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Published on December 16, 2005; 10.1104/pp.105.070961

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Received September 2, 2005
Returned for revision November 4, 2005
Accepted November 4, 2005

Role of Petal-Specific Orcinol O-Methyltransferases in the Evolution of Rose Scent

Gabriel Scalliet , Claire Lionnet , Mickaël Le Bechec , Laurence Dutron , Jean-Louis Magnard , Sylvie Baudino , Véronique Bergougnoux , Frédéric Jullien , Pierre Chambrier , Philippe Vergne , Christian Dumas , J. Mark Cock , and Philippe Hugueney *

Laboratoire Reproduction et Développement des Plantes, Unité Mixte de Recherche 5667 Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique-Ecole Normale Supérieure de Lyon-Université Claude Bernard Lyon 1, IFR128 Biosciences Lyon-Gerland, Ecole Normale Supérieure de Lyon, 69364 Lyon, France
Département des Sciences de la Vie et de la Terre, Ecole Normale Supérieure de Lyon, 69364 Lyon, France
Laboratoire de Biotechnologies Végétales Appliquées aux Plantes Aromatiques et Médicinales, Université Jean Monnet, 42023 Saint-Etienne, France
Unité Mixte de Recherche 7139 Centre National de la Recherche Scientifique-Université Pierre et Marie Curie, Végétaux Marins et Biomolécules, 29682 Roscoff, France

* Corresponding author; email: philippe.hugueney{at}ens-lyon.fr.

Orcinol O-methyltransferase (OOMT) 1 and 2 catalyze the last two steps of the biosynthetic pathway leading to the phenolic methyl ether 3,5-dimethoxytoluene (DMT), the major scent compound of many rose (Rosa x hybrida) varieties. Modern roses are descended from both European and Chinese species, the latter being producers of phenolic methyl ethers but not the former. Here we investigated why phenolic methyl ether production occurs in some but not all rose varieties. In DMT-producing varieties, OOMTs were shown to be localized specifically in the petal, predominanty in the adaxial epidermal cells. In these cells, OOMTs become increasingly associated with membranes during petal development, suggesting that the scent biosynthesis pathway catalyzed by these enzymes may be directly linked to the cells' secretory machinery. OOMT gene sequences were detected in two non-DMT-producing rose species of European origin, but no mRNA transcripts were detected, and these varieties lacked both OOMT protein and enzyme activity. These data indicate that up-regulation of OOMT gene expression may have been a critical step in the evolution of scent production in roses.




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