Abstract
Malaxis acuminata is a terrestrial orchid that grows in shady areas of semi-evergreen to shrubby forests. It is highly valued for its medicinal properties as dried pseudo-bulbs are important ingredients of several Ayurvedic preparations. In this study, adventitious shoot buds were induced from internodal explants of M. acuminata grown on Murashige and Skoog (MS) medium supplemented with different concentrations of 6-benzyladenine (BA), kinetin (Kn), and thidiazuron (TDZ). Of the three cytokinins used, TDZ at 3 mg l−1 induced the highest frequency (82%) of organogenic explants. However, all responding explants produced only a single adventitious shoot irrespective of the type and concentration of the cytokinin. Adding 0.5 mg l−1 α naphthaleneacetic acid (NAA) to the medium enhanced adventitious shoot formation. In the presence of 3 mg l−1 TDZ and 0.5 mg l−1 NAA, frequency of organogenesis was 96% with a mean number of 6.1 shoots per explant. Prolonged culture or subculture on the same medium did not promote further shoot production. However, transfer of these cultures to MS medium supplemented with 3 mg l−1 TDZ and 0.5 mg l−1 NAA and various concentrations of different polyamines (PAs), including spermine, spermidine, and putrescine, significantly increased mean shoot number per explant. The highest frequency of shoot induction (100%) and mean shoot number per explant (14.6) was observed on MS medium with 3 mg l−1 TDZ, 0.5 mg l−1 NAA, and 0.4 mM spermidine. Regenerated shoots were excised and subcultured on an elongation medium consisting of MS medium with 3 mg l−1 BA. Moreover, the highest frequency of rooting (96%) and mean number of roots per shoot (3.3) was observed on MS medium with 4 mg l−1 indole-3-butyric acid (IBA) and 1.5 mg l−1 activated charcoal (AC). Almost 90% of rooted shoots were successfully acclimatized and established ex vitro.
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Abbreviations
- AC:
-
Activated charcoal
- BA:
-
6-Benzyladenine
- IBA:
-
Indole-3-butyric acid
- Kn:
-
Kinetin
- MS:
-
Murashige and Skoog
- NAA:
-
α Naphthaleneacetic acid
- PAs:
-
Polyamines
- TDZ:
-
Thidiazuron
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Acknowledgments
We thank the Principal, St. Thomas College, Pala, for providing with necessary laboratory facilities. T.D.T. acknowledges the financial assistance from the Indian National Science Academy (INSA) and the Japan Society for the Promotion of Science (JSPS) in the form of bilateral exchange programme (No. IA/JSPS/2009-2010).
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Cheruvathur, M.K., Abraham, J., Mani, B. et al. Adventitious shoot induction from cultured internodal explants of Malaxis acuminata D. Don, a valuable terrestrial medicinal orchid. Plant Cell Tiss Organ Cult 101, 163–170 (2010). https://doi.org/10.1007/s11240-010-9673-0
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DOI: https://doi.org/10.1007/s11240-010-9673-0