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Plant Physiology 67:1185-1189 (1981) © 1981 American Society of Plant Biologists Cytokinin-Active Ribonucleosides in Phaseolus RNAII. DISTRIBUTION IN tRNA SPECIES FROM ETIOLATED P. VULGARIS L. SEEDLINGS 1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331
The distribution of cytokinin-active ribonucleosides in tRNA species from etiolated Phaseolus vulgaris L. seedlings has been examined. Phaseolus tRNA was fractionated by benzoylated diethylaminoethyl-cellulose and RPC-5 chromatography, and the distribution of cytokinin activity was compared with the distribution of tRNA species expected to correspond to codons beginning with U. Phaseolus tRNACys, tRNATrp, tRNATyr, a major peak of tRNAPhe, and a large fraction of tRNALeu were devoid of cytokinin activity in the tobacco bioassay. Cytokinin activity was associated with all fractions containing tRNASer species and with minor tRNALeu species. In addition, several anomalous peaks of cytokinin activity that could not be directly attributed to U group tRNA species were detected.
2 Present address: Department of Biology, University of California, San Diego, La Jolla, CA 92093. 3 To whom reprint requests should be addressed. 1 This research was supported by National Science Foundation Grant PCM 77-04266, by a National Science Foundation Predoctoral Fellowship to C.A.E., and by the Science and Education Administration of the United States Department of Agriculture under Grant 5901-0410-8-0028-0 from the Competitive Research Grants Office. This is Technical Paper 5579 of the Oregon Agricultural Experiment Station. This article has been cited by other articles:
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