THE INTERACTION OF KINETIN, AUXIN AND OTHER FACTORS IN THE DEVELOPMENT OF NORTH TEMPERATE ORCHIDS
Article first published online: 3 SEP 2012
1970 The New Phytologist
Volume 69, Issue 2, pages 549–555, April 1970
How to Cite
HADLEY, G. (1970), THE INTERACTION OF KINETIN, AUXIN AND OTHER FACTORS IN THE DEVELOPMENT OF NORTH TEMPERATE ORCHIDS. New Phytologist, 69: 549–555. doi: 10.1111/j.1469-8137.1970.tb07607.x
- Issue published online: 3 SEP 2012
- Article first published online: 3 SEP 2012
- Received 15 December 1969
Concentrations (w/v) of 1–10 ppm kinetin, with or without 1 ppm indoleacetic acid, may retard the germination of Dactylorhiza (Orchis) purpurella seed but increase the rate of growth of protocorms to the point where shoot initials form. Subsequently diurnal illumination enhances the development of the shoot initial. Chlorophyll production is independent of growth factors and occurs most rapidly at temperatures below 15°C. Green shoot-initials undergo further development only after prolonged cold treatment and this stage appear to be independent of growth factors or symbiotic fungi. Similar results were obtained with Coeloglossum viride and Platanthera bifolia.
Goodyera repens, an evergreen rhizomatous species, did not respond to mixtures of kinetin and indoleacetic acid, or coconut milk, but grew well on potato or yeast extracts, or after infection with symbiotic fungi.
Symbiotic development of north temperate orchids occurs on defined media lacking growth factors and is always more rapid than that in any axenic system so far tested.