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Light-induced phosphorylation of a membrane protein plays an early role in signal transduction for phototropism in Arabidopsis thalianaBlue light is known to cause rapid phosphorylation of a membrane protein in etiolated seedlings of several plant species, a protein that, at least in etiolated pea seedlings and maize coleoptiles, has been shown to be associated with the plasma membrane. The light-driven phosphorylation has been proposed on the basis of correlative evidence to be an early step in the signal transduction chain for phototropism. In the Arabidopsis thaliana mutant JK224, the sensitivity to blue light for induction of first positive phototropism is known to be 20- to 30-fold lower than in wild type, whereas second positive curvature appears to be normal. While light-induced phosphorylation can be demonstrated in crude membrane preparations from shoots of the mutant, the level of phosphorylation is dramatically lower than in wild type, as is the sensitivity to blue light. Another A. thaliana mutant, JK218, that completely lacks any phototropic responses to up to 2 h of irradiation, shows a normal level of light-induced phosphorylation at saturation. Since its gravitropic sensitivity is normal, it is presumably blocked in some step between photoreception and the confluence of the signal transduction pathways for phototropism and gravitropism. We conclude from mutant JK224 that light-induced phosphorylation plays an early role in the signal transduction chain for phototropism in higher plants.
Document ID
20040090355
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Reymond, P.
(Department of Plant Biology Carnegie Institution of Washington, Stanford, CA 94305)
Short, T. W.
Briggs, W. R.
Poff, K. L.
Date Acquired
August 21, 2013
Publication Date
May 1, 1992
Publication Information
Publication: Proceedings of the National Academy of Sciences of the United States of America
Volume: 89
Issue: 10
ISSN: 0027-8424
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DCB-88 19137
CONTRACT_GRANT: DE-FG02-90ER-20021
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Non-NASA Center
NASA Program Space Biology
NASA Discipline Number 40-50

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