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The purpose of this study was to improve transformation efficiency for three Korean rice cultivars, Ilpum, Dasan, and Namyang. Using two different media with or without light,efficiencies of callus induction, regeneration, and transformation of the Korean cultivars were compared to Japanese cultivar, Nipponbare, as a control. Immature cv. Nipponbare seeds produced 35.5% and 16.1% regeneration efficiency on CIM and N6D media, respectively. Among the Korean cultivars, only cv.Ilpum induced on CIM in the dark was actively regenerated with efficiency of 8.2%. With LBA4404 (pTOK233), no difference for the efficiency of transformation was found between mature and immature seeds of cv. Ilpum. This result reveals that mature seeds can be substituted for this study with no difference. The anther-derived calli of cv. Namyang inoculated with either LBA4404 (pTOK233) or EHA101 (pSMABuba) showed regeneration efficiencies of 14.5% and 20.9%, respectively, even though efficiency of transformation did not differ with these two vectors. We suggest that the anther-derived calli are bettermaterials for transformation expreiment due to theirgenotype-independent regeneration. In the assay of GUS, all of the calli that survived on the second selection medium were strongly stained. PCR-Southern blot analyses confirmed that T-DNA was stably transformed in to all tissues selected. Cvs. Nipponbare and Namyang transformed by LBA4404 (pTOK233) showed positive color in the NPTII ELISA.
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