NDLI: Blue light regulates an auxin-induced $K^{+}-channel$ gene in the maize coleoptile

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Blue light regulates an auxin-induced $K^{+}-channel$ gene in the maize coleoptile

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Blue light regulates an auxin-induced $K^{+}-channel$ gene in the maize coleoptile

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Philippar, K. Fuchs, I. Hedrich, R. Ljung, K. Sandberg, G.
Description	Author Affiliation: Fuchs I ( Lehrstuhl für Molekulare Pflanzenphysiologie und Biophysik, Universität Würzburg, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany.);
Abstract	Auxin redistribution along gravistimulated maize coleoptiles causes differential expression of the auxin-induced K+-channel gene ZMK1 (Zea mays K+ channel 1) and precedes the curvature response. To evaluate the role of ZMK1 during phototropism, we here investigated blue light-stimulated coleoptiles. Four hours of blue light stimulation resulted in phototropic bending (23 degrees ). Rotation on a clinostat, at nominally 'zero' gravity, and simultaneous stimulation with unidirectional blue light, however, resulted in up to 51 degrees bending toward the light. Differential ZMK1 transcription reached a maximum after 90 min of blue light stimulation under gravity, whereas ZMK1 expression remained asymmetric for at least 180 min in photostimulated coleoptiles on a clinostat. We therefore conclude that the stronger phototropic bending under nominally 'zero' gravity results from prolonged differential expression of ZMK1. Under both conditions, asymmetric expression of ZMK1 could be superimposed on the lateral auxin gradient across the coleoptile tip, whereas the gene for the blue light receptor phototropin 1 (PHOT1), expressed in the tip only, was not differentially regulated in response to blue light. The activation of the two different receptors eliciting the photo- and gravitropic response of the coleoptile thus feeds into a common signaling pathway, resulting in auxin redistribution in the coleoptile tip and finally in differential transcription of ZMK1. In the process of signal integration, gravity transduction restricts the magnitude of the blue light-inducible ZMK1 gradient. The spatial and temporal distribution of ZMK1 transcripts and thus differential K+ uptake in both flanks of the coleoptile seem to limit the stimulus-induced bending of this sensory organ.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	20
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Gene Expression Regulation, Plant Radiation Effects Indoleacetic Acids Physiology Potassium Channels Genetics Zea Mays DNA Primers Molecular Sequence Data Research Support, Non-U.S. Gov't Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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