Stem extension rate in light‐grown plants. Evidence for an endogenous circadian rhythm in <i>Chenopodium rubrum</i>

Lecharny, Alain; Wagner, Edgar

doi:10.1111/j.1399-3054.1984.tb06089.x

Cited by 49 publications

(35 citation statements)

References 17 publications

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“…In addition to the morphological rhythms, plants have revealed numerous circadian oscillations at the physiological and biochemical levels. Processes as diverse as stem elongation (Lecharny and Wagner, 1984;Lecharny et al, 1990), stomatal opening and closure (Gorton et al, 1989), and many specific enzyme activities (Deng et al, 1989) exhibit circadian control. In most instances, these rhythms have been shown to be reset by light, and in several cases the photoreceptor that mediates the resetting stimulus has been shown to be phytochrome (Simon et al, 1976).…”

Section: Introductionmentioning

confidence: 99%

Circadian Control of cab Gene Transcription and mRNA Accumulation in Arabidopsis.

1991

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An intriguing property of many organisms is their ability to exhibit rhythmic cellular events that continue independently of environmental stimuli. These rhythmic processes are generated by an endogenous mechanism known as the biological clock. We wished to determine whether Arabidopsis thaliana will serve as a model plant system for a molecular genetic dissection of the circadian clock. To this end, we investigated the expression of Arabidopsis chlorophyll a/b-binding protein (cab) genes throughout the circadian cycle. Steady-state mRNA levels of the cab2 and cab3 genes showed a dramatic circadian cycling in plants shifted from light/dark cycles to constant darkness, whereas the cabl mRNA level exhibited little or no cycling under the same conditions. Analysis of cab promoter fusions in transgenic tobacco revealed that both the cabl and cab2 5' upstream regions confer circadian-regulated expression on a chloramphenicol acetyltransferase (cat) reporter gene. In vitro nuclear run-on transcription assays also indicated that the transcription of the cabl and cab2 genes is circadian regulated in Arabidopsis. Taken together, these data suggest that a post-transcriptional mechanism influences cabl mRNA levels in Arabidopsis. The identification of circadian-regulated cis-acting elements in the cabl and cab2 upstream regions will provide powerful tools for both molecular and genetic analysis of the higher plant circadian clock.

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Section: Introductionmentioning

confidence: 99%

Circadian Control of cab Gene Transcription and mRNA Accumulation in Arabidopsis.

1991

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“…This technique has been used recently with Chenopodium rubrum to demonstrate a circadian rhythm in SER of internodes of green plants in constant conditions of light and temperature (15). This plant, therefore, seemed particularly suited to study the interaction of light and temperature signals with the physiological clock.…”

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confidence: 99%

Stem Extension Rate in Light-Grown Plants

Lecharny¹,

Schwall²,

Wagner³

1985

Plant Physiol.

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In this publication we report the effects of cycles of light-dark and high-low temperature on SER of C. rubrum. The basic kinetics of pure photo-and thermoperiodic effects on SER are taken as a system of reference to study the interaction of light and temperature signals. The results are discussed in relation to current hypotheses ofthe nature of the biological clock and light perception in green plants (22,23).In their natural environment, plants develop under photo-and thermoperiodic conditions which change with the seasons. Developmental and behavioral responses of plants clearly demonstrate their potential for measuring the duration and sequence of environmental conditions. It is now generally accepted that time measurement in eukaryotes depends on the interaction of an

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“…This response is mediated by phytochromes and cryptochromes, photoreceptors that sense red and far-red light or blue light, respectively (Jiao et al, 2007). Stem elongation is also controlled by the plant circadian system, a complex transcriptional network that affects many aspects of plant physiology and growth (Lecharny and Wagner, 1984). When seedlings are maintained in constant environmental conditions, growth is clock regulated such that rapid hypocotyl elongation occurs at the end of the subjective day but little or no growth occurs during the subjective morning (Dowson-Day and Millar, 1999).…”

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Genomic Analysis of Circadian Clock-, Light-, and Growth-Correlated Genes Reveals PHYTOCHROME-INTERACTING FACTOR5 as a Modulator of Auxin Signaling in Arabidopsis

2011

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Plants exhibit daily rhythms in their growth, providing an ideal system for the study of interactions between environmental stimuli such as light and internal regulators such as the circadian clock. We previously found that two basic loop-helix-loop transcription factors, PHYTOCHROME-INTERACTING FACTOR4 (PIF4) and PIF5, integrate light and circadian clock signaling to generate rhythmic plant growth in Arabidopsis (Arabidopsis thaliana). Here, we use expression profiling and realtime growth assays to identify growth regulatory networks downstream of PIF4 and PIF5. Genome-wide analysis of light-, clock-, or growth-correlated genes showed significant overlap between the transcriptomes of clock-, light-, and growth-related pathways. Overrepresentation analysis of growth-correlated genes predicted that the auxin and gibberellic acid (GA) hormone pathways both contribute to diurnal growth control. Indeed, lesions of GA biosynthesis genes retarded rhythmic growth. Surprisingly, GA-responsive genes are not enriched among genes regulated by PIF4 and PIF5, whereas auxin pathway and response genes are. Consistent with this finding, the auxin response is more severely affected than the GA response in pif4 pif5 double mutants and in PIF5-overexpressing lines. We conclude that at least two downstream modules participate in diurnal rhythmic hypocotyl growth: PIF4 and/or PIF5 modulation of auxin-related pathways and PIF-independent regulation of the GA pathway.

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Stem extension rate in light‐grown plants. Evidence for an endogenous circadian rhythm in Chenopodium rubrum

Cited by 49 publications

References 17 publications

Circadian Control of cab Gene Transcription and mRNA Accumulation in Arabidopsis.

Circadian Control of cab Gene Transcription and mRNA Accumulation in Arabidopsis.

Stem Extension Rate in Light-Grown Plants

Genomic Analysis of Circadian Clock-, Light-, and Growth-Correlated Genes Reveals PHYTOCHROME-INTERACTING FACTOR5 as a Modulator of Auxin Signaling in Arabidopsis

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