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Auxin-induced Changes in the Incorporation of ³H-Amino Acids into Soybean Ribosomal Proteins ¹

^a Department of Botany, University of Georgia, Athens, Georgia 30602

Auxin-induced activation of 80S ribosomes and polyribosome formation in mature soybean (Glycine max var. Hawkeye) hypocotyl (R. L. Travis, J. M. Anderson, and J. L. Key. 1973. Plant Physiol. 52: 608-612) in the presence of a mixture of radioactive amino acids correlates with an increased specific radioactivity of at least three ribosomal proteins; the labeling of one of these increased severalfold above the control level. Results of experiments with 5-fluorouracil and cycloheximide indicated that the proteins in question were synthesized in response to auxin and became associated with pre-existing ribosomes. Ribosome dissociation experiments indicated that these proteins were associated with the 60S ribosome subunit.

¹ This research was supported by Energy Research and Development Administration Contract AT (38-1)-643 and Public Health Service research Grant CA 11624 from the National Cancer Institute.