Phylogeny of the TPS-a subfamily. Maximum likelihood analysis of TPS-a subfamily from E. grandis and E. globulus in comparison to Vitis vinifera and Arabidopsis thaliana. Functionally characterized enzymes are indicated with an * with main products: *1 isoledene / cadinene, *2 germacrene D, *3 bicyclogermacrene. Bootstrap values supported by ≥ 80% are disignated * while those with bootstrap values ≥ 95% are designated O. Two TPS-b genes from E. grandis and P. trichocarpa were selected as outgroups.