Effect of 2,4-dichlorophenoxyacetic acid on the dark- and light-induced pulvinar movements in Cassia fasciculata Michx |
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Authors: | Janine Bonmort Gabriel Roblin |
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Institution: | (1) Station Biologique de Beau Site, University of Poitiers, 25 Faubourg Saint-Cyprien, F-86000 Poitiers, France |
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Abstract: | 2,4-dichlorophenoxyacetic (2,4-D) applied to excised leaves of Cassia fasciculata modified the dark-induced (scotonasty) and light-induced (photonasty) leaflet movements, showing that this compound acts on rapid turgor variation and the concomitant ion migrations, in particular K+. 2,4-D inhibited the scotonastic closure in a dose-dependent manner from 10–8
M to 10–5
M and promoted the photonastic opening in the same range of concentrations. The compound acted rapidly since a treatment as short as 5 min gave an obvious effect on the motile reaction; however, a lag period of 45–60 min was needed to observe its effect. Although 2,4-D is a weak acid, its greatest physiological efficiency was obtained with pH values close to neutrality. The physiological results are discussed in relation to the chemical properties and the characteristics of transport of the molecule.Abbreviations ABA
abscisic acid
- 6-BAP
6-benzylaminopurine
- 2,4-D
2,4 dichlorophenoxyacetic acid
- GA3
gibberellic acid
- HEPES
N-2-hydroxyethyl] piperazine-N-2-ethanesulphonic acid]
- IAA
indole-3-acetic acid
- NAA
1-naphthaleneacetic acid
- MES
2-(N-morpholino)-ethanesulphonic acid |
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Keywords: | auxin Cassia fasciculata 2 4-dichlorophenoxyacetic acid osmoregulation pulvinus movement |
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