Recent Posts

Two novel repressors of photomorphogenesis act downstream of HY5 in Arabidopsis (Plant Physiol)

Higher plants rely on a sophisticated photo-sensory system to cope with the vast variety of environmental stimuli. Under light conditions, young seedlings display photomorphogenic development to maxize the usage of light. Recently, YQ Heng et al. discovered two B-box containing proteins, BBX30 and BBX31,…

Chloroplast status can affect shade avoidance in plants ($) (Plant Cell)

For optimal photosynthetic performance, plants utilize multiple strategies to compete with their neighbors. Especially when light supply is limited in the canopy, plants promote their own elongation to overgrow neighboring plants. This occurs as a response to a low ratio of Red to Far-Red light (R/FR),…

Pivotal roles of cryptochromes 1a and 2 in tomato development and physiology (Plant Phys)

Cryptochromes are a class of flavoproteins found in plants and animals that are sensitive to blue light. In Arabidopsis, cryptochromes are involved in many important physiological processes including de-etiolation, flowering, circadian rhythms, cotyledon opening and expansion, anthocyanin accumulation,…

BBX28 Negatively Regulates Photomorphogenesis

Lin et al. show that B-BOX DOMAIN PROTEIN28 plays a role in regulating plant development in response to light signals. Plant Cell https://doi.org/10.1105/tpc.18.00226. By Dongqing Xu and Xing Wang Deng Background: Sunlight is one of the key environmental cues influencing plant growth and development.…

Dark-Induced Nuclear Positioning in Leaf Cells

The appropriate spatial arrangement of nuclei is essential for various cellular activities during cell division, growth, migration, and differentiation in eukaryotes. In plants, nuclear positioning is also required for proper responses to environmental stimuli, including pathogen infection, touch, temperature,…

Leaf development in canopy shade (J. Exp. Bot)

Vegetative shade affects the ratio of red (R) and far-red (FR) light; relative to sunlight, the R/FR ratio is decreased due to absorbance of photosynthetically-active R light by other leaves. Low R/FR ratios cause increased elongation of shaded plant stems and petioles, as the plants strive to raise…

Integrated regulation of apical hook development by EIN3/EIL1 and PIFs ($) (Plant Cell)

The apical hook helps to protect the fragile cotyledons and shoot apical meristem while pushing through the soil, and hook angle determines the success of emergence from soil. Multiple hormones and light signals have contrasting roles in the regulation of hook formation; e.g., auxin, ethylene and gibberellic…

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…

Suns out, guns out: Plant defense responses are enhanced under long-day photoperiods ($)

As sessile organisms, plants must constantly sense and respond to a dynamic range of stimuli in their environment, which includes both the duration of light (photoperiod) and the presence of microbial invaders. In a recent article published in Plant Physiology, Cagnola et al. (2018) investigate how plant…