The binary plasmid pRUR528 (Szwacka et al. 2002)
carrying the thaumatin II cDNA under the control of the 35S CaMV
promoter was used. Plasmid pRUR528 was derived from pROK2 in
which the gus gene coding sequence was replaced with the thaumatin
cDNA as described by Szwacka et al. (2002). The T-DNA region of
pRUR528 is shown in Fig. 1. As a positive control the binary plasmid
pBI121 (Jefferson et al. 1987) carrying the 35S-gus gene construct
(Clontech, Palo Alto, CA, USA) was used. Both binary plasmids
possess the nptII gene conditioning kanamycin resistance. Plasmids
were introduced into A. tumefaciens strain LBA4404