Transient Effects of Light on Auxin Transport in the Avena Coleoptile
- 1 February 1967
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 42 (2) , 247-257
- https://doi.org/10.1104/pp.42.2.247
Abstract
The transport of IAA-1-14C through Avena coleoptile segments was studied by applying IAA apically and measuring the basal IAA export rate at 5-min. intervals for 85 min. A transport velocity of 15 to 26 mm per hr. was found. With 0.25 ppm IAA or less in the agar donor blocks, i.e. within the physiological range, the export rate reached a plateau by 30 min. Strong blue light starting at 35 min. reduced the total export for the whole period by 12-17%. The export rate was maximally depressed 25 min. after the onset of Illumination. The rate then rose, peaked 10 min. later, and again declined. This response closely matched the transient inhibition of growth by the same light dose. Above 0.25 ppm IAA, the IAA export rate showed no plateau, but peaked in 60 min. and declined rapidly. Blue light accelerated this decline without accompanying peaks or troughs. Red and far red light appeared to elicit none of these responses. The light growth response probably arises from transient withdrawal of auxin from the basipetal stream while the phototropic lateral transport is developing.This publication has 8 references indexed in Scilit:
- Bound Indoleacetic Acid in Avena ColeoptilesPlant Physiology, 1966
- Hormonal Relations in the Phototropic Response: III. The Movement of C14-labeled and Endogenous Indoleacetic Acid in Phototropically Stimulated Zea ColeoptilesPlant Physiology, 1966
- Control of Furunculosis in Impounded Adult SalmonNature, 1965
- Transport and Distribution of Auxin during Tropistic Response. II. The Lateral Migration of Auxin in Phototropism of ColeoptilesPlant Physiology, 1964
- Uptake of Indole-3-acetic Acid and Indole-3-acetonitrile by Avena Coleoptile SectionsPlant Physiology, 1964
- Red Light, Auxin Relationships, and the Phototropic Responses of Corn and Oat ColeoptilesAmerican Journal of Botany, 1963
- Some Characteristics of Movement of Indoleacetic Acid in Coleoptiles of Avena. I. Uptake, Destruction, Immobilization, & Distribution of IAA During Basipetal TranslocationPlant Physiology, 1962
- Light Growth Response and Auxin Curvatures of AvenaProceedings of the National Academy of Sciences, 1936