Abstract
The effect of thidiazuron (TDZ) on direct multiple shoot induction in axenic seedlings of a monopodial orchid hybrid Aerides vandarum × Vanda stangeana, using a dual phase culture medium was studied. The culture system consisted of a basal agar solidified half-strength Murashige and Skoog medium overlaid by a liquid fraction of the same composition. Highest regeneration of multiple shoots (15.8 shoots per seedling) was obtained in the medium containing 2% sucrose (w/v) supplemented with 2 mgl−1 TDZ. Genetic stability of the regenerated shoots was assessed using random amplified polymorphic DNA (RAPD), inter simple sequence repeat (ISSR), and restriction fragment length polymorphism of the PCR amplified (PCR-RFLP) nrITS region, as well as those of the coding (matK) and non-coding (trnL-F) regions of the cpDNA. Across the randomly selected mother plant and nine of its regenerated shoots, 2,680 bands were generated by 19 RAPD and 12 ISSR primers, exhibiting monomorphic banding profiles. Homogenous PCR-RFLP profiles were generated for nrITS using four restriction enzymes (REs), matK using five REs, and trnL-F using six REs. These molecular analyses showed no genomic alterations in all regenerated shoots obtained on medium containing 2 mgl−1 TDZ.
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Abbreviations
- Av:
-
Aerides vandarum
- BA:
-
N6-benzyladenine
- cpDNA:
-
Chloroplast DNA
- ISSR:
-
Inter simple sequence repeat
- NAA:
-
α-Naphthalene acetic acid
- MS:
-
Murashige and Skoog medium
- nrITS:
-
Nuclear ribosomal internal transcribed spacer
- PCR:
-
Polymerase chain reaction
- PGRs:
-
Plant growth regulators
- RAPD:
-
Random amplified polymorphic DNA
- REs:
-
Restriction enzymes
- RFLP:
-
Restriction fragment length polymorphism
- TDZ:
-
Thidiazuron
- Vs:
-
Vanda stangeana
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Acknowledgments
This research was supported by the Department of Biotechnology, Government of India, in the form of a Post-doctoral fellowship to Rajkumar Kishor. The authors wish to thank Director, IBSD, Imphal, India for extending the research facilities and critically reading the manuscript.
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Kishor, R., Devi, H.S. Induction of multiple shoots in a monopodial orchid hybrid (Aerides vandarum Reichb.f × Vanda stangeana Reichb.f) using thidiazuron and analysis of their genetic stability. Plant Cell Tiss Organ Cult 97, 121–129 (2009). https://doi.org/10.1007/s11240-009-9506-1
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DOI: https://doi.org/10.1007/s11240-009-9506-1