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Steven Zwartkruis

@stevenzwartkruis.bsky.social
56 followers 101 following 8 posts

PhD student in plant science at NTNU in Trondheim, Norway.

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Reposted by Steven Zwartkruis
cryoEM papers @cryoempapers.bsky.social · 02/08/2026
A molecular description of plant cellulose biosynthesis inhibition pubmed.ncbi.nlm.nih.gov/42539162/ #cryoEM
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Reposted by Steven Zwartkruis
Maurice König @maukoe.bsky.social · 15/05/2026
One highlight from our review: peptide signals can be copied or rerouted to redirect plant responses. 🌱 Bacteria, fungi and nematodes tap into phytocytokine pathways via mimics or altered release - steering infection, colonization and symbiosis. Read more about it here: doi.org/10.1111/tpj....
doi.org
Processing and release of endogenous immunogenic peptide signals
Plant endogenous peptides, termed phytocytokines, coordinate immune responses and mediate intercellular communication within and across plant tissues. While an expanding repertoire of ligands, recept...
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Reposted by Steven Zwartkruis
Luis Alonso Baez @luisalonsobaez.bsky.social · 18/02/2026
Our work now on its final version. We mapped the mechanical properties of roots at tissue and single cell levels using Brillouin microscopy and molecular rotors. Additional mutants and stress measurements from what we previously showed in the preprint are included. www.science.org/doi/10.1126/...
science.org
The mechanical properties of Arabidopsis thaliana roots adapt dynamically during development and to stress
Brillouin microscopy reveals in vivo dynamics of mechanical properties during plant development and response to stress.
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Steven Zwartkruis @stevenzwartkruis.bsky.social · 09/02/2026
1/7 Happy to share that the first publication from my PhD, in which we review the literature about THESEUS1, is now out in @theplantjournal.bsky.social ☘️: doi.org/10.1111/tpj....
doi.org
The function of the Arabidopsis receptor kinase THESEUS1 in plant cell wall integrity maintenance: from evolutionary origin to future perspectives
THESEUS1 (THE1) is a receptor kinase for which many mutant phenotypes were described in relation to growth and stress responses in Arabidopsis. However, early signaling events by which these response...
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Reposted by Steven Zwartkruis
Journal of Experimental Botany @jxbotany.bsky.social · 24/11/2025
🪲 REVIEW 🪲 This review uncovers the critical role of the plant cell wall in pest defence, integrating structural, molecular, and genetic insights to highlight its emerging significance in plant–pest interactions during herbivory - Perez-Alonso et al. 🔗 doi.org/10.1093/jxb/... #PlantScience 🧪
Fig. 1.Schematic overview of pattern-triggered immunity (PTI) in plants upon pest infestation. Cell wall-degrading enzymes (CWDEs) secreted by herbivory disrupt cell wall integrity, releasing damage-associated molecular patterns (DAMPs). The defence response is activated by the recognition of these DAMPs, as well as herbivore-associated molecular patterns (HAMPs), by pattern recognition receptor complexes (PRRs and co-PRRs). Elicitor binding to PRRs leads to a series of signalling events, such as membrane depolarization (Vm), activation of Ca2+ channels and influx of Ca2+ into the cytosol, burst of reactive oxygen species (ROS) via activation of RBOHD, membrane depolarization, and activation of the mitogen-activated protein kinase (MAPK) cascade. MAPK and Ca2+-dependent kinase (CDPK) cascades trigger transcriptional reprogramming, activating phytohormone (SA, JA, and ET) signalling, transcription regulatory factors, and synthesis of defensive compounds.
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Reposted by Steven Zwartkruis
Journal of Experimental Botany @jxbotany.bsky.social · 22/11/2025
🌱 SPECIAL ISSUE REVIEW 🌱 Lu et al. review the cysteine-rich peptides RALF and EPF/EPFL, and their roles in regulating growth, development, immune responses and stress adaptation, highlighting new mechanistic insights and challenges in peptide research. 🔗 doi.org/10.1093/jxb/... #PlantScience 🧪
Fig. 1.The functional diversity of plant cysteine-rich peptide families, RALF, and EPF/EPFL in Arabidopsis. The representation of various growth and developmental roles of well-characterised functionally RALF and EPF members based on their expression in different Arabidopsis organs. EPF, Epidermal Patterning Factor; EPFL, EPF-Like; RALF, Rapid Alkalinization Factor.
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Reposted by Steven Zwartkruis
The EMBO Journal @embojournal.org · 20/11/2025
