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An improved Agrobacterium-mediated transformation of recalcitrant indica rice (Oryza sativa L.) cultivars

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Abstract

Agrobacterium-mediated transformation of indica rice varieties has been quite difficult as these are recalcitrant to in vitro responses. In the present study, we established a high-efficiency Agrobacterium tumefaciens-mediated transformation system of rice (Oryza sativa L. ssp. indica) cv. IR-64, Lalat, and IET-4786. Agrobacterium strain EHA-101 harboring binary vector pIG121-Hm, containing a gene encoding for β-glucuronidase (GUS) and hygromycin resistance, was used in the transformation experiments. Manipulation of different concentrations of acetosyringone, days of co-culture period, bacterial suspension of different optical densities (ODs), and the concentrations of l-cysteine in liquid followed by solid co-culture medium was done for establishing the protocol. Among the different co-culture periods, 5 days of co-culture with bacterial cells (OD600 nm = 0.5–0.8) promoted the highest frequency of transformation (83.04 %) in medium containing l-cysteine (400 mg l−1). Putative transformed plants were analyzed for the presence of a transgene through genomic PCR and GUS histochemical analyses. Our results also suggest that different cultural conditions and the addition of l-cysteine in the co-culture medium improve the Agrobacterium-mediated transformation frequencies from an average of 12.82 % to 33.33 % in different indica rice cultivars.

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Acknowledgments

This work was supported by OLP-31. MS, SD, AR, and PKV acknowledge the financial support from CSIR. NG acknowledges the financial support from ICMR.

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The authors declare that they have no conflict of interest associated with this work.

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Correspondence to Debasis Chakrabarty.

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Handling Editor: Peter Nick

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Shri, M., Rai, A., Verma, P.K. et al. An improved Agrobacterium-mediated transformation of recalcitrant indica rice (Oryza sativa L.) cultivars. Protoplasma 250, 631–636 (2013). https://doi.org/10.1007/s00709-012-0439-x

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  • DOI: https://doi.org/10.1007/s00709-012-0439-x

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