Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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MdMADS2 - transgenic chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura) showing the reduction of the days to flowering

  • Han, Bong-Hee (Floriculture Research Division, National Institute of Horticultural & Herbal Science) ;
  • Lee, Su-Young (Floriculture Research Division, National Institute of Horticultural & Herbal Science) ;
  • Choi, Seong-Youl (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
  • Published : 2009.12.31
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Abstract

This study was conducted to develop new lines expressing the characteristic of early flowering by introducing MdMADS2 gene in chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura) ‘Zinba'. Transformation of chrysanthemum was conducted by Agrobacterium tumefaciens LBA4404 harboring the binary vector containing MdMADS2 controlled by double CaMV 35S promoters. Ninety three shoots were regenerated from 1,463 leaf segment explants cultured on the first selection medium (MS basal salts + 1.0 mg/L BA + 0.5 mg/L IAA + 10 mg/L kanamycin + 400 mg/L cefotaxime, pH 5.8) after co-cultivation, and 20 out of the 93 shoots rooted on the second selection medium containing 20 mg/L kanamycin and 400 mg/L cefotaxime. Many escapes (98.6%) were removed on the selection stage for rooting. Nineteen lines were confirmed as transgenic plant with transgene by PCR analysis. Six transgenic plants flowered 2-11 days earlier than non-transgenic plant without big change of phenotype, and especially, 3 (Mo-7, Mo-11, Mo-17) out of 6 transgenic lines showed a significant reduction in days to flowering compared to non-transgenic plant. Introduction and expression of MdMADS2 gene in them were confirmed by Southern and real-time PCR analyses, respectively.

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References

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