A model of plant isoprene emission based on available reducing power captures responses to atmospheric CO<inf>2</inf>

Catherine Morfopoulos, Dominik Sperlich, Josep Peñuelas, Iolanda Filella, Joan Llusià, Belinda E. Medlyn, Ülo Niinemets, Malcolm Possell, Zhihong Sun, Iain Colin Prentice

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    Abstract

    Summary: We present a unifying model for isoprene emission by photosynthesizing leaves based on the hypothesis that isoprene biosynthesis depends on a balance between the supply of photosynthetic reducing power and the demands of carbon fixation. We compared the predictions from our model, as well as from two other widely used models, with measurements of isoprene emission from leaves of Populus nigra and hybrid aspen (Populus tremula × P. tremuloides) in response to changes in leaf internal CO2 concentration (Ci) and photosynthetic photon flux density (PPFD) under diverse ambient CO2 concentrations (Ca). Our model reproduces the observed changes in isoprene emissions with Ci and PPFD, and also reproduces the tendency for the fraction of fixed carbon allocated to isoprene to increase with increasing PPFD. It also provides a simple mechanism for the previously unexplained decrease in the quantum efficiency of isoprene emission with increasing Ca. Experimental and modelled results support our hypothesis. Our model can reproduce the key features of the observations and has the potential to improve process-based modelling of isoprene emissions by land vegetation at the ecosystem and global scales. © 2014 New Phytologist Trust.
    Original languageEnglish
    Pages (from-to)125-139
    JournalNew Phytologist
    Volume203
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2014

    Keywords

    • Black poplar (Populus nigra)
    • Hybrid aspen (Populus tremula × P. tremuloides)
    • Isoprene emission
    • Light response
    • Modelling
    • Photosynthetic electron transport
    • Quantum yield
    • Volatile compounds

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