Abstract
Podophyllum hexandrum Royle known as Indian mayapple is an important medicinal plant found only in higher altitudes (2,700 to 4,200 m) of the Himalayas. The highly valued anticancer drug Podophyllotoxin is obtained from the roots of this plant. Due to over exploitation, this endemic plant species is on the verge of extinction. In vitro culture for efficient regeneration and the production of podophyllotoxin is an important research priority for this plant. Hence, in the present study, an efficient plant regeneration system for mass multiplication through somatic embryogenesis was developed. We have screened P. hexandrum seeds collected from three different regions in the Himalayas to find their regenerative potentials. These variants showed variation in germination percentage as well as somatic embryogenic frequency. The seeds collected from the Milam area of Pithoragarh district showed better germination response (99.3 %) on Murashige and Skoog (MS) medium fortified with Gibberellic acid (GA3 [5 mg/l]) and higher direct somatic embryogenic frequency (89.6 %). Maximum production of embryogenic callus (1.2 g fresh weight [FW]) was obtained when cotyledons containing the direct somatic embryo clusters were cultured in MS medium supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D [1.5 mg/l]) after 4 week of culture in complete darkness. In the present investigation, somatic embryogenesis was accomplished either by direct organogenesis or callus mediated pathways. The latter method resulted in a higher frequency of somatic embryo induction in hormone-free MS medium yielding 47.7 embryos/50 mg of embryogenic callus and subsequent germination in MS medium supplemented with GA3 (5 mg/l). Seventy-nine percent of embryos attained complete maturity and germinated into normal plants with well-developed roots. Systematic histological analysis revealed the origin of somatic embryo and their ontogenesis. The higher level of podophyllotoxin (1.8 mg/g dry weight [DW]) was recorded in germinated somatic embryos when compared to field grown plants. The present system can be widely used for mass propagation, transgenic recovery, and podophyllotoxin production for commercial utilization.
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Abbreviations
- 2,4-D:
-
2,4-dichlorophenoxy acetic acid
- ABA:
-
Abscisic acid
- DSE:
-
Direct somatic embryo
- GA3 :
-
Gibberellic acid
- HPLC:
-
High performance liquid chromatography
- IAA:
-
Indole-3-acetic acid
- IBA:
-
Indole-3-butyric acid
- MS:
-
Murashige and Skoog medium
- NAA:
-
Naphthaleneacetic acid
- PGR:
-
Plant growth regulators
- PTOX:
-
Podophyllotoxin
- RT:
-
Retention time
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Acknowledgments
The authors are thankful to the Life Science Research Board, Defence Research and Development Organisation (DRDO), Govt. of India for financial support (DLS/81/48222/LSRB–171 BTB/2008) used to carry out the present work. The corresponding author is thankful to the University Grants Commission (UGC), Govt. of India, for providing an emeritus fellowship under the BSR scheme. The first author is thankful to Prof. S.K. Nandi, G.B. Pant Institute of Himalayan Environment and Development, Almora, Uttarakhand, India, Prof. M.C. Nautiyal, H.N.B. Garhwal University, Garhwal Srinagar, Uttarakhand, India, and Dr. Lokho Puni IFS, Forest Research Institute, Dehradun, Uttaranchal for help with the collection of seeds at different locations. The first author is thankful to Dr. V. Nandhagopal, National College, Trichy, for his critical guidance in histology work. The authors are thankful to Dr. R. Boopathy, Head of the Department and Dr. S. Girija, Associate Professor, Department of Biotechnology, Bharathiar University, Coimbatore for providing HPLC facility.
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Rajesh, M., Sivanandhan, G., Jeyaraj, M. et al. An efficient in vitro system for somatic embryogenesis and podophyllotoxin production in Podophyllum hexandrum Royle. Protoplasma 251, 1231–1243 (2014). https://doi.org/10.1007/s00709-014-0632-1
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DOI: https://doi.org/10.1007/s00709-014-0632-1