Genetic transformation of NERICA,interspecific hybrid rice between Oryza glaberrima and O. sativa, mediated by Agrobacterium tumefaciens |
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Authors: | Takuma Ishizaki Takashi Kumashiro |
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Affiliation: | (1) Biological Resources Division, Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba Ibaraki, 305-8686, Japan;(2) Tropical Agriculture Research Front, JIRCAS, 1091-1 Maezato-Kawarabaru, Ishigaki Okinawa, 907-0002, Japan |
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Abstract: | We developed an efficient gene transfer method mediated by Agrobacterium tumefaciens for introgression of new rice for Africa (NERICA) cultivars, which are derivatives of interspecific hybrids between Oryza glaberrima Steud. and O. sativa L. Freshly isolated immature embryos were inoculated with A. tumefaciens LBA4404 that harbored binary vector pBIG-ubi::GUS or pIG121Hm, which each carried a hygromycin-resistance gene and a GUS gene. Growth medium supplemented with 500 mg/l cefotaxime and 20 mg/l hygromycin was suitable for elimination of bacteria and selection of transformed cells. Shoots regenerated from the selected cells on MS medium containing 20 g/l sucrose, 30 g/l sorbitol, 2 g/l casamino acids, 0.25 mg/l naphthaleneacetic acid, 2.5 mg/l kinetin, 250 mg/l cefotaxime, and 20 mg/l hygromycin. The shoots developed roots on hormone-free MS medium containing 30 mg/l hygromycin. Integration and expression of the transgenes were confirmed by PCR, Southern blot analysis, and histochemical GUS assay. Stable integration, expression, inheritance, and segregation of the transgenes were demonstrated by molecular and genetic analyses in the T0 and T1 generations. Most plants were normal in morphology and fertile. The transformation protocol produced stable transformants from 16 NERICA cultivars. We also obtained transformed plants by inoculation of calluses derived from mature seeds, but the frequency of transformation was lower and sterility was more frequent. |
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Keywords: | Agrobacterium tumefaciens NERICA Transformation |
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