Abstract
Summary Indoleacetic acid (IAA)-induced senescence of isolated carnation ( Dianthus caryophyllus L. cv. Kaly) petals was delayed with the application of benzyladenine (BA). BA reduced the IAA-induced ethylene emanation and retarded the overall rate of (1- 14 C)- and (2- 14 C)-IAA metabolism. In the presence of BA the IAA-induced metabolism that did occur appeared to be largely a result of decarboxylation. It is possible that in the absence of BA, IAA was conjugated rapidly. This could, however, not be substantiated. Using the isolated petal system as a bioassay, reapplication of the major IAA metabolite did not accelerate petal senescence to the degree seen with the application of IAA.
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