Plant Physiol.
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Plant Physiology 46:227-232 (1970)
© 1970 American Society of Plant Biologists

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Articles

Specificity of Cycloheximide in Higher Plant Systems

R. J. Ellis1 and I. R. MacDonald

a Department of Biochemistry, University of Aberdeen, and Department of Plant Physiology, The Macaulay Institute for Soil Research, Aberdeen, Scotland

Although cycloheximide is extremely inhibitory to protein synthesis in vivo in higher plants, the reported insensitivity of some plant ribosomes suggests that it may not invariably act at the ribosomal level. This suggestion is reinforced by results obtained with red beet storage tissue disks, the respiration of which is stimulated by cycloheximide at 1 microgram per milliliter. Inorganic ion uptake by these disks is inhibited by cycloheximide at 1 microgram per milliliter while the uptake of organic compounds, by comparison, is unaffected. Ion uptake by all nongreen tissues tested is inhibited by cycloheximide, but leaf tissue is unaffected, indicating that the ion absorption mechanism in the leaf may differ fundamentally from that in the root. It is concluded that cycloheximide can affect cellular metabolism other than by inhibiting protein synthesis and that the inhibition of ion uptake may be due to disruption of the energy supply.

1 Present address: Division of Biological Sciences, University of Warwick, Coventry, England.






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Copyright © 1970 by the American Society of Plant Biologists