Transgenic plant cells and plants having modified activity of the gbssi and of the be protein

Abstract

Transgenic plant cells and plants are described which synthesize a starch which is modified in comparison to wild-type plant cells and plants and show a decrease in the activity of GBSSI and BE proteins. Furthermore, the modified starches obtainable from these plant cells and plants are described, and processes for their preparation.

1 - 29 . (canceled) 
   
   
       30 . A method of producing potato starch comprising extracting starch from a plant comprising transgenic plant cells which are genetically modified, said genetic modification leading to a decrease in the activity of one or more GBSSI proteins occurring endogenously in the plant cell and to a decrease in the activity of one or more BE proteins occurring endogenously in the plant cell, in comparison to corresponding wild-type plants. 
   
   
       31 . The method of  claim 30 , further comprising harvesting before the step of extracting. 
   
   
       32 . The method of  claim 31 , further comprising cultivating before the step of harvesting. 
   
   
       33 . The method of  claim 30 , wherein said potato starch comprises an amylopectin content of at least 90% and a phosphate content which is increased in comparison to starch from corresponding potato plants of the waxy phenotype by at least 30%, wherein said starch from corresponding potato plants of the waxy phenotype is derived from the Desiree variety. 
   
   
       34 . A method of producing potato starch comprising extracting starch from a plant cell which is genetically modified, said genetic modification leading to a decrease in the activity of one or more GBSSI proteins occurring endogenously in the plant cell and to a decrease in the activity of one or more BE proteins occurring endogenously in the plant cell, in comparison to corresponding wild-type plants. 
   
   
       35 . The method of  claim 34 , comprising harvesting before the step of extracting. 
   
   
       36 . The method of  claim 35 , comprising cultivating before the step of harvesting. 
   
   
       37 . The method of  claim 34 , wherein said potato starch comprises an amylopectin content of at least 90% and a phosphate content which is increased in comparison to starch from corresponding potato plants of the waxy phenotype by at least 30%, wherein said starch from corresponding potato plants of the waxy phenotype is derived from the Desiree variety.