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Auxin stimulates Cl- uptake by oat coleoptiles
Citation
Babourina, OK and Shabala, SN and Newman, IA, Auxin stimulates Cl- uptake by oat coleoptiles, Annals of Botany, 82, (3) pp. 331-336. ISSN 0305-7364 (1998) [Refereed Article]
DOI: doi:10.1006/anbo.1998.0686
Abstract
The effects of auxin on net ion fluxes near parenchyma of oat coleoptiles were studied using the non-invasive MIFE system to measure specific ion fluxes using ion selective microelectrodes. Application of 10 μM 1-naphthaleneacetic acid (NAA) for 3 h caused doubling of coleoptile segment growth, without changing the pH of the unbuffered bathing solution from pH 5.4 during that time. Short term experiments revealed that auxin led to an immediate three-fold increase of chloride influx to 1200 nmol m-2 s-1, maintained for at least 1 h. In the first minutes after auxin application, proton fluxes were small (-25 nmol m-2 s-1, an efflux) and tended to decrease, whereas potassium and calcium fluxes changed little, fluctuating from - 100 to 0 nmol m-2 s-1 and from - 15 to 0 nmol m-2 s-1, respectively. It is suggested that one target of auxin action in plant cells is the plasma membrane chloride transport system mediating increased chloride uptake.
Item Details
Item Type: | Refereed Article |
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Research Division: | Physical Sciences |
Research Group: | Medical and biological physics |
Research Field: | Biological physics |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Babourina, OK (Dr Olga Babourina) |
UTAS Author: | Shabala, SN (Professor Sergey Shabala) |
UTAS Author: | Newman, IA (Dr Ian Newman) |
ID Code: | 13598 |
Year Published: | 1998 |
Web of Science® Times Cited: | 15 |
Deposited By: | Physics |
Deposited On: | 1998-08-01 |
Last Modified: | 2011-08-08 |
Downloads: | 0 |
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