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CYCLE REGULATOR. "Rhythmic transcription of CO under the control of the circadian clock provides the basis for rhythmic responsiveness to light in photoperiodism, since the effects of CRY2 and PHYA on CO protein accumulation can take place only when the CO mRNA is expressed and actively translated." https://lnkd.in/d_f7kfY View in LinkedIn

RED VS BLUE LIGHT SIGNALS. "Under natural conditions of white light where all of these photoreceptors are stimulated at the same time, the balance between the activity of these different pathways must determine the floral response. This is in good agreement with mutant analyses, which suggested that far-red light acting through PHYA and blue light acting through CRY1 and CRY2 may act to antagonize the repression of flowering mediated by PHYB." https://lnkd.in/d_f7kfY View in LinkedIn

DARK INHIBITION. "The protein does not accumulate when expression of the CO transcript takes place in darkness and FT transcription is not induced. Accumulation of the CO protein is promoted under monochromatic far-red and blue light by the action of PHYA- and CRY2-mediated pathways, respectively, but is prevented in red light via a PHYB-dependent pathway." https://lnkd.in/d_f7kfY View in LinkedIn

CIRCADIAN GENE "CO directly activates transcription of the floral integrators FT and SOC1, but only when expression of its mRNA coincides with the light period under long day conditions. This is because the CO protein is subject to post-transcriptional regulation and is ubiquitinated and degraded by the 26S proteasome in the dark." https://lnkd.in/d_f7kfY View in LinkedIn

VERNALIZATION. "Two floral-enabling pathways result in the downregulation of the FLC repressor, the vernalization pathway and the autonomous pathway. Vernalization, resulting from exposure to low temperatures (between 08C and 108C), is a quantitative response and causes progressive downregulation of the FLC gene until the response is saturated after several weeks." https://lnkd.in/d_f7kfY View in LinkedIn

CLOCK GENE. "One of the genes whose expression is under control of the circadian clock is CO, which is a key regulator of the photoperiodic pathway. The rhythmic expression of CO cycles such that low levels of transcripts are observed during the day. Expression begins to increase approximately 8 h after dawn, followed by a broad peak between 12 and 16 h after dawn." https://lnkd.in/d_f7kfY View in LinkedIn

PATHWAY CROSSROADS. "Expression of the floral-integrator genes is actively repressed by the floral inhibitor FLOWERING LOCUS C (FLC). Consequently flowering is prevented until this repression is lifted by the floral-enabling pathways, thus allowing activation of the floral-pathway integrators by the floral-promotion pathways." https://lnkd.in/d_f7kfY View in LinkedIn

PHYTOCHROMES. "Different phytochromes have different roles in controlling plant development and this is the case for the photoperiodic-perception process." https://lnkd.in/d_f7kfY View in LinkedIn

PATHWAY INTEGRATORS. "All the different flowering pathways converge on a small group of genes called floral-pathway integrators. These genes are FLOWERING LOCUS T (FT), LEAFY (LFY) and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1), and they are responsible for the activation of the floral meristem identity genes that direct floral organ formation." https://lnkd.in/d_f7kfY View in LinkedIn

SIGNAL DISRUPTION. "Mutants or transgenic plants in which chromophore biosynthesis is impaired will be incapacitated with regard to all of the functional phytochromes. Such plants show altered daylength responses, usually flowering earlier than wild type." https://lnkd.in/d_f7kfY View in LinkedIn