Helminthosporium maydis T Toxin Increased Membrane Permeability to Ca2+ in Susceptible Corn Mitochondria | Zendy

Marcia J. Holden | Zendy; Heven Sze | Zendy

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Helminthosporium maydis T Toxin Increased Membrane Permeability to Ca²⁺ in Susceptible Corn Mitochondria

Author(s) -

Marcia J. Holden,

Heven Sze

Publication year - 1984

Publication title -

plant physiology

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.75.1.235

Subject(s) - toxin , mitochondrion , microsome , permeability (electromagnetism) , biology , ionophore , chemistry , microbiology and biotechnology , biochemistry , membrane , in vitro

Though Helminthosporium maydis race T (HmT) toxin decreased active Ca(2+) uptake into mitochondria isolated from susceptible (T) but not resistant (N) corn (Kimber, Sze, 1984 Plant Physiol 74: 804-809 the mode of toxin action is not understood. This study shows that HmT toxin or A23187 (a Ca(2+) ionophore) dissipated a Ca(2+) gradient in T mitochondria. However, HmT toxin had no effect on Ca(2+) gradients in N mitochondria or microsomal vesicles from T or N corn. The results suggest that HmT toxin increased membrane permeability to Ca(2+) in mitochondria of T corn specifically.

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