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Particle-Bombardment-Mediated Co-Transformation of Maize with a Lysine Rich Protein Gene (sb401) from potato

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Summary

Little work has been reported on genetic transformation with maize inbred lines, especially elite inbred lines used in breeding. In this work, 7 self-pollinated inbred lines and 4 hybrid lines have been screened. The results revealed that calli derived from immature embryos from two inbred lines X333 and X301 were compact, hyperhydric and unsuitable for transformation, but the calli induced from other inbred lines and all the hybrid lines were friable and yellow and could be used for genetic transformation. The sb401 gene isolated from potato (Solanum berthaultii) encodes a protein with a high lysine content. Maize calli from 5 self-pollinated inbred lines and 4 hybrid lines were transformed using particle-bombardment with different plasmids to simultaneously introduce the sb401 lysine rich gene and the selectable gene hpt respectively. Two hundred and sixty-eight regenerated plants were obtained from these genotypes. Co-insertion was confirmed in 29 regenerated plants by PCR and Southern blot analysis. Transgene segregation of the R1 plants was observed and one marker-free transgenic maize line was recovered. Analysis of the crude protein content in mature seeds of R1 transgenic plants also showed an increase from 36.8% to 48.2%. This study thus provides a workable system for generating transgenic maize free from selectable marker genes and generates valuable resources for obtaining marker free transgenic maize with a high-lysine protein content.

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Abbreviations

2,4-D,2:

4-dichlorophenoxy acetic acid

6-BA:

6-benzylamino purine

hpt:

hygromycin B phosphotransferase

Lrp:

lysine rich protein

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Authors and Affiliations

  1. State Key Laboratory for Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, No.2 Yuanmingyuan West Road, Haidian District, Beijing, 100094, P.R.China

    Dongxue Wang, Qian Zhao, Dengyun Zhu, Guangming Ao & Jingjuan Yu

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  1. Dongxue Wang
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  2. Qian Zhao
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  3. Dengyun Zhu
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  4. Guangming Ao
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  5. Jingjuan Yu
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Correspondence to Jingjuan Yu.

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Wang, D., Zhao, Q., Zhu, D. et al. Particle-Bombardment-Mediated Co-Transformation of Maize with a Lysine Rich Protein Gene (sb401) from potato. Euphytica 150, 75–85 (2006). https://doi.org/10.1007/s10681-006-9095-6

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  • DOI: https://doi.org/10.1007/s10681-006-9095-6

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