Patent ID: 7589254

Claim:
A method for directing transgenic expression of a nucleic acid sequence in carbohydrate-storing sink tissues of plants, which comprises the following steps: I. introducing, into plant cells, a transgenic expression cassette, wherein the transgenic expression cassette comprises at least the following elements: a) the promoter sequence of the gene encoding the Vicia faba plastidic 1,4-α-D-glucan:phosphate α-D-glucosyltransferase, or a fragment thereof having the same promoter activity, and b) at least one further nucleic acid sequence, wherein the promoter sequence or the fragment thereof and the at least one further nucleic acid sequence are functionally linked together, and the further nucleic acid sequence is heterologous in relation to the promoter sequence, II. selecting transgenic cells which comprise said expression cassette stably integrated into the genome, and III. regenerating intact plants from said transgenic cells, wherein the promoter sequence or the fragment thereof directs expression of the further nucleic acid sequence in carbohydrate-storing sink tissue, but essentially not in source tissues.