A process for the biotechnological production of Dihydrochalkonen

describes a method for producing a Dihydrochalkons, in particular of phloretin, using a transgenic microorganism comprising a nucleic acid portion (a) comprising or consisting of a gene encoding a bacterial chalcone isomerase gene and / or a nucleic acid section (a ' ), comprising or consisting of a gene encoding a plant chalcone isomerase gene and a nucleic acid section (b) comprising or consisting of a gene encoding a bacterial enoate reductase gene, corresponding transgenic microorganism comprising a nucleic acid portion (a), comprising or consisting of a gene encoding a bacterial chalcone isomerase gene and / or a nucleic acid section (a '), comprising or consisting of a gene encoding a plant chalcone isomerase gene and / or a nucleic acid portion (b) comprising or consisting from a gene encoding a bacterial enoate reductase Ge n, as well as host cells which contain one or more identical or different such vectors.