Sesquiterpene and monoterpene synthase involved in the biosynthesis of volatile compounds present in floral scent (PubMed:25056927). Mediates the conversion of (2E)-geranyl diphosphate (GPP) into linalool, with trace levels of myrcene, limonene and (Z)-beta-ocimene (PubMed:25056927). Acts also as a sesquiterpene synthase by catalyzing the conversion of farnesyl diphosphate (FPP) to alpha-bergamotene and beta-bisabolene and to minor products including alpha-curcumene, cis-alpha-bisabolene, beta-farnesene and beta-sesquiphellandrene, as well as seven other unidentified sesquiterpenes (PubMed:25056927). (2E)-geranyl diphosphate + H2O = (R)-linalool + diphosphate (2E)-geranyl diphosphate + H2O = (S)-linalool + diphosphate (2E,6E)-farnesyl diphosphate = (S)-beta-bisabolene + diphosphate (2E,6E)-farnesyl diphosphate = (E,R)-alpha-bisabolene + diphosphate (2E,6E)-farnesyl diphosphate = (E)-beta-farnesene + diphosphate (2E,6E)-farnesyl diphosphate = beta-sesquiphellandrene + diphosphate (2E,6E)-farnesyl diphosphate = (1S,5S,6R)-alpha-bergamotene + diphosphate Binds 3 Mg(2+) or Mn(2+) ions per subunit. kcat is 0.088 sec(-1) with (2E)-geranyl diphosphate as substrate. Optimum pH is 7.5 (PubMed:25056927). Active at pH between 6.0 and 9.0 (PubMed:25056927). Optimum temperature is 30 degrees Celsius. Secondary metabolite biosynthesis; terpenoid biosynthesis. Highly expressed in flowers, petals and sepals, but almost undetectable in vegetative organs. During flower development, Progressive accumlation in petals during the first 40 hours, peaking at full bloom, and fades out from 40 to 64 hours. The Asp-Asp-Xaa-Xaa-Asp/Glu (DDXXD/E) motif is important for the catalytic activity, presumably through binding to Mg(2+). Belongs to the terpene synthase family. Tpsa subfamily.