Abstract
The initial and transient growth responses of coleoptile sections of Dwarf-1 corn ( Zea mays L.) to picloram (4-amino-3,5,6-trichloropicolonic acid) were studied and compared to those produced after IAA (indole-3-acetic acid) treatments. Growth was measured every 36 sec with an angular displacement transducer. Picloram-mediated and also IAA-mediated growth recorded approximately 10 min of lag period before any growth response was elicited. The rate of picloram-mediated growth then increased rapidly, reaching a maximum between 25 and 40 min after treatment. This was followed by a second maximum approximately 80 min after treatment; then the growth rate slowly decreased to a constant level. The shape of the rate curve of picloram-mediated growth was essentially the same as that obtained after IAA treatment. Analysis of growth kinetics suggests that modes of growth stimulating action of picloram may not involve IAA metabolism inplants, but suggests that the compound is itself an auxin.
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