolome, increasing stress tolerance responses such as xanthophyll cycle pigment de-epoxidation and antioxidant levels, as well as altering lipid, carbon and nitrogen metabolism. Metabolic and physiological differences between isoprene-emitting and suppressed lines diminished as growth CO2 concentrations rose. The CO2 dependence of our results indicates that the effects of isoprene biosynthesis are strongest at pre-industrial CO2 concentrations. Rising CO2 may reduce the beneficial effects of biogenic isoprene emission, with implications for species competition. This has potential consequences for future climate warming, as isoprene emitted from vegetation has strong effects on global atmospheric chemistry.  
  Address Nicholas School of the Environment and Department of Biology, Duke University, Durham, NC, 27708, USA; Department of Biology, Western University, London, ON, Canada, N6A 5B7  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0028-646X ISBN Medium  
  Area Expedition Conference  
  Notes PMID:23822651 Approved no  
  Call Number @ @ Serial 40812  
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