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Molecular and chemical characterization of plants regenerated from Ri-mediated hairy root cultures of Rauwolfia serpentina

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Abstract

Hairy root lines were induced from leaf explants of Rauwolfia serpentina known to contain high levels of reserpine (0.0882 % DW) content. Out of five high yielding hairy root lines, three (R1, R14 and R15) exhibited spontaneous regeneration of shoots after 6–8 weeks in liquid B5 medium. Excised regenerated shoots underwent robust shoot proliferation when cultured on Murashige and Skoog (MS) medium supplemented with 0.1 mg/l naphthanleneacetic acid (NAA) and 1.0 mg/l 6-benzyladenine. When shoots were transferred to a root induction medium, consisting of MS basal medium and 1.0 mg/l NAA, all rooted within 2–3 weeks. Of a total of 45 plants developed from three different hairy root lines, 30 were successfully acclimatized and transferred to the green house. Almost 90 % of these plants grown in the green house showed no observed phenotypic differences, while 10 % were stunted and grew poorly, in comparison to non-transformed plants. Phenotypic assessment of regenerated plants for plant length, number of nodes and intermodal lengths, number of leaves per node, leaf color, leaf size, number of flowering shoots, flower size, fruit size, lateral root branching and root biomass was conducted. Polymerase chain reaction and Southern blot hybridization revealed that all plants derived from hairy roots carried the Ri TL-DNA fragment. Moreover for plants derived from transgenic hairy root line R14, presence of more than a single transgene copy number was observed, and this might have contributed to observed abnormal phenotypes. Analysis of reserpine content revealed that roots of regenerated plants had similar levels (0.0889 % DW) to those of their corresponding hairy roots.

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Acknowledgments

Authors are grateful to Director, CIMAP (CSIR) for providing the necessary facilities to carry out work. Post Doctoral Fellowship provided by Department of Science and Technology (DST), Govt. of India to SM is duly acknowledged. Thanks are also due to Dr. K. Shankar for chemical analysis of root samples.

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  1. Manoj K. Goel

    Present address: BioSeed Research India Limited, ICRISAT, Patancheru, Hyderabad, 502324, India

Authors and Affiliations

  1. Plant Biotechnology Division, Central Institute of Medicinal and Aromatic Plants, P.O. CIMAP, Picnic spot Road, Lucknow, 226015, India

    Shakti Mehrotra, Manoj K. Goel, Laiq Ur Rahman & A. K. Kukreja

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  1. Shakti Mehrotra
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Correspondence to Shakti Mehrotra.

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Mehrotra, S., Goel, M.K., Rahman, L.U. et al. Molecular and chemical characterization of plants regenerated from Ri-mediated hairy root cultures of Rauwolfia serpentina . Plant Cell Tiss Organ Cult 114, 31–38 (2013). https://doi.org/10.1007/s11240-013-0302-6

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