GrainGenes Reference Report: BBR-319-1190
Reference
BBR-319-1190
Title
Direct involvement of hydrogen peroxide in curvature of wheat coleoptile in blue-light-treated and dark-grown coleoptiles
Journal
Biochemical and Biophysical Research Communications
Year
2004
Volume
319
Pages
1190-1196
Author
Chandrakuntal K Kumar PG Laloraya M Laloraya MM
Abstract
Blue-light-induced photomorphogenesis is the sum total of a sequence of phenomena involving absorption of light by specific receptors, generation of a signal, processing transmembrane transport of signal, and the activation of a cascade of reactions in the cell interior. Though four blue-light receptors cryptochrome1, cryptochrome2, phototropin1, and phototropin2 have been identified, the signal transduction events associated with blue-light receptor activation are not understood. In this report, we demonstrate the generation and spatiotemporal distribution of H2O2 in wheat coleoptile in response to blue light. Interception of the free-radical generation pathways dithiothreitol and propyl gallate rendered wheat coleoptile tips phototropically non-responsive. Unilateral application of H2O2 onto the sub-apical region of a growing coleoptile brought about curvature in dark. Blue light also caused lipid peroxidation and augmented membrane rigidity of coleoptile cell membranes. We conclude that H2O2 can act as a translocating second messenger that could bring about coleoptile curvature, and the signaling events may trigger Ca2+ signaling cascades, changes in gene expression, and protein modifications
External Databases
Pubmed: 15194492
Keyword
activation
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GrainGenes Reference Report: BBR-319-1190
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||