Abstract
The present investigation describes the in vitro propagation of Plectranthus bourneae via liquid culture system from axillary bud and shoot tip explants. Multiple shoots were initiated from axillary bud and shoot tip explants on Murashige and Skoog (MS) medium supplemented with different concentrations (0.1–2.0 mg/l) and combinations of cytokinins [BA (6-benzyladenine), KN (kinetin), and TDZ (thidizauron)] along with (0.5–2.0 mg/l) auxins [NAA (α-naphthalene acetic acid), IAA (indole-3 acetic acid), IBA (indole-3-butyric acid)]. Maximum shoot multiplication (12.14) was achieved from axillary bud explant followed by shoot tip explant (8.85) at 0.5 mg/l TDZ with 1.0 mg/l NAA. A maximum of 9.71 roots/shoot was observed at 0.7 mg/l IBA. The rooted plantlets successfully hardened and transferred to greenhouse condition with 83% survival. Inter-simple sequence repeat markers exhibited genetic fidelity with 100% monomorphism in regenerants. The authenticated protocol supports rapid production of true-to-type plants by liquid culture in vitro and therefore could supply a valuable target material for genetic transformation study.
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Acknowledgements
The authors express their sincere thanks to the University Grants Commission, New Delhi for financial support in the form of major research project (UGC REF. NO. 40-325/2011(SR) dated 30.06.2011), and Mr. R. W. Stewart and Mrs. Tanya Balcar of Vattakanal Conservation Trust, Kodaikanal, Tamil Nadu, India for the help rendered during the field survey. One of the authors (M. V. Rao) also thank the UGC for providing Emeritus fellowship.
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Thaniarasu, R., Senthil Kumar, T. & Rao, M.V. Rapid in vitro propagation by liquid culture system and genetic homogeneity assessment of Plectranthus bourneae Gamble, an endemic plant species to South India. Ind J Plant Physiol. 23, 376–384 (2018). https://doi.org/10.1007/s40502-018-0369-5
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DOI: https://doi.org/10.1007/s40502-018-0369-5