Abstract
Leaves of the semi-aquatic celery-leaved crowfoot ( Ranunculus sceleratus L.) exhibited petiole growth through cell elongation in response to submergence or when treated with ethylene or auxin. The auxin-transport inhibitors, naptalam (1- N-naphthylphthalamic acid) and the morphactins IT 3456 (2-chlorofluorenol methyl ester) and IT 3233 (9-hydroxyfluorenolcarboxylic acid-9-n-butyl ester) had no effect on the response to 10 −4 M indole acetic acid (IAA), but inhibited the growth response to 1 μl 1 −1 ethylene. Isolated petiole segments were more sensitive to auxin than to ethylene.
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