Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 54:702-705 (1974)
© 1974 American Society of Plant Biologists

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On the Mechanism of the Changes in Phenylalanine Ammonia-lyase Activity Induced by Ultraviolet and Blue Light in Gherkin Hypocotyls 1

Gerrit Engelsma

a Philips Research Laboratories, Eindhoven, The Netherlands

Irradiation with ultraviolet light causes in the hypocotyl of dark-grown gherkin seedlings the partial conversion of trans-hydroxycinnamic acids to the cis-isomers. The trans-hydroxycinnamic acids inhibit the development of phenylalanine ammonia-lyase activity, and the transformation of these compounds to the much less inhibitory cis-isomers forms a ready explanation for the increase in phenylalanine ammonia-lyase activity in the hypocotyl of gherkin seedlings irradiated with ultraviolet light. Arguments are advanced that the increase in phenylalanine ammonia-lyase activity caused by irradiation with blue light is also (at least in part) initiated by trans-cis isomerisation of the hydroxycinnamic acids.

1 Dedicated to the memory of Milton Zucker who in 1965 was the first to report the photoinduction of phenylalanine ammonia-lyase. The present author was privileged to have many discussions with him in the years thereafter about the regulatory mechanisms concerning this enzyme.






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