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Plant Physiology 78:438-441 (1985)
© 1985 American Society of Plant Biologists

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Tyrosine and Phenylalanine Ammonia Lyase Activities during Shoot Initiation in Tobacco Callus Cultures 1

Lynda D. Beaudoin-Eagan and Trevor A. Thorpe

Plant Physiology Research Group, Department of Biology, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Both phenylalanine ammonia lyase and tyrosine ammonia lyase were detected in tobacco (Nicotiana tabacum L. Wisconsin 38) callus. The enzymes were separated from each other by Sephadex G-200 column chromatography. Increased activity of tyrosine ammonia lyase was observed during culture of tobacco callus under shoot-forming conditions, while activity of phenylalanine ammonia lyase increased during culture under non-organ-forming conditions. Confirmation of these findings was obtained by examining the incorporation of [14C]tyrosine and [14C]phenylalanine into p-coumarate and trans-cinnamate, respectively.

1 Supported by Natural Sciences and Engineering Research Council of Canada Grant A6467 to T.A.T.




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Copyright © 1985 by the American Society of Plant Biologists