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Fig. S1 Isoprene emissions of Populus nigra vs internal CO2 concentration (Ci) using the conceptual model from Morfopoulos et al. (2013).

Fig. S2 Isoprene emissions of Populus nigra vs photosynthetic photon flux density (PPFD).

Fig. S3 Assimilation curves of Populus nigra.

Fig. S4 Isoprene response to changes in internal CO2 concentration (Ci) using the Niinemets model modified by Arneth et al. (2007).

Fig. S5 Observed isoprene emission rates vs light-limited electron flux (J) for hybrid aspen.

Fig. S6 Supplementary statistics for Populus nigra.

Fig. S7 Supplementary statistics for hybrid aspen.

Table S1 Isoprene emissions vs changes in photosynthetic photon flux density (PPFD) at different CO2 concentrations

Table S2 Description and values of the parameters of the Farquhar model used in standard simulations

Notes S1 Comparison of the new energetic status model with the conceptual model from Morfopoulos et al. (2013).

Notes S2 Additional details on the model of photosynthetic carbon assimilation.