Appendix S1 Attribution of woody species of the flora of Italy to classes of Ellenberg indicator values for moisture and to isoprenoid emission types.

Appendix S2 List of references used to reconstruct the phylogenetic relationships of species.

Appendix S3 IspS phylogenetic analysis on Mediterranean species of the genus Populus and Salix sampled for isoprene emission in this study and belonging to different classes of EIVM (Appendix S1), and on outgroups (North-American species) for which IspS accessions are available.

Appendix S4 Primers used in amplification and sequencing of IspS.

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