Genotype Independent Regeneration and Agrobacterium?mediated Genetic Transformation of Sweet Potato (Ipomoea batatas L.)

  • Shubhendu Shekhar Department of Molecular Biology and Biotechnology, Tezpur University, Assam
  • Lalit Agrawal National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi
  • Alak Kumar Buragohain Department of Molecular Biology and Biotechnology, Tezpur University, Assam
  • Asis Datta National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi
  • Subhra Chakraborty National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi
  • Niranjan Chakraborty Department of Molecular Biology and Biotechnology, Tezpur University, Assam
Keywords: Sweet potato, Somatic embryogenesis, Selectable marker, GUS expression

Abstract

Development of an efficient genotype independent regeneration and genetic transformation system in sweet potato continues to be of great interest. Agrobacterium?mediated genetic transformation protocol was established in two different cultivars of sweet potato using Agrobacterium strain EHA105 harbouring binary plasmid pBI121 containing GUS and nptII genes. The internodal stem segments from 30?day?old micropropogated plants were used as explant with different combinations of media and hormones. MS and LS media with various concentrations of growth regulators proved to be non?responsive and the infecundity was severe with the addition of cytokinins. Nonetheless, MS with 2,4?D and TDZ gave a good percentage of callusing but with low differentiation. In different concentrations of NAA, significant amount of callusing was observed but percentage of rooting remained low in both the genotypes. Gamborgs B5 supplemented with NAA proved to be the most suitable media and hormone combination, which yielded shoot formation after 8 ? 10 weeks with a regenera? tion efficiency of 40 ? 70%. Stable integration of transgene was confirmed by PCR analysis. Furthermore, qRT?PCR analysis was performed to assess the transcript accumulation in addition to the GUS enzymatic assay in the transgenic lines.

Plant Tissue Cult. & Biotech. 23(1): 87?100, 2013 (June)

DOI: http://dx.doi.org/10.3329/ptcb.v23i1.15565

D.O.I. 10.3329/ptcb.v23i1.15565

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Abstract
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Published
2013-07-03
How to Cite
Shekhar, S., Agrawal, L., Buragohain, A., Datta, A., Chakraborty, S., & Chakraborty, N. (2013). Genotype Independent Regeneration and Agrobacterium?mediated Genetic Transformation of Sweet Potato (Ipomoea batatas L.). Plant Tissue Culture and Biotechnology, 23(1), 87?100. https://doi.org/10.3329/ptcb.v23i1.15565
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Articles