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Optimization of Factors Influencing Microinjection Method for Agrobacterium tumefaciens-Mediated Transformation of Tomato

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Abstract

A simple and efficient protocol for Agrobacterium-mediated genetic transformation of tomato was developed using combination of non-tissue culture and micropropagation systems. Initially, ESAM region of 1-day-old germinated tomato seeds were microinjected for one to five times with Agrobacterium inoculums (OD600 = 0.2–1.0). The germinated seeds were cocultivated in the MS medium fortified with (0–200 mM) acetosyringone and minimal concentrations of (0–20 mg L−1) kanamycin, and the antibiotic concentration was doubled during the second round of selection. Bacterial concentration of OD600 = 0.6 served as an optimal concentration for infection and the transformation efficiency was significantly higher of about 46.28 %. In another set of experiment, an improved and stable regeneration system was adapted for the explants from the selection medium. Four-day-old double cotyledonary nodal explants were excised from the microinjected seedlings and cultured onto the MS medium supplemented with 1.5 mg L−1 thidiazuron, 1.5 mg L−1 indole-3-butyric acid, 30 mg L−1 kanamycin, and 0–1.5 mg L−1 adenine sulphate. Maximum of 9 out of 13 micropropagated shoots were shown positive to GUS assay. By this technique, the transformation efficiency was increased from 46.28 to 65.90 %. Thus, this paper reports the successful protocol for the mass production of transformants using microinjection and micropropagation techniques.

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Authors and Affiliations

  1. Department of Plant Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-24, 620 024, Tamil Nadu, India

    S. Vinoth, P. Gurusaravanan & N. Jayabalan

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  1. S. Vinoth
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  2. P. Gurusaravanan
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  3. N. Jayabalan
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Correspondence to S. Vinoth or N. Jayabalan.

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Vinoth, S., Gurusaravanan, P. & Jayabalan, N. Optimization of Factors Influencing Microinjection Method for Agrobacterium tumefaciens-Mediated Transformation of Tomato. Appl Biochem Biotechnol 169, 1173–1187 (2013). https://doi.org/10.1007/s12010-012-0006-0

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  • DOI: https://doi.org/10.1007/s12010-012-0006-0

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