Cytokinins in Populus x robusta Schneid: A complex in leaves.
At least seven cytokinins have been detected in mature leaves of Populus x robusta Schneid after chromatography on Sephadex LH-20. Two of these have similar elution volumes to zeatin and zeatin riboside. A third appears to be a cytokinin glucoside. A fourth is a new, unidentified cytokinin, susceptible to mild oxidation, and yielding two cytokinin active products after acid hydrolysis. This cytokinin complex has been found in fully expanded leaves, a tissue in which cell division is completed.
Department of Botany and Microbiology, University College of Wales, SY23 3DA, Aberystwyth, UK.
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Hewett
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Wareing