Recent Posts

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…

Genome-wide excision repair in Arabidopsis is coupled to transcription and reflects circadian gene expression patterns (Nature Comms)

Exposure to ultraviolet radiation and numerous other factors can cause mispairing of the nucleotides in the DNA, compromising genome integrity. Luckily, plants employ excision repair systems to recognize and repair such DNA damage. Oztas et al. examined the dynamics of such a repair system by using excision…

How Plants Clear Toxic Proteins

Gil et al. explore ZTL-mediated protein quality control https://doi.org/10.1105/tpc.17.00612 By Kyung-Eun Gil Background: As sessile organisms, plants have evolved various mechanisms to adapt to environmental changes. Under stressful conditions such as high temperatures, proteins are misfolded…