Plant Physiol.
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Plant Physiology 43:1673-1688 (1968)
© 1968 American Society of Plant Biologists

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Articles

Biological Activity of a Phytotoxic Glycopeptide Produced by Corynebacterium sepedonicum 1

Gary A. Strobel

W. M. Hess

Department of Botany and Microbiology, Montana State University, Bozeman, Montana 59715, Department of Botany, Brigham Young University, Provo, Utah 84601

A purified toxic glycopeptide from Corynebacterium sepedonicum (Speick.) Dows., possesses the capacity to wilt plant cuttings. The toxin induces a rapid general flaccidity in stem tissues followed by a leaf wilt making its effects significantly different from that induced by high molecular weight substances (dextrans). In the latter case, the initial effect of a dextran induced wilt is a leaf wilt presumably caused by the plugging of xylem elements. However, physiological experiments including dye transport studies, plasmolytic studies, measurements on electrolytes, studies on the movement of 3H2O through tomato cuttings, and toxin binding studies all strongly suggest that the primary effect of the toxin is to destroy the integrity of cellular membranes resulting in the net loss of water from the cell. Membrane damage in toxin treated plants was confirmed by electron microscopic observations. Evidence of damage were seen in chloroplasts, mitochondria, the plasma membrane, and the structural integrity of the cell wall. These effects appeared to be a direct cause and not a secondary result of the toxin as shown by autoradiographic studies using 3H-toxin.

1 Supported in part by NSF grants GB-5557 to G. A. Strobel and GE-7002 to W. M. Hess. Montana Agricultural Experiment Station Paper No. 908, Journal Series.






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Copyright © 1968 by the American Society of Plant Biologists