Plant Physiol.
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Plant Physiology 86:895-898 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Increased Chorismate Mutase Levels as a Response to Wounding in Solanum tuberosum L. Tubers 1

Gary Kuroki and Eric E. Conn

Department of Biochemistry and Biophysics, University of California, Davis, California 95616

Discs excised from Solanum tuberosum L. cv White Rose tubers demonstrated a 4.5-fold increase in chorismate mutase activity 48 hours after excision. Incubation in the presence of cycloheximide (25 micromolar) or actinomycin D (100 micromolar) completely inhibited the wound response suggesting de novo synthesis of chorismate mutase. Ratios of activity in the presence of the activator tryptophan to that in the absence of tryptophan remained relatively constant during the induction period. This indicated either a constant ratio of tryptophan sensitive to tryptophan insensitive isozymes, or that only one form of chorismate mutase was present. Chromatography of crude extracts on three different columns yielded only one peak of chorismate mutase activity, activated by tryptophan in each case. Incubation under white light had no effect on chorismate mutase activity when compared to dark controls.

1 Supported in part by United States Public Health Service GM-05301-29.




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J. Zhao, C. C. Williams, and R. L. Last
Induction of Arabidopsis Tr yptophan Pathway Enzymes and Camalexin by Amino Acid Star vation, Oxidative Stress, and an Abiotic Elicitor
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