Phytochrome A regulates the intracellular distribution of phototropin 1-green fluorescent protein in Arabidopsis thaliana
| Autor: | William Eisinger, Tong-Seung Tseng, In-Seob Han, Winslow R. Briggs |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Phototropin
animal structures Light Recombinant Fusion Proteins Green Fluorescent Proteins Arabidopsis Plant Science Protein Serine-Threonine Kinases Green fluorescent protein Phytochrome A Botany Arabidopsis thaliana Phototropism Research Articles biology Arabidopsis Proteins Far-red Cell Biology biology.organism_classification Phosphoproteins Plants Genetically Modified Protein Transport Etiolation Darkness Biophysics |
| Zdroj: | The Plant cell. 20(10) |
| ISSN: | 1040-4651 |
| Popis: | It has been known for decades that red light pretreatment has complex effects on subsequent phototropic sensitivity of etiolated seedlings. Here, we demonstrate that brief pulses of red light given 2 h prior to phototropic induction by low fluence rates of blue light prevent the blue light–induced loss of green fluorescent protein–tagged phototropin 1 (PHOT1-GFP) from the plasma membrane of cortical cells of transgenic seedlings of Arabidopsis thaliana expressing PHOT1-GFP in a phot1-5 null mutant background. This red light effect is mediated by phytochrome A and requires ∼2 h in the dark at room temperature to go to completion. It is fully far red reversible and shows escape from photoreversibility following 30 min of subsequent darkness. Red light–induced inhibition of blue light–inducible changes in the subcellular distribution of PHOT1-GFP is only observed in rapidly elongating regions of the hypocotyl. It is absent in hook tissues and in mature cells below the elongation zone. We hypothesize that red light–induced retention of the PHOT1-GFP on the plasma membrane may account for the red light–induced increase in phototropic sensitivity to low fluence rates of blue light. |
| Databáze: | OpenAIRE |
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