<i>Agrobacterium</i>-mediated genetic transformation using cotyledons in Japanese pear (<i>Pyrus pyrifolia</i>)

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  • Nakajima Ikuko
    Graduate School of Life and Environmental Science, University of Tsukuba NARO Institute of Fruit Tree Science
  • Sato Yoshihiko
    NARO Institute of Fruit Tree Science
  • Saito Toshihiro
    NARO Institute of Fruit Tree Science
  • Moriguchi Takaya
    Graduate School of Life and Environmental Science, University of Tsukuba NARO Institute of Fruit Tree Science
  • Yamamoto Toshiya
    Graduate School of Life and Environmental Science, University of Tsukuba NARO Institute of Fruit Tree Science

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  • Agrobacterium-mediated genetic transformation using cotyledons in Japanese pear (Pyrus pyrifolia)

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Abstract

Genetic transformation was successfully established producing both transformed adventitious shoots and calli in Japanese pear (Pyrus pyrifolia Nakai) by using cotyledons as explants. Cotyledons of five cultivars were co-cultivated with Agrobacterium tumefaciens strain LBA4404 carrying the pBIN19-sgfp, which contained a green fluorescent protein gene and the neomycin phosphotransferase gene. In order to increase transformation efficiency, sonication and ethylenedioxybis (ethylamine)-N,N,N′,N′-tetraacetic acid (EGTA) treatments were applied, which could produce physical wounds across the tissue and prevent plant defense reaction, respectively. Green fluorescent protein (GFP) fluorescence was evaluated two weeks and five months after Agrobacterium inoculation as measures of transient and stable transformations, respectively. As a result, sonication significantly increased both transient and stable expression of GFP fluorescence, whereas EGTA treatment did not show a positive effect on either. Out of 18 regenerated plantlets obtained, one plant regenerated from ‘Agenosho Shinanashi’ showed stable GFP fluorescence. This plant was confirmed as a transformant by PCR and genomic Southern blotting. Three other transformed regenerated shoots by myb gene showed red color, which were derived from ‘Imamuraaki’ by the same transformation method. Transformation system in this study was shown to be reproducible since plural transformants were obtained.

Journal

  • Breeding Science

    Breeding Science 63 (3), 275-283, 2013

    Japanese Society of Breeding

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