Recent Posts

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…

Identification of calmodulin-dependent NAD+ kinase that sustains the elicitor-induced oxidative burst (Plant Phys)

When pathogens attack, one line of defense is the production of a burst of reactive oxygen species (ROS) which triggers additional defences. ROS is produced by the action of NADPH oxidases, which require NADPH as a substrate; NADPH is derived from NADP+, but where does this come from? Previous studies…

Two bifunctional inositol pyrophosphate kinases/phosphatases control plant phosphate homeostasis (eLIFE)

Phosphorus (P) is an essential macronutrient for plant growth and development. P is predominantly absorbed by plants in its inorganic form, phosphate (Pi). Because Pi homeostasis is critical for balanced growth and development, plants like many other eukaryotic organisms have developed a complex system…

Ethylene-mediated nitric oxide depletion pre-adapts plants to hypoxia stress (Nature Comms)

Climate projection models predict an increasingly wetter world with frequent and severe flooding events, causing loss of crops. As it is for other organisms, it is a challenge for plants to stay under water for long periods. However, how plants react to submergence is poorly understood. Environmental…

COP1 can be hijacked by photoreceptors via their VP motifs (EMBO J)

Plant development is characterized by a high degree of plasticity in response to light. Light‐activated plant photoreceptors bind and inhibit the E3 ubiquitin ligase COP1, thus protecting downstream transcription factors from degradation. However, the detailed mechanisms of how COP1 can function between…

A calmodulin-gated calcium channel links pathogen patterns to plant immunity ($) (Nature)

Calcium ions mediate calcium-based defense responses in pattern triggered immunity (PTI) upon detection of pathogen patterns by plant surface receptors. A new study by Tian et al. has elucidated the molecular events that activate the calcium response. The authors show that adequeate calcium nutrient…

Recognition of sequence-divergent CIF peptides by the plant receptor kinases GSO1/SGN3 and GSO2 (bioRxiv)

SCHENGEN 3 [SGN3, also known as GASSHO1 (GSO1)] is a leucine-rich repeat receptor kinase (LRR-RK) previously shown to interact with CIF peptides (CASPARIAN STRIP INTEGRITY FACTORS) to regulate the development of the Casparian strip boundary in roots. Here, Okuda et al. characterize the CIF/LRR-RK interaction.…

Structural basis for recognition of RALF peptides by LRX proteins during pollen tube growth (bioRxiv)

RALFs (Rapid Alkalinization Factors, based on historical observations that they induce alkalization of the extracellular space) are signaling peptides with diverse roles. RALF4 is required for pollen tube growth and guidance through its interactions with CrRLK1Ls and leucine-rich extension (LRX) proteins.…

Mechanisms of RALF peptide perception by a heterotypic receptor complex (Nature) ($)

RALFs (Rapid Alkalinization Factors, based on historical observations that they induce alkalization of the extracellular space) are signaling peptides with diverse roles. RALFs have previously been shown to bind to the extracellular domain of (among others) FERONIA (FER), a member of the Catharanthus…