ISSN:
1573-5044
Keywords:
callus
;
Oncidium
;
shoot bud formation
;
somatic embryogenesis
;
thidiazuron
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Segments taken from flower-stalk internodes of Oncidium Sweet Sugar formed somatic embryos and shoot buds directly from wound surfaces or via nodular masses proliferation within 1.5 months, when cultured on a Gelrite-gelled 1/2-MS basal medium supplemented with thidiazuron (0.1–3 mg l−1) in darkness. In light, when subcultured, these nodular masses proliferated into green compact callus, and produced somatic embryos, shoot buds and/or yellowish abnormal structures spontaneously. Supplementing 0.1–1 mg l−1 NAA enhanced embryo formation, but retarded proliferation of shoot buds and yellowish abnormal structures. Somatic embryos that directly formed from wound surfaces of flower stalk explants usually developed into abnormal structures, but the callus-derived embryos could germinate into PLBs and eventually developed to normal plantlets on a hormone-free basal medium for 3–4 weeks. Both the embryo-and shoot bud-derived regenerants developed into healthly plantlets when potted in sphagnum moss and acclimatized in the greenhouse.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026591003553
