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Annals of Botany 82: 331-336, 1998
© 1998 Annals of Botany Company

Auxin Stimulates Cl-Uptake by Oat Coleoptiles

OLGA BABOURINA+,, SERGEY SHABALA and IAN NEWMAN

Department of Physics, University of Tasmania, GPO Box 252-21, Hobart, Tas, 7001, Australia

February 10, 1998 ; April 20, 1998 . May 15, 1998 .

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 µM1-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-2s-1, maintained for at least 1 h. In the first minutes after auxin application, proton fluxes were small (-25 nmol m-2s-1, an efflux) and tended to decrease, whereas potassium and calcium fluxes changed little, fluctuating from -100 to 0 nmol m-2s-1and from -15 to 0 nmol m-2s-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.Copyright 1998 Annals of Botany Company

Auxin, chloride transport, ion flux,Avena sativaL., oat.


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