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.
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Abbreviations
- FC:
-
fusicoccin
- OPH B:
-
ophiobolin B
References
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Gianani, L., Cocucci, S., Pardi, D. et al. Effects of ophiobolin B on cell enlargement and H+/K+ exchange in maize coleoptile tissues. Planta 146, 271–274 (1979). https://doi.org/10.1007/BF00387797
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DOI: https://doi.org/10.1007/BF00387797