Ribonucleic Acid and Protein Synthesis as Essential Processes for Cell Elongation

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Abstract
RNA and protein synthesis associated with cell elongation of excised soybean hypocotyl tissue were investigated using actinomycin D, 8-azaguanine, and puromycin. The data presented are consistent with the view that the proposed actions of actinomycin D, 8-azaguanine, and puromycin in bacteria are operative in soybean hypocotyl tissue. Based on the action of the inhibitors and the effects of these chemicals on cell elongation, it is concluded that RNA and protein synthesis are essential for the process of cell elongation to proceed at the normal rate. Moreover, the enhancement by auxin of the rate of cell elongation requires active RNA synthesis, and in turn protein synthesis. Presumably the rate of formation of some specific RNA is enhanced by auxin (either directly or indirectly) leading to an increased supply of some limiting enzyme or enzyme system. The way in which auxin alters RNA synthesis remains obscure.