Christoph Ringli and collaborators identify a new regulator of the Arabidopsis extensin-mediated cell wall integrity sensing: phosphatase PP2C12 inhibiting receptor kinase FERONIA www.embopress.org/doi/full/10....
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Reposted by Steven Zwartkruis
Mariana Schuster @marischuster.bsky.social · 04/11/2025
Thrilled to share our latest review on receptor kinase processing in plants! 🌱 Huge congratulations to @adithya1972.bsky.social and Anna for leading this work, and a big thank you to our fantastic collaborator Martina-Ried Lasi for making this a truly rewarding team effort!
journals.plos.org
Shedding light on receptor kinase processing
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Reposted by Steven Zwartkruis
Chenxin Li, PhD @chenxinli2.bsky.social · 30/10/2025
What... There is an Arabidopsis gene called Lord of the Rings (AT5G50150). "LOTR1 protein has an unknown function. It contains both DUF4409 and DUF239 domains. Loss of function mutations show defects in formation of the Casparian band, which is correlated with mis-localization of CASP1. "
arabidopsis.org
TAIR - Arabidopsis
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Reposted by Steven Zwartkruis
Nature Plants @natplants.nature.com · 28/10/2025
"Plants have a secret language that scientists are only now starting to decipher" - Nature News feature @nature.com www.nature.com/articles/d41... Signals from the plant cell wall help to orchestrate growth, reproduction and immune function. Can we harness them to create better crops?
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Isabel Monte @isabelmonte.bsky.social · 09/10/2025
Fran @frangordilloc.bsky.social and I wrote this piece on one of our favorite topics: the evolutionary relevance of co-receptors for immune receptor transfer in #plants 🌱 #EvoMPMI #MPMI Check also the beautiful paper by Zhang et al. on the PRR STOMR and discover what happened to its co-receptor 😱
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Reposted by Steven Zwartkruis
Freddy Boutrot @freddyboutrot.bsky.social · 29/09/2025
A RALF-brassinosteroid signaling circuit regulates Arabidopsis hypocotyl cell shape doi.org/10.1016/j.cu...
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Reposted by Steven Zwartkruis
José Dinneny @josedinneny.bsky.social · 03/08/2025
Very proud to share our latest preprint: postdoc/LRSF fellow Yue Rui studies the mechanisms regulating attachment of the cell wall to the plasma membrane. The Cellulose Synthase Complex and REMORINs determine the extent of attachment and root osmotic stress tolerance. www.biorxiv.org/content/10.1...
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Reposted by Steven Zwartkruis
Luis Alonso Baez @luisalonsobaez.bsky.social · 01/08/2025
One of the key aspects influencing morphogenesis is mechanics. We mapped the mechanical properties of living roots at the tissue and cellular levels using Brillouin microscopy and molecular rotors. www.biorxiv.org/content/10.1...
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Reposted by Steven Zwartkruis
Carolyn Rasmussen @carolynplants.bsky.social · 29/07/2025
Interesting paper 👀 www.biorxiv.org/content/10.1...
biorxiv.org
WALLFLOWER, an Arabidopsis receptor-like kinase, is polarized in root epidermal cells where it represses cell elongation impacting root waving
Nutrient and water uptake relies on the ability of roots to grow through and explore the soil. When roots are grown on the surface of a substrate, growth occurs with an undulating trajectory known as ...
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Reposted by Steven Zwartkruis
Adrien Heymans @adrienheymans.bsky.social · 30/05/2025
🌱🧩 How do plant cells get their shape? 🧪 Check out the new #open-access #review exploring the mechanochemical duet between auxin & the cell wall in shaping diverse plant cell types from @srobertgroup.bsky.social's Lab. 🔗 doi.org/10.1111/ppl.... #PlantBiology #CellShape #Auxin #Biomechanics
Epidermal cells acquire different cell shapes to enable their functions and maintain tissue integrity in plants. Meristematic cells differentiate and expand into diverse mature cell types, including jigsaw puzzle-shaped pavement cells (a), round stomatal guard cells (b), elongated epidermal cells in hypocotyls and the apical hook (c), and root epidermal cells with root hairs (d). The spatial distribution and arrangement of cell wall polysaccharides, such as cellulose microfibrils, xyloglucans, and pectins (e.g., homogalacturonan represent as HG), and the abundance of methylester groups on these components in differentiating cells regulate anisotropy during cell growth, enabling the acquisition of specific cell shapes. In addition, proteins like KATANIN and CLASP reorient dynamically the cortical microtubules. These cortical microtubules rearrangement is in response to mechanical cues, either self-generated (as in b, c) or from neighboring cells (a, c), leading to the resulting cell shape.

