Carbohydrate Research 288 (1996) 189-201. 18. Manuela Röber, Klaus Geider, Bernd Müller-Röber, and Lothar Willmitzer: Synthesis of fructans in tubers of transgenic starch-deficient potato plants does not result in an increased allocation of carbohydrates. (Quelle: bmb+f Forschungslandkarte Deutschland 1998)