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Plant Physiology 63:35-41 (1979)
© 1979 American Society of Plant Biologists

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Articles

Distribution of Cytokinin-active Ribonucleosides in Wheat Germ tRNA Species 1

Leslie A. Struxnessa and Donald J. Armstronga,2

Ian Gillamb and Gordon M. Tenerb

William J. Burrowsc,3 and Folke Skoogc

a Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331, b Department of Biochemistry, University of British Columbia, Vancouver, British Columbia V6T 1W5 Canada, c Institute of Plant Development, Department of Botany, University of Wisconsin, Madison, Wisconsin 53706

The distribution of cytokinin activity in wheat (Triticum aestivum) germ tRNA fractionated by BD-cellulose and RPC-5 chromatography has been examined. As in other organisms, the cytokinin moieties in wheat germ tRNA appear to be restricted to tRNA species that would be expected to respond to codons beginning with U. Only a few of the wheat germ tRNA species in this coding group actually contain cytokinin modifications. Cytokinin activity was associated with isoaccepting tRNASer species and with a minor tRNALeu species from wheat germ. All other wheat germ tRNA species corresponding to codons beginning with U were devoid of cytokinin activity in the tobacco callus bioassay.

2 To whom reprint requests should be addressed.

3 Present address: Shell Research Ltd., Woodstock Laboratory, Sittingbourne Research Centre, Sittingbourne, Kent ME9 8AG England.

1 This work was supported at Oregon State University by National Science Foundation Grant BMS75-02588, at the University of British Columbia by the Medical Research Council (Ottawa) Grant MT-1279, and at the University of Wisconsin by National Science Foundation Grant BMS72-0226.






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Copyright © 1979 by the American Society of Plant Biologists