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Differential effects of brefeldin A and cycloheximide on the activity of auxin efflux carriers in Cucurbita pepo L.

Record type: Article

Brefeldin A (BFA), an inhibitor of Golgi-mediated protein traffic, stimulated net uptake of indole-3-acetic acid (IAA) by etiolated zucchini (Cucurbita pepo L.) hypocotyl tissue with a lag of less than 10 min, substantially reduced the rate of efflux of IAA from pre-loaded zucchini tissue, and strongly inhibited polar transport of IAA in zucchini hypocotyl and pea internode (Pisum sativum L.) segments. Pre-treatment of zucchini tissue with BFA (60 min), but not its simultaneous addition to the uptake medium, also greatly increased the FCCP-sensitive uptake of IAA by microsomal vesicles prepared from the pre-treated tissue. In contrast to the effects of BFA, application of the translation inhibitor cycloheximide (CH) did not affect any of the parameters of IAA transport investigated for at least 80 min and did not alter the responses to BFA. Nevertheless, CH rapidly (<10 min) reduced the incorporation of L-[35S]methionine into TCA-insoluble cell proteins and into microsomal membrane proteins. Together these results provide strong evidence that an essential protein component of the auxin efflux carrier system, targeted to the plasma membrane through the Golgi-mediated secretory system, turns over rapidly in the plasma membrane without a requirement for concurrent protein synthesis.

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Citation

Robinson, J.S., Albert, A.C. and Morris, D.A. (1999) Differential effects of brefeldin A and cycloheximide on the activity of auxin efflux carriers in Cucurbita pepo L. Journal of Plant Physiology, 155, (6), pp. 678-684.

More information

Published date: 1 December 1999
Keywords: biological transport, absorption, cell permeability, carrier protein, golgi apparatus, hypocotyl, cucurbita pepo, pisum sativum, cycloheximide, cucurbitaceae, dicotyledones, angiospermae, spermatophyta, leguminosae, inhibitor, plant growth substance

Identifiers

Local EPrints ID: 56678
URI: http://eprints.soton.ac.uk/id/eprint/56678
ISSN: 0176-1617
PURE UUID: dd68f1cd-89bf-457f-9414-c45594c0930a

Catalogue record

Date deposited: 22 Aug 2008
Last modified: 17 Jul 2017 14:30

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Contributors

Author: J.S. Robinson
Author: A.C. Albert
Author: D.A. Morris

University divisions

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