Efficient shoot formation on internodal segments and alkaloid formation in the regenerates of Cephaelis ipecacuanha A. Richard |
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Authors: | Kayo Yoshimatsu Koichiro Shimomura |
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Institution: | (1) Tsukuba Medicinal Plant Research Station, National Institute of Hygienic Sciences, 1 Hachimandai, Tsukuba, 305 Ibaraki, Japan |
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Abstract: | Rapid shoot proliferation was established by adventitious shoot formation on internodal segments. Cross sections of the shoot initiation area were observed microscopically and adventitious shoots were studied under the scanning electron microscope. Shoots were directly formed on the epidermis of internodal segments in vitro without callusing, but not on that of nodal segments with axillary buds. The use of media containing 0.01 – 0.1 mg/l 6-benzyladenine or 0.1 mg /l kinetin and culture under 16 h light increased the number of shoots per segment. The shoots thus obtained were rooted on phytohormone-free Woody Plant or Gamborg B5 solid medium, and were then transferred to soil. When potted, these grew well in a greenhouse. The emetic alkaloid content of adventitious shoots and regenerated plants was determined by HPLC. In vitro shoots cultured in Woody Plant liquid medium supplemented with 0.01 – 0.1 mg/l 6-benzyladenine contained 0.04 – 0.07 % dry wt. emetine and 0.4 – 0.5 % dry wt. cephaeline. One-year old regenerated plants cultivated in a greenhouse demonstrated the same alkaloid content (roots contained 0.82 % dry wt. emetine and 2.16 % dry wt. cephaeline) as the parental plant.Abbreviations MS
Murashige — Skoog (Murashige and Skoog 1962)
- 1/2 MS
half strength MS
- B5
Gamborg B5 (Gamborg et al. 1968)]
- WP
woody plant (Lloyd and McCown 1980)
- RC
root culture (Thomas and Davey 1982)
- HF
phytohormone free
- BA
6-benzyladenine
- Kin
kinetin
- SEM
scanning electron microscopy
- RDF
rotating drum fermenter |
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Keywords: | |
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