The present invention relates to the use of recombinant DNA technology in the modification of plant oils. In particular, the invention relates to the identification of novel promoter sequences of the FAE1-1 and FAE1-2 genes of Brassica napus and the FAE1 gene of Arabidopsis thaliana. The invention also relates to the host cells and plants transformed with the nucleic acid sequences of the invention, and methods of producing oil.