Conditional Circadian Regulation of PHYTOCHROME AGene Expression

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Zeitschriftentitel:	Plant Physiology
Personen und Körperschaften:	Hall, Anthony, Kozma-Bognár, László, Tóth, Réka, Nagy, Ferenc, Millar, Andrew J.
In:	Plant Physiology, 127, 2001, 4, S. 1808-1818
Format:	E-Article
Sprache:	Englisch
veröffentlicht:	Oxford University Press (OUP)
Schlagwörter:	Plant Science Genetics Physiology

author_facet	Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J. Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J.
author	Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J.
spellingShingle	Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J. Plant Physiology Conditional Circadian Regulation of PHYTOCHROME AGene Expression Plant Science Genetics Physiology
author_sort	hall, anthony
spelling	Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J. 1532-2548 0032-0889 Oxford University Press (OUP) Plant Science Genetics Physiology http://dx.doi.org/10.1104/pp.010294 <jats:title>Abstract</jats:title> <jats:p>The phytochrome photoreceptors and the circadian clock control many of the same developmental processes, in all organs and throughout the growth of Arabidopsis plants. Phytochrome A (phyA) provides light input signals to entrain the circadian clock. The clock is known to rhythmically regulate its light input pathway, so we tested rhythmic regulation of phyA, using transgenic plants carrying aPHYA promoter fusion to the luciferase reporter (PHYA:LUC). We provide the first images ofLUC activity with subcellular resolution in intact tissue. PHYA transcription and the accumulation of all three PHYA mRNAs were indeed clock controlled.PHYA is expressed throughout the seedling, so we tested whether circadian rhythms were observed in allPHYA-expressing organs and whether the rhythms were autonomously controlled by each organ. In contrast to our previous results using other clock controlled genes, the rhythmic pattern ofPHYA expression varied markedly among isolated organs and between isolated organs and intact plants. High-amplitude rhythms were maintained for many days in isolated leaves in darkness, whereas the leaves of intact plants rapidly lost rhythmicity. Wounding the leaves of intact plants had no effect. The rhythmic pattern ofPHYA expression is not organ autonomous but depends upon the physical continuity or isolation of the rhythmic tissues, consistent with the presence of a transmitted signal that controls the overt expression of circadian rhythms without necessarily affecting the underlying clock. A circadian system might be present in most, if not all, plant cells, but its effect on intracellular rhythms can be controlled by supracellular signaling.</jats:p> Conditional Circadian Regulation of <i>PHYTOCHROME A</i>Gene Expression Plant Physiology
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title	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_unstemmed	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_full	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_fullStr	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_full_unstemmed	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_short	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_sort	conditional circadian regulation of <i>phytochrome a</i>gene expression
topic	Plant Science Genetics Physiology
url	http://dx.doi.org/10.1104/pp.010294
publishDate	2001
physical	1808-1818
description	<jats:title>Abstract</jats:title> <jats:p>The phytochrome photoreceptors and the circadian clock control many of the same developmental processes, in all organs and throughout the growth of Arabidopsis plants. Phytochrome A (phyA) provides light input signals to entrain the circadian clock. The clock is known to rhythmically regulate its light input pathway, so we tested rhythmic regulation of phyA, using transgenic plants carrying aPHYA promoter fusion to the luciferase reporter (PHYA:LUC). We provide the first images ofLUC activity with subcellular resolution in intact tissue. PHYA transcription and the accumulation of all three PHYA mRNAs were indeed clock controlled.PHYA is expressed throughout the seedling, so we tested whether circadian rhythms were observed in allPHYA-expressing organs and whether the rhythms were autonomously controlled by each organ. In contrast to our previous results using other clock controlled genes, the rhythmic pattern ofPHYA expression varied markedly among isolated organs and between isolated organs and intact plants. High-amplitude rhythms were maintained for many days in isolated leaves in darkness, whereas the leaves of intact plants rapidly lost rhythmicity. Wounding the leaves of intact plants had no effect. The rhythmic pattern ofPHYA expression is not organ autonomous but depends upon the physical continuity or isolation of the rhythmic tissues, consistent with the presence of a transmitted signal that controls the overt expression of circadian rhythms without necessarily affecting the underlying clock. A circadian system might be present in most, if not all, plant cells, but its effect on intracellular rhythms can be controlled by supracellular signaling.</jats:p>
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author	Hall, Anthony, Kozma-Bognár, László, Tóth, Réka, Nagy, Ferenc, Millar, Andrew J.
