| 1. |
- Johansson, Mikael, 1981-, et al.
(författare)
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Partners in time : early bird associates with zeitlupe and regulates the speed of the arabidopsis clock
- 2011
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Ingår i: Plant Physiology. - : Oxford University Press (OUP). - 0032-0889 .- 1532-2548. ; 155:4, s. 2108-2122
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Tidskriftsartikel (refereegranskat)abstract
- The circadian clock of the model plant Arabidopsis (Arabidopsis thaliana) is made up of a complex series of interacting feedback loops whereby proteins regulate their own expression across day and night. early bird (ebi) is a circadian mutation that causes the clock to speed up: ebi plants have short circadian periods, early phase of clock gene expression, and are early flowering. We show that EBI associates with ZEITLUPE (ZTL), known to act in the plant clock as a posttranslational mediator of protein degradation. However, EBI is not degraded by its interaction with ZTL. Instead, ZTL counteracts the effect of EBI during the day and increases it at night, modulating the expression of key circadian components. The partnership of EBI with ZTL reveals a novel mechanism involved in controlling the complex transcription-translation feedback loops of the clock. This work highlights the importance of cross talk between the ubiquitination pathway and transcriptional control for regulation of the plant clock.
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| 2. |
- Johansson, Mikael, et al.
(författare)
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Partners in time: EARLY BIRD reveals novel regulatory function of ZEITLUPE in the Arabidopsis clock
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The circadian clock of the model plant Arabidopsis thaliana is made up of acomplex series of interacting feedback loops whereby proteins regulate their ownexpression across day and night. early bird (ebi) is a circadian mutation that causesthe clock to speed up: ebi plants have short circadian periods, early phase of clockgene expression and are early flowering. We show that EBI associates with ZEITLUPE (ZTL), known to act in the plant clock as a post-translational mediator of protein degradation. However, EBI is not degraded by its interaction with ZTL. Instead, EBI acts in opposition to ZTL, modulating the expression of key circadiancomponents. The partnership of EBI with ZTL reveals a novel mechanism involved incontrolling the complex transcription-translation feedback loops of the clock. Thiswork highlights the importance of cross-talk between the ubiquitination pathway andtranscriptional control for regulation of the plant clock
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| 3. |
- McWatters, Harriet G, et al.
(författare)
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Plant Circadian Rhythms
- 2007
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Ingår i: eLS. - Chichester : John Wiley & Sons. - 9780470015902
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Circadian clocks are found in most eukaryotic organisms. By allowing anticipation of daily and seasonal changes they enable coordination of metabolism and life cycle with the natural rhythms of the environment. Plant circadian rhythms are generated by a series of interlocking feedback loops of ribonucleic acid (RNA) and protein expression that respond to environmental cycles of light and temperature. They control essential processes in the plant’s development, such as the transition to flowering or growth cessation.
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| 4. |
- McWatters, Harriet G
(författare)
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Plant Circadian Rhythms
- 2016
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Ingår i: Encyclopedia of Life Sciences. - Chichester : John Wiley & Sons. ; , s. 1-10
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Bokkapitel (refereegranskat)abstract
- Circadian clocks are found in most eukaryotic organisms. By allowing anticipation of daily and seasonal changes, they enable coordination of metabolism and lifecycle with the natural rhythms of the environment. Plant circadian rhythms are generated by a series of interlocking feedback loops of RNA (ribonucleic acid) and protein expression that respond to environmental cycles of light and temperature. They control essential processes in the plant's development, such as the transition to flowering or growth cessation, and thus influence yield, plant growth and biomass production. Many components of the clock are conserved across a wide variety of plant species and thus research in Arabidopsis translates into an understanding of the clock in agricultural crops or long‐living deciduous tree species such as hybrid aspen.Key ConceptsCircadian clocks are found in both eukaryotes and bacteria.Circadian clocks have a free‐running periodicity of about 24 h but are normally entrained to environmental cycles of light and temperature.Temperature compensation is a key feature of the circadian clock and thus the free‐running period length varies relatively little across the range of ambient temperature.The clock underlies many aspects of plant metabolism and physiology because it can detect and respond to both short‐term (the day:night cycle) and long‐term (the pattern of daylength variation across a year) changes in light and temperature.The circadian clock of plants is made up of a series of interconnected transcription‐translation feedback loops (TTFLs) governing cycles of mRNA and protein expression.Every plant cell contains its own clock. Clocks in different cells may be entrained independently of one another, although there appears to be a hierarchy of clocks within a plant dominated by the apex.Plants with malfunctioning clocks suffer reductions in growth.Many of the key components of the plant clock first described in the model species Arabidopsis thaliana are conserved across a wide range of species including trees such as hybrid aspen.
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