ORCHID PHYTOALEXINS. II. ISOLATION AND CHARACTERIZATION OF POSSIBLE STEROL COMPANIONS
Abstract
Four sterols have been isolated from extracts of Cymbidium pseudobulbs infected with Rhizoctonia repens M 32. One of them, ergosterol peroxide, is most probably an artifact of extraction. The other three, sitosterol, stigmasterol, and campesterol, occur in a 70:25:5 ratio. Appearance of phytoalexin(s) in pseudobulb extracts coincides with increase of sterol production. This raises the question whether Cymbidium phytoalexins are related, biosynthetically or structurally, to sterols. Since the same three sterols occur (free or conjugated) in Cattleya and Arundina, but in different ratios to each other than in Cymbidium, they may be of value in chemotaxonomy.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 1975
- Source ID
- 10.1002/j.1537-2197.1975.tb14107.x
Entities
People
- Axel Ehmann
- Brigitta H. Flick
- Joseph Arditti
- Michael H. Fisch
Organizations
- Michigan State University
- Office of Naval Research
- University of California, Irvine