Abstract
Considerable experimental evidence supports the view that phytohormones affect transcription (see Letham, 1969). However certain other observations suggest that cytokinins may also modify transiational processes. For example cytokinins maintain the level of ribosomes in excised leaf tissue (Shaw and Manocha, 1965; Srivastava and Arglebe, 1968; Berridge and Ralph, 1969). Although the conclusion that cytokinins promote protein synthesis in excised leaf tissue undergoing senescence (Osborne, 1962) no longer seems valid (see Tavares and Kende, 1970; Kuraishi, 1968), cytokinins markedly increase the specific activity of protein in purified nuclei, mitochondria and plastids incubated with labelled amino acids in vitro (Datta and Sen, 1965; Bhattacharyya and Roy, 1969; Davies and Cocking, 1967). The rapidity of the response to cytokinin in plastids and mitochondria (lag period only a few minutes) suggests that the hormone may promote protein synthesis in a direct way, possibly by interaction with the ribosome.
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Berridge, M.V., Ralph, R.K., Letham, D.S. (1972). On the Significance of Cytokinin Binding to Plant Ribosomes. In: Carr, D.J. (eds) Plant Growth Substances 1970. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65406-0_34
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DOI: https://doi.org/10.1007/978-3-642-65406-0_34
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