Patent ID: 6940001

Claim:
A transgenic potato plant cell which is genetically modified, the genetic modification leading to a decrease in the activity of one or more granule-bound starch synthase I (GBSSI) proteins occurring endogenously in the plant cell and to a decrease in the activity of one or more branching enzyme I (BEI) proteins occurring endogenously in the plant cell, in comparison to corresponding non genetically modified plant cells of wild type plants, wherein said genetic modification comprises the introduction of a foreign nucleic acid molecule which comprises DNA molecules selected from the group consisting of: (a) DNA molecules which encode at least one antisense RNA which brings about a decrease in the expression of endogenous genes encoding GBSSI and BEI proteins; (b) DNA molecules which lead, via a cosuppression effect, to a decrease in the expression of endogenous genes encoding GBSSI and BEI proteins; (c) DNA molecules which encode at least one antisense RNA which brings about a decrease in the expression of endogenous genes encoding GBSSI and which encode at least one sense RNA which leads, via a cosuppression effect, to a decrease in the expression of endogenous genes encoding BEI proteins; and (d) DNA molecules which encode at least one antisense RNA which brings about a decrease in the expression of endogenous genes encoding BEI and which encode at least one sense RNA which leads, via a cosuppression effect, to a decrease in the expression of endogenous genes encoding GBSSI proteins; wherein said DNA molecules contain a sequence with a homology of between 95% and 100% to an endogenous gene encoding BEI protein and a sequence with a homology of between about 95% and 100% to an endogenous gene encoding GBSSI protein.