author_facet	Hall, Anthony, Kozma-Bognár, László, Tóth, Réka, Nagy, Ferenc, Millar, Andrew J., Hall, Anthony, Kozma-Bognár, László, Tóth, Réka, Nagy, Ferenc, Millar, Andrew J.
author_sort	hall, anthony
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description	<jats:title>Abstract</jats:title> <jats:p>The phytochrome photoreceptors and the circadian clock control many of the same developmental processes, in all organs and throughout the growth of Arabidopsis plants. Phytochrome A (phyA) provides light input signals to entrain the circadian clock. The clock is known to rhythmically regulate its light input pathway, so we tested rhythmic regulation of phyA, using transgenic plants carrying aPHYA promoter fusion to the luciferase reporter (PHYA:LUC). We provide the first images ofLUC activity with subcellular resolution in intact tissue. PHYA transcription and the accumulation of all three PHYA mRNAs were indeed clock controlled.PHYA is expressed throughout the seedling, so we tested whether circadian rhythms were observed in allPHYA-expressing organs and whether the rhythms were autonomously controlled by each organ. In contrast to our previous results using other clock controlled genes, the rhythmic pattern ofPHYA expression varied markedly among isolated organs and between isolated organs and intact plants. High-amplitude rhythms were maintained for many days in isolated leaves in darkness, whereas the leaves of intact plants rapidly lost rhythmicity. Wounding the leaves of intact plants had no effect. The rhythmic pattern ofPHYA expression is not organ autonomous but depends upon the physical continuity or isolation of the rhythmic tissues, consistent with the presence of a transmitted signal that controls the overt expression of circadian rhythms without necessarily affecting the underlying clock. A circadian system might be present in most, if not all, plant cells, but its effect on intracellular rhythms can be controlled by supracellular signaling.</jats:p>
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spelling	Hall, Anthony Kozma-Bognár, László Tóth, Réka Nagy, Ferenc Millar, Andrew J. 1532-2548 0032-0889 Oxford University Press (OUP) Plant Science Genetics Physiology http://dx.doi.org/10.1104/pp.010294 <jats:title>Abstract</jats:title> <jats:p>The phytochrome photoreceptors and the circadian clock control many of the same developmental processes, in all organs and throughout the growth of Arabidopsis plants. Phytochrome A (phyA) provides light input signals to entrain the circadian clock. The clock is known to rhythmically regulate its light input pathway, so we tested rhythmic regulation of phyA, using transgenic plants carrying aPHYA promoter fusion to the luciferase reporter (PHYA:LUC). We provide the first images ofLUC activity with subcellular resolution in intact tissue. PHYA transcription and the accumulation of all three PHYA mRNAs were indeed clock controlled.PHYA is expressed throughout the seedling, so we tested whether circadian rhythms were observed in allPHYA-expressing organs and whether the rhythms were autonomously controlled by each organ. In contrast to our previous results using other clock controlled genes, the rhythmic pattern ofPHYA expression varied markedly among isolated organs and between isolated organs and intact plants. High-amplitude rhythms were maintained for many days in isolated leaves in darkness, whereas the leaves of intact plants rapidly lost rhythmicity. Wounding the leaves of intact plants had no effect. The rhythmic pattern ofPHYA expression is not organ autonomous but depends upon the physical continuity or isolation of the rhythmic tissues, consistent with the presence of a transmitted signal that controls the overt expression of circadian rhythms without necessarily affecting the underlying clock. A circadian system might be present in most, if not all, plant cells, but its effect on intracellular rhythms can be controlled by supracellular signaling.</jats:p> Conditional Circadian Regulation of <i>PHYTOCHROME A</i>Gene Expression Plant Physiology
spellingShingle	Hall, Anthony, Kozma-Bognár, László, Tóth, Réka, Nagy, Ferenc, Millar, Andrew J., Plant Physiology, Conditional Circadian Regulation of PHYTOCHROME AGene Expression, Plant Science, Genetics, Physiology
title	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_full	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_fullStr	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_full_unstemmed	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_short	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
title_sort	conditional circadian regulation of <i>phytochrome a</i>gene expression
title_unstemmed	Conditional Circadian Regulation of PHYTOCHROME AGene Expression
topic	Plant Science, Genetics, Physiology
url	http://dx.doi.org/10.1104/pp.010294