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Auxin-Induced K+Channel Expression Represents an Essential Step in Coleoptile Growth and Gravitropism
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Auxin-Induced K+Channel Expression Represents an Essential Step in Coleoptile Growth and Gravitropism
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Journal Article
Auxin-Induced K+Channel Expression Represents an Essential Step in Coleoptile Growth and Gravitropism
1999
Overview
Auxin-induced growth of coleoptiles depends on the presence of potassium and is suppressed by K+channel blockers. To evaluate the role of K+channels in auxin-mediated growth, we isolated and functionally expressed ZMK1 and ZMK2 (Zea mays K+channel 1 and 2), two potassium channels from maize coleoptiles. In growth experiments, the time course of auxin-induced expression of ZMK1 coincided with the kinetics of coleoptile elongation. Upon gravistimulation of maize seedlings, ZMK1 expression followed the gravitropic-induced auxin redistribution. K+channel expression increased even before a bending of the coleoptile was observed. The transcript level of ZMK2, expressed in vascular tissue, was not affected by auxin. In patch-clamp studies on coleoptile protoplasts, auxin increased K+channel density while leaving channel properties unaffected. Thus, we conclude that coleoptile growth depends on the transcriptional up-regulation of ZMK1, an inwardly rectifying K+channel expressed in the nonvascular tissue of this organ.
Publisher
National Academy of Sciences of the United States of America,National Acad Sciences,The National Academy of Sciences
Subject
/ Animals
/ Auxins
/ Bending
/ Corn
/ Cotyledon - growth & development
/ Gene Expression Regulation, Plant
/ genetics
/ gravity
/ Indoleacetic Acids - metabolism
/ Indoleacetic Acids - pharmacology
/ Kinetics
/ Naphthaleneacetic Acids - metabolism
/ Naphthaleneacetic Acids - pharmacology
/ Oocytes
/ Plant Growth Regulators - metabolism
/ Plant Growth Regulators - pharmacology
/ Plant Shoots - growth & development
/ Potassium Channels - drug effects
/ Potassium Channels - genetics
/ Potassium Channels - metabolism
/ Xenopus
/ Zea mays
