1. Effects of ophiobolin B on cell enlargement and H+/K+ exchange in maize coleoptile tissues
- Author
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Giacomino Randazzo, Daniela Pardi, Luciana Gianani, and Sergio M. Cocucci
- Subjects
biology ,Toxin ,Stereochemistry ,Cell Enlargement ,Metabolite ,Biological activity ,Plant Science ,medicine.disease_cause ,biology.organism_classification ,Terpenoid ,chemistry.chemical_compound ,Coleoptile ,Biochemistry ,chemistry ,Fusicoccin ,Genetics ,medicine ,Fusicoccum amygdali - Abstract
Ophiobolin B (OPH B), a sesterpene metabolite of Helminthosporium oryzae, inhibits proton extrusion from maize coleoptiles. Moreover OPH B counteracts the biological activity of fusicoccin (FC), another terpenoid toxin produced by Fusicoccum amygdali having a similar basic chemical structure: OPH B inhibits FC-promoted proton extrusion, potassium uptake and cell enlargement. The findings suggest that the effect of OPH B in stimulating electrolites, glucose and aminoacid leakage, reported in a previous paper, can be explained by the capacity of the toxin to inhibit proton extrusion.
- Published
- 1979
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