?Circadian clock? directs the expression of plant genes

Piechulla, Birgit

doi:10.1007/bf00015982

Cited by 63 publications

(36 citation statements)

References 60 publications

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“…CAT2 mRNA is most abundant in leaves and is found in all green (photosynthesizing) organs. CAT2 also exhibits a circadian rhythm in mRNA abundance with peak abundance during the early subjective morning (Zhong et al, 1994), as is seen with photosynthetic genes such as CAB (Kay and Millar, 1993;Piechulla, 1993;McClung and Kay, 1994), RBCS (McClung, 1993), and RCA (Martino-Catt and Ort, 1992;Pilgrim and McClung, 1993;Watillon et al, 1993). Photosynthetic capacity itself peaks in the subjective morning (Sweeney, 1987).…”

Section: Rlbsfcmentioning

confidence: 99%

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

et al. 1996

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The catalase multigene family in Arabidopsis includes three genes encoding individual subunits that associate to form at least six isozymes that are readily resolved by nondenaturing gel electrophoresis. CATl and CAT3map to chromosome 1 , and CAT2maps to chromosome 4. The nucleotide sequences of the three coding regions are 70 to 72% identical. The amino acid sequences of the three catalase subunits are 75 to 84% identical and 87 to 94% similar, considering conservative substitutions. Both the individual isozymes and the individual subunit mRNAs show distinct patterns of spatial (organ-specific) expression. Six isozymes are detected in flowers and leaves and two are seen in roots. Similarly, mRNA abundance of the three genes varies among organs. All three mRNAs are highly expressed in bolts, and CAT2 and CAT3 are highly expressed in leaves.

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Section: Rlbsfcmentioning

confidence: 99%

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

et al. 1996

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“…Underlying the physiological rhythms, genes encoding diverse enzymes or regulatory and structural proteins show circadian rhythm in their expression (Johnson et al, 1984;Piechulla, 1993). However, a few genes at a time were characterized until two groups, using microarrays, each representing around 8,000 Arabidopsis (Arabidopsis thaliana) genes, gave a global idea of clockcontrolled genes (Harmer et al, 2000;Schaffer et al, 2001), thus confirming that many genes involved in photosynthetic processes and in carbon allocation are circadian regulated.…”

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confidence: 99%

Circadian Rhythms of Isoprene Biosynthesis in Grey Poplar Leaves

et al. 2006

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Isoprene (2-methyl-1,3-butadiene) emission varies diurnally in different species. In poplar (Populus spp.), it has recently been shown that the gene encoding the synthesizing enzyme for isoprene, isoprene synthase (ISPS), displays diurnal variation in expression. Working on shoot cultures of Grey poplar (Populus 3 canescens) placed under a different light regime in phytochambers, we showed that these variations in PcISPS gene expression, measured by quantitative real-time polymerase chain reaction, are not only due to day-night changes, but also are linked to an internal circadian clock. Measurement of additional selected isoprenoid genes revealed that phytoene synthase (carotenoid pathway) displays similar fluctuations, whereas 1-deoxy-D-xylulose 5-phosphate reductoisomerase, possibly the first committed enzyme of the 1-deoxy-D-xylulose 5-phosphate pathway, only shows light regulation. On the protein level, it appeared that PcISPS activity and protein content became reduced under constant darkness, whereas under constant light, activity and protein content of this enzyme were kept high. In contrast, isoprene emission rates under continuous irradiation displayed circadian changes as is the case for gene expression of PcISPS. Furthermore, binding assays with Arabidopsis (Arabidopsis thaliana) late elongated hypocotyl, a transcription factor of Arabidopsis involved in circadian regulation, clearly revealed the presence of circadian-determining regulatory elements in the promoter region of PcISPS.

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“…This [Ca 2ϩ ] c oscillation might play a role in the central oscillator mechanism, the phototransduction path, or in controlling circadian outputs. To test whether the [Ca 2ϩ ] c oscillation might control outputs, we focused on a well characterized circadian rhythm, namely, the rate of transcription of the light-harvesting complex (Lhc)b gene family (7)(8)(9)(10), for which there is evidence of [Ca 2ϩ ] c control of transcription (11,12). Transgenic plants have been developed by using a luciferase reporter fused to the promoter of one of the Lhcb genes (Lhcb::Luc) that enables continuous precise recording of the promoter activity (7,8,10).…”

mentioning

confidence: 99%

Different circadian oscillators control Ca ²⁺ fluxes and Lhcb gene expression

Sai

Johnson

1999

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

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Circadian biological clocks control many biological events, but the pathways by which these events are controlled are largely unknown. Based on a model suggesting that cytosolic-free calcium levels control the expression of the Lhcb gene in plants, we tested whether the circadian oscillation of free calcium is responsible for driving the rhythm of Lhcb expression. We found that these rhythms free-run with different periods in tobacco seedlings in constant conditions. Moreover, robust oscillations of Lhcb promoter activity continued in undifferentiated tobacco calli in the absence of Ca 2؉ oscillations. Therefore, these two circadian rhythms are not linked hierarchically. These data provide evidence for separate circadian pacemakers controlling molecular events in plants.

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?Circadian clock? directs the expression of plant genes

Cited by 63 publications

References 60 publications

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

Circadian Rhythms of Isoprene Biosynthesis in Grey Poplar Leaves

Different circadian oscillators control Ca ²⁺ fluxes and Lhcb gene expression

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?Circadian clock? directs the expression of plant genes

Cited by 63 publications

References 60 publications

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

Catalase Is Encoded by a Multigene Family in Arabidopsis thaliana (L.) Heynh

Circadian Rhythms of Isoprene Biosynthesis in Grey Poplar Leaves

Different circadian oscillators control Ca 2+ fluxes and Lhcb gene expression

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Different circadian oscillators control Ca ²⁺ fluxes and Lhcb gene expression