The Cytokinins1

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This chapter discusses and evaluates the experiments that appear to be promising steps toward explaining the mode of action of cytokinins. Skoog and Armstrong's thorough coverage of structure-activity relationships and the chemistry of cytokinins, both in free form and in tRNA make a detailed presentation of these subjects unnecessary. It summarizes some of the questions that need to be answered before a testable hypothesis of cytokinin action can be proposed. Three general areas require intensive investigation, which are (1) the physiological significance of cytokinins, (2) the site of action of cytokinins, and (3) the primary biochemical reactions that underlie the cytokinin responses. The chapter summarizes the achievements and points out the questions that need to be answered before attempts can be made to propose models for the mode of action of cytokinins.

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    Dedicated to Prof. Dr. K. Mothes on the occasion of his 70th birthday.

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