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Agrobacterium tumefaciens-mediated genetic transformation of Digitalis purpurea L.

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Abstract

Genetic transformation is a tool of special interest for developing new biotechnological strategies for the production of bio-active compounds such as cardenolides, which are exclusively obtained from plants. To date, Digitalis plants are the main economically viable source of cardenolides for the pharmaceutical industry. This study describes the development of efficient plant regeneration and Agrobacterium-mediated genetic transformation protocols for Digitalis purpurea L. First, a plant regeneration procedure starting from leaf segments of in vitro-cultivated plants was established and the minimal inhibitory concentration of G-418 (geneticin) for callus induction was determined. Both leaf segments and callus tissue were sensitive to G-418 70 mg l−1. Afterwards, two Agrobacterium strains were used to test their T-DNA transfer ability on D. purpurea leaf tissues, EHA105 and C58C1RifR (pMP90), both harboring the binary vector pTJK136. Strain C58C1RifR (pMP90) yielded a higher number of transformed plants than EHA105. Successful transformation was confirmed by histochemical β-glucuronidase (GUS) assays of the putative transgenic tissues and PCR analyses using β-glucuronidase (uidA)- and neomycin phosphotransferase II (nptII)-specific primers. Southern blot hybridization confirmed the stable integration of the nptII gene in the transgenic plants. In total, 518 independent transgenic lines were regenerated with an average of 6.91 transgenic lines per initial leaf segment infected with A. tumefaciens strain C58C1RifR (pMP90). To date, only a few studies have been published on the genetic transformation of Digitalis species. The protocols for plant regeneration and genetic transformation described in this paper will contribute to functional studies for a better understanding of cardenolide biosynthetic pathways and the metabolic engineering of cardenolides to develop high-yielding improved genotypes.

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Acknowledgments

The authors thank the support of the EU through the ALFA Network CARIBIOTEC (project AML/B7-311/97/0666/II-0201) and the Institutional University Collaboration programme with Universidad Central “Marta Abreu” de Las Villas funded by the Flemish Interuniversity Council (VLIR-IUC UCLV).

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  1. Yovanny Izquierdo

    Present address: Centro Nacional de Biotecnología, Calle Darwin 3, Campus de Cantoblanco, 28049, Madrid, Spain

Authors and Affiliations

  1. Instituto de Biotecnología de las Plantas, Universidad Central “Marta Abreu” de Las Villas, Carretera a Camajuaní km 5,5, CP 54830, Santa Clara, Villa Clara, Cuba

    Naivy Pérez-Alonso, Borys Chong-Pérez, Alina Capote, Anabel Pérez & Yovanny Izquierdo

  2. Institute for Molecular Biology and Biotechnology, Vrije Universiteit Brussel, 1050, Brussels, Belgium

    Borys Chong-Pérez & Geert Angenon

  3. Tropical Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, 18905 SW 280th Street, Homestead, FL, 33031, USA

    Elio Jiménez

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  1. Naivy Pérez-Alonso
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  2. Borys Chong-Pérez
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  3. Alina Capote
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Correspondence to Elio Jiménez.

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N. Pérez-Alonso and B. Chong-Pérez contributed equally to the manuscript.

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Pérez-Alonso, N., Chong-Pérez, B., Capote, A. et al. Agrobacterium tumefaciens-mediated genetic transformation of Digitalis purpurea L.. Plant Biotechnol Rep 8, 387–397 (2014). https://doi.org/10.1007/s11816-014-0329-0

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