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KMID : 0368419970400040256
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Journal of Plant Biology
1997 Volume.40 No. 4 p.256 ~ p.260
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Effect of Ethylene Antagonists on Auxin-induced Inhibition of Intact Primary Root Elongation in Maize(Zea mays L.)
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Kim Soon-Young
Timothy J. Mulkey
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Abstract
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Root elongation was measured in intact primary roots of maize (Zea mays L.) using a computerized root auxanometer. We examined the fact that root elongation was inhibited by auxin-induced ethylene production. Inhibition of root elongation was closely correlated with the concentrations of the exogenously applied auxin. Auxin-induced inhibition of root elongation was reversed by pretreatment or posttreatment of ethylene biosynthesis antagonists such as aminoethyoxyvinylglycine (AVG) and silver ions (Ag^2+). The magnitude of recovery effect was dependent on auxin concentrations. Root elongation was inhibited by adding ethylene producing agents such as 1-aminocyclopropane-1-carboxylic acid (ACC) and Ethephon. ACC- and Ethephon-induced inhibition of root elongation was reversed by blocking ethylene biosynthesis or activity. These data suggested that ethylene was involved in auxin-induced inhibition of root elongation and inhibition of root elongation by applied auxin, at least in part, was a reversible process.
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