Recent Posts

Shade avoidance or shade tolerance? The balancing act of PIF-HFR1 module (EMBO J.)

Plants have evolved two major adaptive strategies to tackle shade from their neighbours: avoidance and tolerance. However, what makes a species shade-avoider or shade-tolerant at the molecular level has remained mostly elusive. Recently, Paulisic et al. uncovered the key role of a regulatory module formed…

A novel GUN1-independent retrograde signaling pathway represses photomorphogenesis (Plant Physiol.)

Seedlings emerging in light undergo photomorphogenic development, forming short hypocotyls and green, fully opened cotyledons. Disruption of chloroplast development by drugs such as lincomycin induces retrograde signals (RS) that inhibit photomorphogenesis. The retrograde signaling pathway has been known…

SAURs protein antagonistically regulate a phosphatase activity during apical hook development and cotyledon opening (Plant Cell)

Upon germination in dark, plants adopt a strategy known as skotomorphogenesis, or etiolation, to protect the shoot apical meristem and cotyledon from damage while the seedling moves through the soil. The seedlings de-etiolate when they perceive light and the apical hook and cotyledon open. Wang et…

A constitutively monomeric UVR8 photoreceptor allele confers enhanced UV-B photomorphogenesis (bioRxiv)

In response to UV-B light, the plant UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8) monomerizes and activates, inducing UV-B acclimation and survival. Re-dimerization by REPRESSOR OF UV-B PHOTOMORPHOGENESIS 1 (RUP1) and RUP2 inactivates UVR8. In order to further clarify UVR8 pathway regulation, Podolec…

Post germination seedling establishment by ABA in response to light (Plant J.)

Abscisic acid (ABA), is implicated in reversible inhibition of seed germination (emergence of radicle) and post-germination seedling establishment (formation of green open cotyledons) during unfavorable conditions. Yadukrishnan et al. analyzed the role of light in ABA- mediated inhibition of post germination…

Review: The bHLH network underlying plant shade-avoidance (Physiol. Plant.)

Shade avoidance is a complex phenomenon in which plants avoid shade by altering their developmental program in various ways including early flowering, hypocotyl elongation, and more. Many photoreceptors and transcription factors (TFs) are involved in regulating shade avoidance, including the bHLH (basic…

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…

How Light Activates the Plant Circadian Clock

Liu et al. discover how members of the photosensory-signaling pathway orchestrate circadian clock gene expression to regulate plant responses to daily changes in the light environment. Plant Cell https://doi.org/10.1105/tpc.19.00981  Background: Plants use an endogenous time-keeping mechanism known…

A molecular link between photoreceptors and jasmonates (Nature Plants)

Plants balance their efforts on growth and defense depending on the situation. Competitive conditions signaled by the low ratios of red (R) to far-red (FR) light suppress defense responses mediated by the plant hormone jasmonate (JA), presumably for allocating more resources to promote plant growth.…