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Characterisation of chloride transport at the tonoplast of higher plants using a chloride-sensitive fluorescent probe

Effects of other anions, membrane potential, and transport inhibitors

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Abstract

The characteristics of Cl transport in isolated tonoplast vesicles from red-beet (Beta vulgaris L.) storage tissue have been investigated using the Cl-sensitive fluorescent probe, 6-methoxy-1-(3-sulfonatopropyl)-quinolinium (SPQ). The imposition of (inside) positive diffusion potentials, generated with K+ and valinomycin, increased the initial rate of Cl transport, demonstrating that Cl could be electrically driven into the vesicles. Chloride influx was unaffected by SO 2-4 , but was competitively blocked by NO 3 , indicating that both Cl and NO 3 may be transported by the same porter. In some preparations, increases in free-Ca2+ concentration from 10−8 to 10−5 mol·dm−3 caused a significant decrease in Cl influx, which may indicate that cytosolic Ca2+ concentration has a role in controlling Cl fluxes at the tonoplast. However, this effect was only seen in about 50% of membrane preparations and some doubt remains over its physiological significance. A range of compounds known to block anion transport in other systems was tested, and some partially blocked Cl transport. However, many of these inhibitors interfered with SPQ fluorescence and so only irreversible effects could be tested. The results are discussed in the context of recent advances made using the patch-clamp technique on isolated vacuoles.

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Abbreviations

BTP:

1,3-bis[tris(hydroxymethyl)-methylamino]propane

DTT:

dithiothreitol

EDTA:

ethylenediaminetetraacetic acid

Δψ :

membrane potential

ΔpH:

pH gradient

SPQ:

6-methoxy-1-(3-sulfonatopropyl)quinolinium

Tricine:

N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl] glycine

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Pope, A.J., Leigh, R.A. Characterisation of chloride transport at the tonoplast of higher plants using a chloride-sensitive fluorescent probe. Planta 181, 406–413 (1990). https://doi.org/10.1007/BF00195895

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