SPPS is the Scandinavian Plant Physiology Society: conferences, grants and support for plant scientists across the Nordic region. We also own the journal Physiologia Plantarum (PPL). SPPS is working o...

Auxin and calcium (Ca2+) are central plant signals that coordinate growth, development, and responses to environmental cues. Typically studied as largely parallel pathways, they are now increasingly recognized as interconnected networks whose activities converge at multiple regulatory levels. Recent advances in live imaging, biosensors, optogenetics, and structural approaches have revealed that auxin can rapidly trigger Ca2+ influx from the apoplast via TRANSPORT INHIBITOR RESPONSE1 (TIR1)/AUXIN-SIGNALING F-BOX (AFB)-dependent signaling mechanisms and Ca2+ channels, presumably involving cyclic nucleotides produced by TIR1/AFB auxin receptors. Conversely, Ca2+ signals arising from mechanosensing, wounding, and environmental stress can modulate auxin transport, signaling, and transcriptional outputs. Together, these discoveries highlight a dynamic, reciprocal signaling axis where Ca2+ acts both downstream and upstream of auxin to shape growth, development, tropisms, and regeneration.

Auxin and calcium (Ca2+) are central plant signals that coordinate growth, development, and responses to environmental cues. Typically studied as largely parallel pathways, they are now increasingly r...

Erdrich et al. investigated the molecular interplay underlying bacteriophage-based biocontrol, using natural bacterial viruses for plant protection. They uncovered that phage-treated plants maintain b...

Embryogenesis in the model plant Arabidopsis thaliana provides a framework for understanding how cell polarity and patterning coordinate with hormonal signalling to establish the plant body plan. Fol...

All organisms fuel and build themselves through their energy metabolism. While classic biochemistry conceptualizes the fluxes of energy and matter, our understanding of how energy metabolism works in ...

OR: the long overdue forest fire

Hou et al. engineer plant endophytes to express effectors that trigger NLR-mediated ETI upon pathogen infection, regardless of whether pathogens carry recognizable effectors. The sentinel bacterium ma...

Science isn’t really moving towards equity; institutions are just perfecting the appearance of equity. We need to build an alternative system.

Plant cell expansion is regulated by hormones and driven by turgor pressure, which stretches the cell wall and can potentially cause wall damage or ru…