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

Though Helminthosporium maydis race T (HmT) toxin decreased active Ca2+ 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 Ca2+ ionopho...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1984-05, Vol.75 (1), p.235-237
Main Authors: Marcia J. Holden, Sze, Heven
Format: Article
Language:English
Subjects:
Corn
Ethanol
Helminthosporium
Hydrolysis
Mitochondria
Mitochondrial membranes
Oxidation
Plants
Protons
Short Communications
Toxins
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Summary:Though Helminthosporium maydis race T (HmT) toxin decreased active Ca2+ 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 Ca2+ ionophore) dissipated a Ca2+ gradient in T mitochondria. However, HmT toxin had no effect on Ca2+ gradients in N mitochondria or microsomal vesicles from T or N corn. The results suggest that HmT toxin increased membrane permeability to Ca2+ in mitochondria of T corn specifically.
ISSN:0032-0889
1532-2548