Our understanding of plant circadian rhythms has been advanced by two papers investigating the roles of the transcription factors CCA1 and LHY in the circadian oscillator.
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Light responses during early day phases of CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and PSEUDO-RESPONSE REGULATOR (PRR) homologous genes in the moss Physcomitrium patens.
Photochem Photobiol
December 2024
Graduate School of Informatics, Nagoya University, Nagoya, Japan.
Circadian clocks facilitate organisms' adaptation to the day-night environmental cycle. Some of the component genes of the clocks ("clock genes") respond directly to changes in ambient light, supposedly allowing the clocks to synchronize to and/or oscillate robustly in the environmental cycle. In the dicotyledonous model plant Arabidopsis thaliana, the clock genes CIRCADIAN CLOCK ASSOCIATED 1 (CCA1), LATE ELONGATED HYPOCOTYL (LHY) and PSEUDO-RESPONSE REGULATOR 9 (PRR9) show transient expression in response to the morning light.
View Article and Find Full Text PDFThe circadian clock regulates receptor-mediated immune responses to an herbivore-associated molecular pattern.
bioRxiv
November 2024
Department of Biology, University of Washington, Seattle, WA, USA.
Plants activate induced defenses through the recognition of molecular patterns. Like pathogen-associated molecular patterns (PAMPs), herbivore-associated molecular patterns (HAMPs) can be recognized by cell surface pattern recognition receptors leading to defensive transcriptional changes in host plants. Herbivore-induced defensive outputs are regulated by the circadian clock, but the underlying molecular mechanisms remain unknown.
View Article and Find Full Text PDFThe BBX7/8-CCA1/LHY transcription factor cascade promotes shade avoidance by activating PIF4.
New Phytol
January 2025
State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, National Center for Soybean Improvement, College of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China.
Article Synopsis
- Sun-loving plants adapt to low light by triggering shade avoidance syndrome (SAS), which is primarily mediated by phytochrome B (phyB) sensing shading signals.
- The conversion of phyB to its inactive form causes an increase in PHYTOCHROME INTERACTING FACTOR 4 (PIF4), which promotes plant growth.
- Research shows that B-box PROTEIN 7 (BBX7) and BBX8, along with CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY), work together to enhance PIF4 expression, prompting growth in shaded conditions.
Decoding the plant clock: a review of mathematical models for the circadian regulatory network.
Plant Mol Biol
August 2024
Department of Biological Sciences and Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat, India.
Most organisms have evolved specific mechanisms to respond to changes in environmental conditions such as light and temperature over the course of day. These periodic changes in the physiology and behaviour of organisms, referred to as circadian rhythms, are a consequence of intricate molecular mechanisms in the form of transcription and translational feedback loops. The plant circadian regulatory network is a complex web of interconnected feedback loops involving various transcription factors such as CCA1, LHY, PRRs, TOC1, LUX, ELF3, ELF4, RVE8, and more.
View Article and Find Full Text PDFTwilight length alters growth and flowering time in Arabidopsis via /.
Sci Adv
June 2024
Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada.
Decades of research have uncovered how plants respond to two environmental variables that change across latitudes and over seasons: photoperiod and temperature. However, a third such variable, twilight length, has so far gone unstudied. Here, using controlled growth setups, we show that the duration of twilight affects growth and flowering time via the clock genes in the model plant Arabidopsis.
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