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In vitro shoot regeneration and enhanced synthesis of plumbagin in root callus of Plumbago zeylanica L.—an important medicinal herb

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Abstract

Plumbago zeylanica L., an important medicinal herb, possesses plumbagin, a valuable secondary metabolite. Roots of this plant, collected from four locations in Himachal Pradesh, India, were screened for plumbagin content with high-performance liquid chromatography. The chemotype collected from Hamirpur yielded the highest content (26.47 ± 0.63 mg g−1 dry weight). Callus cultures were established from nodal explants of this chemotype on Murashige and Skoog (MS) medium augmented with α-naphthaleneacetic acid (NAA), indole-3-butyric acid (IBA), 2,4-dichlorophenoxyacetic acid, (2,4-D), 6-benzyladenine (BA), isopentenyl adenine (2iP), or thidiazuron, (TDZ). After 45 d, 98% of the cultures induced bright-green, compact callus on MS + 5 μM TDZ. Upon subculturing, this callus differentiated an average of 4.08 ± 1.16 shoots in 62.5% of the cultures. After elongation on basal MS medium, excised shoots were transferred to indole-3-acetic acid, NAA, or IBA supplemented MS medium. A maximum of 4.3 ± 1.36 roots with an average length of 15.31 ± 2.76 cm were recorded on 5 μM IBA. Rooted plantlets were successfully acclimatized in a greenhouse, and their genetic fidelity was evaluated using inter simple sequence repeats and start codon targeted molecular markers, which revealed 97% similarity. A significant increase in plumbagin content (6.5- and 3.4-fold) was achieved in root callus employing 100 mg L−1 yeast extract (YE) and 25 μM salicylic acid (SA), respectively. This is the first report of large-scale propagation of P. zeylanica and an increase of plumbagin through in vitro root callus.

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Acknowledgments

The authors are grateful to the University of Delhi, India, for providing Research and Development Grant. Prof. VA is thankful to the Science and Engineering Research Board, Government of India, New Delhi, for the sanction of a Major Research Project (SERB/SR/SO/PS/05/2012). US is indebted to University Grants Commission, New Delhi, for the award of JRF and SRF. Financial assistance provided by DST-Purse grant to Department of Botany is gratefully acknowledged.

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Correspondence to Veena Agrawal.

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The authors declare that they have no conflict of interest.

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Editor: Jayasankar Subramanian

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Sharma, U., Agrawal, V. In vitro shoot regeneration and enhanced synthesis of plumbagin in root callus of Plumbago zeylanica L.—an important medicinal herb. In Vitro Cell.Dev.Biol.-Plant 54, 423–435 (2018). https://doi.org/10.1007/s11627-018-9889-y

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  • DOI: https://doi.org/10.1007/s11627-018-9889-y

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