title: Effects of ophiobolin B on cell enlargement and H(+)/K (+) exchange in maize coleoptile tissues.
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.
authors: Centro di Studio del C.N.R. per la Biologia Cellulare e Molecolare delle Piante, Istituto di Scienze Botaniche, Università di Milano, Via Giuseppe Colombo 60, I-20133, Milano, Italy.
authors: L
authors: L
authors: Gianani
authors: S
authors: S
authors: Cocucci
authors: D
authors: D
authors: Pardi
authors: G
authors: G
authors: Randazzo