Abstract
Withania somnifera Dunal is an important and extensively studied medicinal plant; however, there is no report available that relates withanolide content and its profile in relation to the expression of pathway genes during different morphogenic stages. In this study, withanolide A, withaferin A, and withanone, the major withanolides of W. somnifera, were measured in different in vitro stages during organogenesis, viz., shoot to root (direct rhizogenesis)/root to shoot (indirect via callus phase) transition vis-à-vis expression levels of key pathway genes involved in withanolide biosynthetic pathways. The morphogenic transitions were found to be tightly linked to the pattern of accumulation of withanolides. The high expression levels of most of the pathway genes in in vitro shoots in comparison to in vitro root and callus tissues exhibited a direct co-relation with the maximum withanolide content (>2.7 mg/gDW). The biogenesis of withaferin A, a major constituent of the leaves, was however found to be tightly linked to shoots/green tissue. In addition, we were also able to establish an efficient regeneration system from roots for their further utilization in biotechnological applications.
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Abbreviations
- IAA:
-
Indole-3-acetic acid
- IBA:
-
Indole-3-butyric acid
- NAA:
-
α-Naphthalene acetic acid
- 2, 4-D:
-
2,4-Dichlorophenoxy acetic acid
- TDZ:
-
Thidiazuran
- HPLC:
-
High-performance liquid chromatography
- DW:
-
Dry weight
- FW:
-
Fresh weight
- MS:
-
Murashige and Skoog (1962)
- HMGR:
-
Hydroxymethylglutaryl Co-A reductase
- FPPS:
-
Farnesyldiphosphate synthase
- SS:
-
Squalene synthase
- SE:
-
Squalene epoxidase
- CAS:
-
Cycloartenol synthase
- GT:
-
Glucosyl transferase
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Acknowledgments
The financial grant under NMITLI Program of Council of Scientific and Industrial Research, Government of India, New Delhi, is gratefully acknowledged. FS is thankful to CSIR for the award of senior research fellowship.
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Sabir, F., Mishra, S., Sangwan, R.S. et al. Qualitative and quantitative variations in withanolides and expression of some pathway genes during different stages of morphogenesis in Withania somnifera Dunal. Protoplasma 250, 539–549 (2013). https://doi.org/10.1007/s00709-012-0438-y
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DOI: https://doi.org/10.1007/s00709-012-0438-y