Recent Posts

Multi-level modulation of light signaling by GIGANTEA regulates both the output and pace of the circadian clock ($) (Devel Cell)

The daily cycle of light and dark controls many facets of plant growth and development, but these cycles depend on and are most efficient when integrated with the rhythms of the circadian clock. Nohales et al. have identified a key mechanism that directly links the regulation of light-responsive genes…

Oscillating aquaporin phosphorylations and 14-3-3 proteins mediate circadian regulation of leaf hydraulics (Plant Cell)

Plant activities change drastically between the light and dark times of day. Many of these different activities can be observed through transcriptional studies, which show that gene expression goes up and down over the course of the day. Many of these transcriptional changes are driven by the circadian…

Dawn and photoperiod sensing by phytochrome A ($) (PNAS)

Plants perceive the change of seasons based on measuring the duration of daylight. Flowering is a major seasonal response that depends on photoperiod. In this study, Seaton et al. looked at the role of phytochrome A (phyA) in photoperiod sensing. PHYA is the direct target of PIF4 and PIF5 transcription…

Flowering time in the real world (Nature Plants)

There are pros and cons to growing plants in controlled conditions. On the one hand, controlling light, temperature, humidity and other environmental factors should aid reproducibility between experiments and labs. But what if the conditions used profoundly and unexpectedly affect the process you are…

Circadian oscillations of cytosolic free calcium regulate the Arabidopsis circadian clock (Nature Plants)

The circadian rhythm confers competitive advantages by coordinating the physiology and behavior of biological systems. The internal clock in eukaryote organisms comprises feedback loops, and in Arabidopsis most of them involve negative transcriptional regulation events as well as post-transciptional,…

How Plants Generate Circadian Rhythms in Transcription

Ma et al. investigate a protein complex that controls steady-state mRNA circadian oscillations  https://doi.org/10.1105/tpc.18.00052  By Yuan Ma, Sergio Gil, Klaus D. Grasser and Paloma Mas Background: Circadian clocks are internal time-keeping mechanisms that help organisms to adapt to the…

New Insights into the Molecular Biology of Plant Circadian Rhythms

The circadian clock is an endogenous timekeeper that synchronizes essential biological processes with the outside world. Eukaryotic clocks rely on the ubiquitin proteasome system to target core clock factors for degradation. Altering clock protein degradation can change the period length of the clock.…

Decoys untangle complicated redundancy and reveal targets of circadian clock F-box proteins (Plant Physiol)

The processing of the circadian clock requires that regulatory proteins are ubiquitinated and degraded, through their interactions with F-box proteins. Lee et al. used a decoy strategy to characterize the targets of three related F-box proteins involved in clock function, ZTL, LKP2 and FKF1, which genetic…

Genes responsible for deceleration of circadian rhythms during tomato domestication (PNAS)

Domestication of crop plants is intimately linked to the modulation of the plants circadian rhythms, allowing adaptation to new agricultural environments. Deceleration of the clock has been instrumental in tomato domestication; however the underlying molecular mechanisms are not fully understood. In…