Abstract
We have used apical meristem culture to develop an efficient protocol for reducing phytoplasma infection of Artemisia roxburghiana Besser var. purpurascens (Jacq.) Hook. plants. Shoot tips of different sizes from phytoplasma-infected field-grown plants were treated with 0.1% mercuric chloride (HgCl2) for 1 min followed by a 30-s exposure to 70% ethanol. The size of the explants significantly influenced the survival frequency and the success of aseptic culture establishment. Sterile explants responded notably to 13.95 μM Kinetin (Kn) and 0.27 μM α-naphthalene acetic acid (NAA), and a maximum of 38 ± 0.87 shoots per explant could be obtained after 6 weeks of incubation. Sub-culturing of the shoot mass after 8 weeks of culture on the previously described medium to 8.88 μM 6-benzyladenine (BA)- and 0.27 μM NAA-containing medium stimulated further multiplication, elongation and growth of each individual regenerant. Efficient rooting was noted after 5 weeks of transfer on half-strength MS medium containing 4.93 μM IBA. Sequential hardening as hydroponic cultures under culture room and glasshouse conditions led to almost 85 and 98% survival of the regenerants upon transfer to pots and field, respectively. Unlike the original A. roxburghiana plants, the plants raised from tissue culture showed a total absence of inherent phytoplasma infection evaluated via inspection of morphological features, PCR and microscopic observations.
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Abbreviations
- BA:
-
6-benzyladenine
- CTAB:
-
Cetyltrimethylammonium bromide
- EDTA:
-
Ethylene diamine tetra acetic acid
- IBA:
-
Indole-3-butyric acid
- Kn:
-
Kinetin
- MgCl2 :
-
Magnesium chloride
- MS:
-
Murashige-Skoog medium
- MQ water:
-
Milli-Q water
- NAA:
-
α-naphthalene acetic acid
- NaCl:
-
Sodium chloride
- PCR:
-
Polymerase chain reaction
- PVP:
-
Polyvinylpyrrolidone
- TDZ:
-
Thidiazuron [N-phenyl-Ń -(1,2,3-thidiazol-5-yl) urea]
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The authors are grateful to the Director, CIMAP (CSIR), Lucknow for providing the research facilities. Sincere thanks are also due to the members of the Photography Division for their co-operation and support.
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Banerjee, S., Haider, F., Bagchi, G.D. et al. Regeneration of phytoplasma-free Artemisia roxburghiana Besser var. purpurascens (Jacq.) Hook. plants using apical meristem culture. Plant Cell Tiss Organ Cult 103, 189–196 (2010). https://doi.org/10.1007/s11240-010-9766-9
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DOI: https://doi.org/10.1007/s11240-010-9766-9