1988•Unpublished venueRequires access
The Role of the Coleoptile Apex in Controlling Organ Elongation
A. J. Parsons, Richard D. Firn, J. Digby
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Abstract
Parsons, A., Firn, R. D. and Digby, J. 1988. The role of the coleoptile apex in controlling organ elongation. II. Effects of auxin substitution and auxin transport inhibitors on decapitated coleoptiles.—J. exp. Bot. 39: 1343-1354. The most widely quoted evidence that auxin controls coleoptile elongation is that auxin applied to the cut surface of a coleoptile can obviate the effects of decapitation. A quantitative study of this old observation shows that exogenously applied auxin only overcomes the effects of decapitation if supplied at unphysiologically high concentrations. Furthermore, when a ring of an auxin transport inhibitor is applied just beneath the apex of an intact coleoptile, so that auxin supplied from the apex is abolished, the growth rate of the coleoptile is not reduced significantly. These experiments suggest that coleoptile elongation is not dependent on auxin transported from the apex.