Abstract
SEVERAL chemical substances retard the decrease of chlorophyll content and the accompanying loss of protein and ribonucleic acid (RNA) which normally occurs as leaf disks senesce when they are floated on water. Among the compounds which retard senescence are the kinetins and related compounds1–5 and auxins6,7. Gibberellic acid has been reported to delay the senescence of leaf disks of Taraxacum officinale8–10, and in this work it was indicated that senescence delayed by gibberellic acid was not widespread because it was observed in only one of seventeen species tested. Whyte and Luckwill11, however, have since reported that the acid delayed the senescence of leaf disks of Rumex obtusifolium. The retardation of senescence of leaf disks of nasturtium (Trapaeolum majus) after treatment with gibberellic acid has recently been recorded in this laboratory12.
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BEEVERS, L., GUERNSEY, F. Interaction of Growth Regulators in the Senescence of Nasturtium Leaf Disks. Nature 214, 941–942 (1967). https://doi.org/10.1038/214941a0
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DOI: https://doi.org/10.1038/214941a0
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