Significance of Circadian Gene Expression in Higher Plants

Beator, Jens; Kloppstech, Klaus

doi:10.3109/07420529609012657

Cited by 19 publications

(9 citation statements)

References 107 publications

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“…Therefore, ELIPs and leaf thionin are antagonistically regulated during greening of etiolated seedlings (Reimann-Philipp et al, 1989;Pö tter and Kloppstech, 1993), during the day in green plants (Adamska et al, 1991;Beator and Kloppstech, 1996), and under light stress and in the presence of JA-Me, as is shown in this publication.…”

Section: Discussionmentioning

confidence: 81%

Differential Effects of Methyl Jasmonate on the Expression of the Early Light-Inducible Proteins and Other Light-Regulated Genes in Barley

Wierstra

Kloppstech

2000

Plant Physiology

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The effects of methyl jasmonate (JA-Me) on early light-inducible protein (ELIP) expression in barley (Hordeum vulgare L. cv Apex) have been studied. Treatment of leaf segments with JA-Me induces the same symptoms as those exhibited by norflurazon bleaching, including a loss of pigments and enhanced light stress that results in increased ELIP expression under both high-and low-light conditions. The expression of both low-and high-molecular-mass ELIP families is considerably down-regulated by JA-Me at the transcript and protein levels. This repression occurs despite increased photoinhibition measurable as a massive degradation of D1 protein and a delayed recovery of photosystem II activity. In JA-Me-treated leaf segments, the decrease of the photochemical efficiency of photosystem II under high light is substantially more pronounced as compared to controls in water. The repression of ELIP expression by JA-Me is superimposed on the effect of the increased light stress that leads to enhanced ELIP expression. The fact that the reduction of ELIP transcript levels is less pronounced than those of light-harvesting complex II and small subunit of Rubisco transcripts indicates that light stress is still affecting gene expression in the presence of JA-Me. The jasmonate-induced protein transcript levels that are induced by JA-Me decline under light stress conditions.

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Section: Discussionmentioning

confidence: 81%

Differential Effects of Methyl Jasmonate on the Expression of the Early Light-Inducible Proteins and Other Light-Regulated Genes in Barley

Wierstra

Kloppstech

2000

Plant Physiology

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“…These 22 photosynthesis genes exhibit striking coregulation, with most peaking around midday at CT4 ( 9 ) . Two LHC genes, the reaction center gene PSADI, and the magnesium chelatase gene have been previously reported to cycle (10,13).…”

Section: Circadian Rhythms Control Processes Rangingmentioning

confidence: 99%

Orchestrated Transcription of Key Pathways in Arabidopsis by the Circadian Clock

Harmer

Hogenesch

Straume

et al. 2000

Science

1,501

1,470

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Like most organisms, plants have endogenous biological clocks that coordinate internal events with the external environment. We used high-density oligonucleotide microarrays to examine gene expression in Arabidopsis and found that 6% of the more than 8000 genes on the array exhibited circadian changes in steady-state messenger RNA levels. Clusters of circadian-regulated genes were found in pathways involved in plant responses to light and other key metabolic pathways. Computational analysis of cycling genes allowed the identification of a highly conserved promoter motif that we found to be required for circadian control of gene expression. Our study presents a comprehensive view of the temporal compartmentalization of physiological pathways by the circadian clock in a eukaryote.

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“…In higher plants, a large number of transcripts undergo circadian oscillations (17)(18)(19). Because none of the corresponding gene products has been shown to be causally involved in the generation of rhythmicity, presumably these rhythms merely reflect outputs from the clock.…”

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confidence: 99%

At GRP7, a nuclear RNA-binding protein as a component of a circadian-regulated negative feedback loop in Arabidopsis thaliana

Heintzen¹,

Nater²,

Apel³

et al. 1997

Proc. Natl. Acad. Sci. U.S.A.

227

209

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The endogenous clock that drives circadian rhythms is thought to communicate temporal information within the cell via cycling downstream transcripts. A transcript encoding a glycine-rich RNA-binding protein, Atgrp7, in Arabidopsis thaliana undergoes circadian oscillations with peak levels in the evening. The AtGRP7 protein also cycles with a time delay so that Atgrp7 transcript levels decline when the AtGRP7 protein accumulates to high levels. After AtGRP7 protein concentration has fallen to trough levels, Atgrp7 transcript starts to reaccumulate. Overexpression of AtGRP7 in transgenic Arabidopsis plants severely depresses cycling of the endogenous Atgrp7 transcript. These data establish both transcript and protein as components of a negative feedback circuit capable of generating a stable oscillation. AtGRP7 overexpression also depresses the oscillation of the circadianregulated transcript encoding the related RNA-binding protein AtGRP8 but does not affect the oscillation of transcripts such as cab or catalase mRNAs. We propose that the AtGRP7 autoregulatory loop represents a ''slave'' oscillator in Arabidopsis that receives temporal information from a central ''master'' oscillator, conserves the rhythmicity by negative feedback, and transduces it to the output pathway by regulating a subset of clock-controlled transcripts.

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Significance of Circadian Gene Expression in Higher Plants

Cited by 19 publications

References 107 publications

Differential Effects of Methyl Jasmonate on the Expression of the Early Light-Inducible Proteins and Other Light-Regulated Genes in Barley

Differential Effects of Methyl Jasmonate on the Expression of the Early Light-Inducible Proteins and Other Light-Regulated Genes in Barley

Orchestrated Transcription of Key Pathways in Arabidopsis by the Circadian Clock

At GRP7, a nuclear RNA-binding protein as a component of a circadian-regulated negative feedback loop in Arabidopsis thaliana

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