The Residual Effect of Auxin on the Cell Wall.

Abstract
It is possible to completely separate in time the action of auxin on the Avena coleoptile section from the time of expansion of this tissue. This conclusion is based on experiments in which auxin is added to Avena coleoptile sections which are prevented from expanding by the presence of 0.3 M mannitol. Auxin pretreatment results in changes which lead to subsequent increased expansion of the section under conditions in which the action of auxin is blocked by a suitable inhibitor. Auxin-induced cell wall loosening takes place only under aerobic conditions, although the effect may persist anaerobically. The cell wall loosening does not persist in the presence of KCN, dinitrophenol, or p-chloromercuribenzoate.

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