First Author:   Fabian Bergès UMR GREMAQ-INRA Fabian.Berges@toulouse.inra.fr   Bureau MF 327, Manufacture des Tabacs, 21 Allée de Brienne Toulouse, F-31000, FRANCE   +33561128580(Phone) +33561128580(Fax) Second Author: Sylvette Monier-Dilhan INRA ODR Sylvette.Monier@toulouse.inra.fr   24 Chemin de BORDEROUGE, AUZEVILLE CS 52627 CASTANET TOLOSAN Cédex, F-31326, FRANCE   +33561285089(Phone) +33561285372(Fax)