Phytochrome and UV signal transduction pathways |
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Authors: | Chris Bowler Hanns Frohnmeyer Eberhard Schäfer Gunther Neuhaus Nam-Hai Chua |
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Institution: | (1) Stazione Zoologica, Villa Comunale, I-80121 Napoli, Italy;(2) Institute for Biology II, University of Freiburg, Schaenzlestr. 1, Freiburg, Germany;(3) Dept of Cell Biology, University of Freiburg, Schaenzlestr. 1, Freiburg, Germany;(4) Laboratory of Plant Molecular Biology, The Rockefeller University, 1230 York Avenue, 10021-6399 New York, NY |
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Abstract: | The phytochromes are the best studied plant photoreceptors, controlling a wide variety of responses at both whole plant and
single cell levels. Three signal transduction pathways, dependent on cGMP and/or calcium, have been found to be utilized by
phytochrome to control the expression of genes required for chloroplast development (e.g., CAB and FNR) and anthocyanin biosynthesis (e.g., CHS). In particular, cGMP is a second messenger positively regulating CHS gene expression whilst calcium and calmodulin act as negative regulators. In addition to phytochrome regulation of CHS we have begun to examine the signal transduction pathways utilized by UV photoreceptors. In contrast to phytochrome-mediated
responses, results indicate a role for calcium and calmodulin as positive regulators of CHS gene expression in UV light. |
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Keywords: | Calcium cGMP Phytochrome UV photoreceptors |
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