Abstract
Opium poppy (Papaver somniferum) remains the most important source for several pharmaceutical benzylisoquinoline alkaloids including the narcotic analgesic morphine, the anti-tussive drug codeine. Selection, breeding as well as other molecular practices have produced large number of germplasm with modulated biosynthesis and altered accumulation of specific alkaloids. However, there is need to modulate biosynthetic pathways of these alkaloids through transgenic approach, which requires development of an efficient regeneration system for genetic transformation. We studied response of different explants for somatic embryogenesis and developed an efficient protocol for P. somniferum somatic embryogenesis, regeneration as well as successful transplantation in fields. In our system, embryogenic callus from root explants was induced by 2,4-D and kinetin followed by maturation with gibberellin and abscisic acid and regeneration by hormone free half-strength MS media. Though root regeneration from somatic embryos has been shown as limiting factor in established protocols, we observed efficient root and shoot regeneration through somatic embryos in our study. We analyzed alkaloid content in in vitro callus and field grown plants and concluded developmental control of alkaloid biosynthesis. Absence of transcripts of some of the genes and specific alkaloids also suggests regulation at transcriptional level of alkaloid biosynthesis pathway.
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Abbreviations
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- ABA:
-
Abscisic acid
- GA:
-
Gibberellic acid
- MI:
-
Mesoinositol
- kn:
-
Kinetin
- PGR:
-
Plant growth regulators
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Acknowledgments
The authors are thankful to the Council of Scientific and Industrial Research, New Delhi, Govt. of India, for providing the financial support to carry out this work under Network Project (NWP-08). Financial support from Department of Revenue, Ministry of Finance, New Delhi is also acknowledged. SP and BKM acknowledge Council of Scientific and Industrial Research, New Delhi, Govt. of India for Senior Research Fellowship.
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10725_2012_9689_MOESM1_ESM.ppt
Representative chromatogram of different standards and extract of plant opium latex. M, C, T, N, and P represents morphine, codeine, thebaine, norcotine and papaverine respectively. (PPT 120 kb)
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Pathak, S., Mishra, B.K., Misra, P. et al. High frequency somatic embryogenesis, regeneration and correlation of alkaloid biosynthesis with gene expression in Papaver somniferum . Plant Growth Regul 68, 17–25 (2012). https://doi.org/10.1007/s10725-012-9689-z
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DOI: https://doi.org/10.1007/s10725-012-9689-z