Attribution-NonCommercial-NoDerivatives 4.0 International

Auxin controls cell expansion by regulating cell wall biosynthesis and cell remodeling. Auxin promotes cell expansion by acidifying the cell wall and activating wall synthesis and loosening enzymes. Auxin efflux (PINs) and influx (AUX1) transporters establish concentration gradients in growing tissue. Auxin enters cells via influx transporters and activates the TRANSPORT INHIBITOR RESPONSE 1/AUXIN SIGNALING F-BOX PROTEINS-AUXIN/INDOLE ACETIC ACID (TIR1/AFB-Aux/IAA) nuclear signaling cascade, which regulates auxin-responsive genes, including AUXIN RESPONSE FACTORs (ARFs) and SMALL AUXIN UP RNAs (SAURs). Auxin activates the H+-ATPase proton pump through TRANSMEMBRANE KINASE 1 (TMK1), acidifying the cell wall and triggering loosening enzymes including PECTIN METHYLESTERASEs (PMEs), EXPANSINs, and XYLOGLUCAN:XYLOGLUCOSYL TRANSFERASEs (EXTs). Cellulose microfibrils are synthesized by the plasma membrane-bound cellulose synthase complex (CSC), with cortical microtubules guiding the exocytosis of this complex toward expanding cell edges. Auxin coordinates the reorientation of cortical microtubules and actin filaments to regulate the trafficking of cell wall polysaccharides to ensure proper cell wall expansion and specific cell shape acquisition.

Attribution-NonCommercial-NoDerivatives 4.0 International
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Reposted by Steven Zwartkruis
Journal of Experimental Botany @jxbotany.bsky.social · 04/03/2025
DARWIN REVIEW: "Plant cell wall structure and dynamics in plant–pathogen interactions and pathogen defence" - Kristina S Munzert et al, doi.org/10.1093/jxb/... #plantscience 🧪
Infographic demonstrating how multifactorial stress influences cell wall integrity and cell wall-dependent pathogen susceptibility.
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Reposted by Steven Zwartkruis
Tatsuya Nobori @tatsuyanobori.bsky.social · 17/11/2024
The FERONIA–RESPONSIVE TO DESSICATION 26 module regulates vascular immunity to Ralstonia solanacearum academic.oup.com/plcell/advan... #PlantScience
academic.oup.com
The FERONIA–RESPONSIVE TO DESSICATION 26 module regulates vascular immunity to Ralstonia solanacearum
The kinase FERONIA and the transcription factor RD26 drive a signaling cascade that regulates xylem lignin deposition, thereby promoting plant immunity to
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