Abstract
MEASUREMENTS of chlorophyll breakdown in isolated leaf disks have shown that senescence is retarded by application of several different growth stimulators1, including cytokinins and gibberellins, which differ markedly in their effects on different species. Particular species (for example, Xanthium pennsylvanicum Wall.) respond to cytokinins to such a great extent that the reaction is considered specific for these compounds, while other species (for example, Rumex obtusifolius L.) are similarly much more responsive to gibberellins. In the case of Xanthium, high concentrations of sugars gave a very low response while other compounds were almost inactive2. In the case of Rumex, glucose and fructose in concentrations up to 5 per cent were inactive3. Bioassays for cytokinins2 and gibberellins3,4 have been developed on the basis of these findings.
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REYNOLDS, T. Senescence Retardation in Dock Leaves by Soluble Peptone. Nature 223, 505–506 (1969). https://doi.org/10.1038/223505a0
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DOI: https://doi.org/10.1038/223505a0
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