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apical meristem using Agrobacterium tumefaciens-mediated transformation method. The plant expression vector used in the studycontained GUS gene and NPTI for selection under the control of CaMV35S promoter. Transformed calli and plantlets wereselected on G418-containing media. In order to determine GUS gene expression, a piece of calli or plantlets were histochemicallyassayed. Six transgenic plants were confirmed by PCR. By Southern blot analysis, three plants had the same pattern of band mobil-o cop-ies of transgenes were integrated into the sweetpotato genome. Using leaf assay, transgenic sweetpotato plants showed resistance toparomomycin, indicating that NPTI gene incorporated in the sweetpotato genome was functionally expressed in sweetpotatoplants. Histochemcially GUS positive plants showed resistance to paromomycin, indicating that both genes in T-DNAs were func-tionally expressed in transgenic sweetpotato without silencing. The transgenic sweetpotato plants appeared to be morphologicallynormal compared to wild type plant.