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Annals of Botany 62: 487-495, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

The Role of Basipetal Auxin Transport in the Positional Control of Abscission Sites Induced in Impatiens sultani Stem Explants

J. WARREN WILSON*, E. S. WALKER* and P. M. WARREN WILSON{dagger}

*Department of Botany, Faculty of Science and Research School of Biological Sciences, Australian National University GPO Box 4, Canberra, ACT 2601, Australia
{dagger}Plant Cell Biology Group and Research School of Biological Sciences, Australian National University GPO Box 4, Canberra, ACT 2601, Australia

Accepted: 23 May 1988   

If segments of Impatiens sultani stem are explanted and incubated, separation layers often form across them and lead to abscission. To test the suggested role of auxin concentration in controlling the position of abscission sites, explants were labelled by applying [14C]IAA to the shoot tip 4 h prior to explanting; transport of auxin applied in this way seems to resemble that of endogenous auxin. During subsequent incubation of explants for 20 h, basipetal transport resulted in 14C accumulating just above the base of the explants (nearly 80 % in the bottom 4 mm of 24 mm explants). In internodal explants that had been wounded at explanting by incising one side so as to sever a vascular bundle, and in nodal explants with the leaf removed, the 14C also accumulated just above the wound or node to about twice the concentration otherwise expected; this accumulation was probably due to basipetal transport being impeded by vascular discontinuity at the wound or node. Accumulation just above the base, or above a wound or node, resulted in gradients of 14C concentration (presumably reflecting endogenous auxin concentration) decreasing in the morphologically upward direction at each of these three positions where abscission sites tend to occur.

Impatiens sultani, abscission, auxin, IAA, node, polarized transport, positional control, separation layer, wounding


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