Some Effects of Amo‐1618 on Growth, Peroxidase and α‐Amylase Which Cannot Be Easily Explained by Inhibition of Gibberellin Biosynthesis

Abstract

AbstractGrowth and peroxidase activity of roots and stems of lentil seedlings were compared after treatment with Amo‐1618, alone or in combination with gibberellic acid (GA) at varying concentrations. The peroxidase enhancement in Amo‐1618 treated stems could not be attributed to a decrease in the gibberellin content since GA alone had no effect on this enzyme.In other experiments, AMO, at low concentrations, was able to induce α‐amylase production in barley aleurone layers; the lag period needed for this induction, was longer than for GA.These facts seem to indicate that some growth retardants might act at least in some cases by mechanisms other than inhibition of gibberellin biosynthesis and reversal of GA action.