Year: 2022

NIGHT BREAKS. "Responsiveness to night breaks was rhythmic in short day species and oscillated with a period of approximately 24 h. Results obtained with long day plants also supported this model, but suggested that the characteristics of the interaction of light and circadian rhythms were not the same in short day plants and long day plants." https://lnkd.in/d_f7kfY View in LinkedIn

DUSK SIGNAL. "Short day plants often exhibit a qualitative requirement for inductive photoperiods and can frequently be induced to flower in response to a single inductive light–dark cycle. In such plants the circadian rhythm of responsiveness to night breaks is entrained by the dusk signal, so that the photoinducible phase always occurs at about the same time in darkness." https://lnkd.in/d_f7kfY View in LinkedIn

SENSITIVE WINDOW. "Light received during the photoinducible phase (dawn or an night break) prevents the short day response. Thus it is easy to think that the circadian rhythm in light sensitivity provides the timing base that allows the length of the dark period to be distinguished by the plant." https://lnkd.in/d_f7kfY View in LinkedIn

REDUCED SENSITIVITY. "For long day plants or light-dominant plants the situation is not quite as straightforward. Because sensitivity to night breaks is much reduced, it is very difficult to do night break experiments. Rhythms in response to an night break have been described in the long day plants but the pattern of response varies with the duration of the experimental dark period suggesting an interaction with the subsequent light period." https://lnkd.in/d_f7kfY View in LinkedIn

FAR-RED LIGHT. "A circadian rhythm in light sensitivity in constant light can be seen when far-red light is added to a background of white fluorescent or red light indicating that the rhythm in light sensitivity continues to run in constant light." https://lnkd.in/d_f7kfY View in LinkedIn

MUTANTS. "Abnormal function of the circadian clock in Arabidopsis mutants was correlated with defective floral responses to photoperiod. For example, the short-period mutant timing of cab 1-1 (toc1-1) flowered earlier than wild-type under short day conditions, whereas the long-period mutant zeitlupe (ztl) exhibited delayed flowering under long day conditions." https://lnkd.in/d_f7kfY View in LinkedIn

ENTRAINMENT. "One of the fundamental properties of the circadian clock is that it will advance or delay its phase (that is, shift its rhythm forward or back relative to dawn and dusk) when entrained to light–dark cycles that are either longer or shorter than 24 h, respectively." https://lnkd.in/d_f7kfY View in LinkedIn

MIND GAMES. "When Arabidopsis plants were exposed to a range of these atypical light–dark cycles, floral responses were not determined by the number of light or dark hours within a cycle but reflected how much transcription of the clock-controlled gene CO coincided with light." https://lnkd.in/d_f7kfY View in LinkedIn

CLOCK GENE CO. "These results were consistent with a model in which expression of CO under the control of the circadian clock mediates rhythmic changes in photoresponsiveness and perception of external coincidence with light." https://lnkd.in/d_f7kfY View in LinkedIn

CLOCK CENTRAL. "In plants, the circadian clock controls expression of approximately 6% of the transcriptome. This includes genes encoding components of all major metabolic pathways as well as genes involved in hormone biosynthesis, photoreceptors and floral regulators such as CO, FT and GI." https://lnkd.in/d_f7kfY View in LinkedIn