Recent Posts

Nanoscale movements of cellulose microfibrils in primary cell walls ($)

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Cell walls are complex mixtures of cellulose microfibrils, proteins and other materials. Their mechanical properties can be measured and modeled, but it is not always simple to translate these measurements to changes at the molecular level. Zhang et al. used atomic force microscopy to provide an unprecedented…

True Blue: How Cry1 Inhibits Phototropism in Green Seedlings

Kasper van Gelderen Plant Ecophysiology, Dept. of Biology, Utrecht University, Padualaan 8 3584CH, Utrecht, The Netherlands. The study of plant movement towards light, also called phototropism, has a venerable history with giants such as Charles Darwin and Frits Went involved in its study, which…

How COR27 and COR28 Promote Hypocotyl Growth: Bind to COP1 And Suppress HY5 Activity

Seedling growth and development rely on the successful integration of information from external signals, such as light and temperature, and endogenous processes, such as the rhythmic ticking of the circadian clock. Together, these signaling pathways tune hypocotyl elongation to allow seedlings to escape…

MYB30 Regulates Photomorphogenesis via Interactions with Active Phytochromes and PIFs

MYB proteins are a group of transcription factors that are highly conserved in all vertebrates and were first implicated in avian myeloblastosis (leukemia). Subsequently, they were shown to be cellular proto-oncogenes that regulate production of blood cells in animals. MYB proteins contain a DNA-binding…

MYB30 negatively regulates photomorphogenesis by interacting with PIFs and phytochromes in Arabidopsis (Plant Cell)

Photomorphogenesis is the growth and development of plants in response to light. The phytochrome family of photoreceptors absorbs red and far-red light, and in Arabidopsis the most abundant phytochromes are phyA and phyB. PHYTOCHROME-INTERACTING FACTORS (PIFs) repress photomorphogenesis, and under red…

Coordinated regulation of pre-mRNA splicing by the SFPS-RRC1 complex to promote photomorphogenesis ($) (Plant Cell)

Phytochromes are a family of red/far-red light photoreceptors, which positively regulate photomorphogenesis upon red-light perception. Photomorphogenesis is driven by light-induced global transcriptional reprogramming, of which phytochromes are one of the most important regulators. In addition to transcriptional…

A phyB-PIF1-SPA1 kinase regulatory complex promotes photomorphogenesis in Arabidopsis (OA) (Nature Communications)

CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is one of the best characterized E3 ubiquitin ligases with broad roles as a central repressor of light signaling in plants to cancer biology in mammals. In plants, COP1 interacts with SUPPRESSOR OF PHYA-105 1 family members (SPA1-SPA4) and forms a stable COP1/SPA…

Arabidopsis PP6 phosphatases dephosphorylate PIF proteins to repress photomorphogenesis (PNAS)

In the absence of light, plants undergo skotomorphogenesis, characterized by longer hypocotyls, closed and yellowish cotyledons, and apical hooks. in the presence of light, they undergo photomorphogenesis, with inhibited hypocotyl elongation, and open and expanded green cotyledons. Light also modulates…

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,…

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.…