Abstract
The cis- but not the trans-isomers of the natural inhibitors, methyl ferulate and methyl 3,4-dimethoxycinnamate, inhibit germination of the uredospores of wheat-stem rust. Minimum concentrations for 50% inhibition are about 7 and 140 nM, respectively. Ultraviolet radiation activates the trans-isomers by partial conversion to the cis-forms, and partially inactivates the cis-form by the reverse transformation. About 100 molecules of the germination stimulant, n-nonyl alcohol, are required per molecule of methyl cis-ferulate to overcome inhibition and restore 50% germination. Seasonal and age differences in sensitivity of spores to inhibitor may be related to variations in content of stimulant.
Keywords: methyl cis-ferulate; methyl 3,4-dimethoxycinnamate; Puccinia graminis var. tritici; ultraviolet
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Macko V., Staples R. C., Allen P. J., Renwick J. A. Identification of the germination self-inhibitor from wheat stem rust uredospores. Science. 1971 Aug 27;173(3999):835–836. doi: 10.1126/science.173.3999.835. [DOI] [PubMed] [Google Scholar]
- Macko V., Staples R. C., Gershon H., Renwick J. A. Self-inhibitor of bean rust uredospores: methyl 3,4-dimethoxycinnamate. Science. 1970 Oct 30;170(3957):539–540. doi: 10.1126/science.170.3957.539. [DOI] [PubMed] [Google Scholar]