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Plant Physiology 77:912-916 (1985)
© 1985 American Society of Plant Biologists

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Articles

Mode of Methomyl and Bipolaris maydis (race T) Toxin in Uncoupling Texas Male-Sterile Cytoplasm Corn Mitochondria 1

Robert R. Klein2 and David E. Koeppe3

Department of Agronomy, University of Illinois, Urbana, Illinois 61801

Bipolaris maydis race T toxin (BmT), and its functional analog, methomyl, uncoupled Texas male-sterile (T) cytoplasm mitochondria by decreasing the resistance of the inner membrane to protons. However, unlike protonophoric or ionophoric agents, BmT toxin and methomyl induced irreversible swelling. Packed volume measurements showed that mitochondrial volume was irreversibly increased by methomyl and BmT toxin indicating that mitochondria no longer functioned as differentially permeable osmometers. The decreased resistance of inner mitochondrial membranes to protons and the loss of osmotic volume regulation suggests that methomyl and BmT toxin induced the formation of hydrophilic pores in T mitochondrial inner membranes.

2 Present address: Department of Biochemistry and Biophysics, Texas A & M University, College Station, TX 77843.

3 Permanent address: Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409.

1 Supported by funds from the Illinois Agriculture Experiment Station, Urbana.




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Copyright © 1985 by the American Society of Plant Biologists