QUANTITATIVE STUDY OF NOPALINE SYNTHASE IN PLANT CROWN GALLS I QUANTITATIVE CONIPARISI0N OF NOPALINE SYNTHASE IN CROWN GALL LINES OF DIFFERENT PLANT SPECIES A High Efficient Transformation System and the Introduction of Sweet Protein Gene into Potato (Solanum tuberosum L.) THE TRANSFORMATION OF MONOCOT-BAMBUSA CELLS WITH A. TUMEFACIENS