Action of Auxin on Cell Elongation
- 1 January 1970
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 65 (1), 184-191
- https://doi.org/10.1073/pnas.65.1.184
Abstract
The early time course (0-30 min) of the action of auxin (3-indoleacetic acid) on the elongation of segments from corn coleptiles was studied, using a high-resolution continuous recording technique. Two different effects of auxin were observed: (1) After addition of low auxin concentrations (2 x 10(-7)M) to 4-mm sections, a very rapid (2-3 min) enhancement of elongation was found. Similar early responses were seen following the addition of low concentrations of the methyl ester of indoleacetic acid. (2) Following a large step-up in the auxin level (10(-5), 10(-4), or 10(-3)M), a rapid transient decrease was observed one to three minutes after the addition of indoleacetic acid. It lasted 10-15 minutes at which time the steady rate of auxin-promoted elongation became evident. Similar kinetic patterns of auxin effects other than on elongation and the implications of the findings on hypotheses of the primary action of auxin are discussed.Keywords
This publication has 2 references indexed in Scilit:
- Timing of the Auxin Response in Coleoptiles and Its Implications Regarding Auxin ActionThe Journal of general physiology, 1969
- Effect of IAA on RNA and protein synthesisArchives of Biochemistry and Biophysics, 1968