The present invention relates to genetically modified plant cells and plants in which the genetic modification leads to a reduction in GBSSI, SSIII and BEI activity in comparison to the activity in corresponding wild type plant cells or wild type plants. Furthermore, the present invention relates to methods for the production of such plant cells and plants. The present invention also relates to the starch produced by the plant cells of the invention or plants of the invention, as well as to methods for the production of this starch and derivatised starch.