The Flower Morphogenesis group and collaborating partners used transcriptomic and genetic approaches to show that monoterpenes biosynthesis in roses differs from what is known in other plants and involves a specialized Nudix hydrolase protein localized in the cytoplasm of rose petal cells. Data recently published in Science.
Magnard JL, Roccia A, Caissard JC, Vergne P, Sun P, Hecquet R, Dubois A, Hibrand-Saint Oyant L, Jullien F, Nicolè F, Raymond O, Huguet S, Baltenweck R, Meyer S, Claudel P, Jeauffre J, Rohmer M, Foucher F, Hugueney P*, Bendahmane M*, Baudino S* (2015) Biosynthesis of monoterpene scent compounds in roses. Science . Jul 3; 349(6243):81-3. DOI: 10.1126/science.aab0696
http://www.sciencemag.org/content/349/6243