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. 2017 Jul 26;8:1281. doi: 10.3389/fpls.2017.01281

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Copyright © 2017 Fini, Brunetti, Loreto, Centritto, Ferrini and Tattini.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The relationship between (A) internal isoprene concentration (Iso_i); (B) percent of fresh assimilated carbon lost as isoprene emission (C_iso); (C) isoprene emission (Iso_e) and stomatal conductance (g_s). Isoprene concentration was calculated using a simplified version of the equation proposed by Singsaas et al. (1997), as Iso_i = 2.83 × Iso_e/g_s, where the factor 2.83 is the ratio of the diffusion coefficient of water vapor through air to that of isoprene through air; C_iso = 5 × (Iso_e, μmol m^-2 s^-1)/(A_N, μmol m^-2 s^-1) × 100. Non-linear correlations have been drawn using the following exponential decay curve, Iso_x = a ^{-b ×χ}. Data points derive from the experimental data reported in: Brilli et al. (2007) (Populus alba: ); Brilli et al. (2013) (Eucalyptus citriodora: ); Funk et al. (2004) (P. deltoides: ); Tani et al. (2011) (Quercus serrata: ); Tattini et al. (2014) (Nicotiana tabacum: ○); Tattini et al. (2015) (Platanus × acerifolia: ●); Velikova et al. (2016) (Arundo donax: ▄); Pegoraro et al. (2004) (Q. virginiana: ); Dani et al. (2014) (▴, E. occidentalis and E. camaldulensis: ); Staudt et al. (2016) (Q. pubescens: ); Marino et al. (2017) (P. nigra: □); Brunetti et al., personal communication, (Moringa oleifera: Δ).

Inline graphic — The relationship between (A) internal isoprene concentration (Iso_i); (B) percent of fresh assimilated carbon lost as isoprene emission (C_iso); (C) isoprene emission (Iso_e) and stomatal conductance (g_s). Isoprene concentration was calculated using a simplified version of the equation proposed by Singsaas et al. (1997), as Iso_i = 2.83 × Iso_e/g_s, where the factor 2.83 is the ratio of the diffusion coefficient of water vapor through air to that of isoprene through air; C_iso = 5 × (Iso_e, μmol m^-2 s^-1)/(A_N, μmol m^-2 s^-1) × 100. Non-linear correlations have been drawn using the following exponential decay curve, Iso_x = a ^{-b ×χ}. Data points derive from the experimental data reported in: Brilli et al. (2007) (Populus alba: ); Brilli et al. (2013) (Eucalyptus citriodora: ); Funk et al. (2004) (P. deltoides: ); Tani et al. (2011) (Quercus serrata: ); Tattini et al. (2014) (Nicotiana tabacum: ○); Tattini et al. (2015) (Platanus × acerifolia: ●); Velikova et al. (2016) (Arundo donax: ▄); Pegoraro et al. (2004) (Q. virginiana: ); Dani et al. (2014) (▴, E. occidentalis and E. camaldulensis: ); Staudt et al. (2016) (Q. pubescens: ); Marino et al. (2017) (P. nigra: □); Brunetti et al., personal communication, (Moringa oleifera: Δ).