Translate the following English sentence to French:
"On behalf of the Commission, I would like to express my great appreciation for the crucial role which Parliament, and the rapporteur in particular, have played in the negotiations on this directive."
Au nom de la Commission, je voudrais exprimer toute ma satisfaction quant au rôle crucial qu' a joué le Parlement, et en particulier le rapporteur, lors des négociations sur cette directive.