Abstract
Paphiopedilum orchids are among the world’s most popular orchid due to their impressively beautiful flowers. Propagation of these orchid genera has been hampered by the naturally slow growth rate of the plant, which renders it very difficult to be propagated through conventional methods. In vitro culture techniques have provided a useful alternative technology for propagating this recalcitrant species. In this study, the propagation of P. rothschildianum was achieved through the in vitro formation of secondary protocorm-like bodies (PLBs) from the primary PLB that developed from stem-derived callus. The PLBs were cultured on half-strength MS medium supplemented with different concentrations (1.0, 2.0, 3.0, and 4.0 μM) of 6-benzyladenine (BA) and kinetin for the induction of secondary PLBs. The highest number of secondary PLBs formed was obtained on half-strength MS medium supplemented with 4.0 μM kinetin, with an average of 4.1 PLBs per explant after 8 weeks of culture. The secondary PLBs continued to proliferate further and formed 9.5–12.1 new PLBs per secondary PLB after being subcultured onto half-strength plant growth regulator-free MS medium supplemented with 60 g/L banana homogenate (BH). These tertiary PLBs were subcultured onto media containing different organic additives, such as BH, coconut water, potato homogenate, and tomato homogenate, for plantlet regeneration. Among the organic additives tested, the addition of 20% CW to half-strength MS medium resulted in the best average plantlet regeneration percentage from the PLBs, 67.9%, after 8 weeks of culture.
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Abbreviations
- BA:
-
6-Benzyladenine
- BH:
-
Banana homogenate
- CW:
-
Coconut water
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- NAA:
-
1-Naphthaleneacetic acid
- PGR:
-
Plant growth regulator
- PH:
-
Potato homogenate
- PLB:
-
Protocorm-like body
- TDZ:
-
Thidiazuron
- TH:
-
Tomato homogenate
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The authors thank the School of Graduate Studies of University Putra Malaysia for providing a Graduate Research Fellowship to the first author.
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Ng, CY., Saleh, N.M. In vitro propagation of Paphiopedilum orchid through formation of protocorm-like bodies. Plant Cell Tiss Organ Cult 105, 193–202 (2011). https://doi.org/10.1007/s11240-010-9851-0
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DOI: https://doi.org/10.1007/s11240-010-9851-0