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Specificity of the cis-Isomers of Inhibitors of Uredospore Germination in the Rust Fungi

, : Specificity of the cis-Isomers of Inhibitors of Uredospore Germination in the Rust Fungi. Proceedings of the National Academy of Sciences of the United States of America 69(12): 3497-3500

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.

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Accession: 017105121

PMID: 16592034

DOI: 10.2307/62019

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Related references

Allen, P.J., 1972: Specificity of the cis isomers of inhibitors of uredio spore germination in the rust fungi. Proceedings of the National Academy of Sciences of the United States of America 69(12): 3497-3500

Talieva, Mme M.N., 1961: On the physiology of uredospore germination in rust fungi. Germinating uredospores of Puccinia triticina from wheat-grass hybrid 56 and P. suaveolens from Cirsium arvense at the Central bot. Gdn, Moscow, contained specific antibiotics, which were not toxic to higher plants or to themselves, but depressed...

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