Alex Martiniere

A schematic showing two models for the evolution of the eukaryotic cell plan starting from an archaeal ancestor. The "inside-out" and "outside-in" models both lead to an intermediate stage with internal and plasma membranes connected by tubules. The sequence continues through the formation of an endomembrane lumen, followed by the emergence of membrane contact sites and tubular carriers, and finally coated vesicles and stable compartments.

I set out to review the evolution of eukaryotic intracellular traffic, but along the way a new hypothesis came into focus: maybe the earliest membrane carriers were tubules, not coated vesicles!

New preprint: ecoevorxiv.org/repository/v...

Here’s the idea. 🧵

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...

Very excited that our work on directional symplastic transport in differentiated root is now published!A developmental switch controls cell-to-cell transport in roots via pectin-linked plasmodesmata changes: Molecular Plant www.cell.com/molecular-pl...

Happy to see Kevin Robe’s work on ZIP transporters published. We found evidences that ZIP2 and ZIP8 are involved in Cu and Fe acquisition respectively and confirmed the role of ZIP3 and ZIP5 in Zn acquisition. journals.plos.org/plosgenetics...

Super interesting work on hydrotropism and gravitropism
www.pnas.org/doi/10.1073/...

Redox-regulated Aux/IAA multimerization modulates auxin responses Reactive oxygen species function as key signals in plant adaptation to environmental stresses like drought. Roots respond to transient water unavailability by temporarily ceasing branching through the...

Out First Release in @science.org today, nice work finding that redox regulates multimerisation of Aux/IAA proteins during root xerobranching:

www.science.org/doi/10.1126/...

Et les plantes colonisèrent la terre ferme… Il y a un demi-milliard d’années, les plantes, encore aquatiques, partaient à la conquête des continents. Une transition qui a métamorphosé la Terre et son atmosphère, ouvrant la voie aux vertébrés te...

Et un peu plus de terrestrialization dans la lettre du @cnrs.fr , toujours avec nos deux compères @chistinesd.bsky.social et @huguesrenault.bsky.social !

lejournal.cnrs.fr/articles/pla...

We are hiring a postdoctoral researcher! Join the Ma Lab in exploring the the intricate interplay between plant development and defense signaling. Link below. #jobs #research #plantbiology #vienna

Delighted to share one piece of my postdoc work in preprint: Through forward genetic screening for suberin deposition in root endodermis, we identified SUBER GENE 1 (SBG1) by GWAS as a novel regulator for suberization by interacting with Type One Protein Phosphatase. www.biorxiv.org/content/10.1...

MTMR regulates KRAS function by controlling plasma membrane levels of phospholipids, say Taylor Lange, Kwang-jin Cho @wrightstateu.bsky.social and colleagues: rupress.org/jcb/article/...

#Cancer #Membrane #lipid #CellSignaling #Biochemistry

Conserved mechanical hallmark guides four-way junction avoidance during plant cytokinesis When building an organ, adjacent cells coordinate to form topologically stable junctions by integrating mechanosensitive signaling pathways. Positioni…

🚨Our paper is out!

If you ever wonder how four-way junctions are avoided during plant cell division, some answers here 🧬🍀🔬🧪🤓

👇
www.sciencedirect.com/science/arti...

🌱 Real-time #stomata imaging just got an upgrade!
Proud to share our latest progress with #PHENOM, now equipped with a custom leaf holder for non-destructive, long-term analysis in natural conditions. 🔬

Works anywhere: field, greenhouse, or growth chamber.

Want to know more? 👉 www.miatecs.com !

Dual and spatially resolved drought responses in the Arabidopsis leaf mesophyll revealed by single‐cell transcriptomics Drought stress imposes severe challenges on agriculture by impacting crop performance. Understanding drought responses in plants at a cellular level is a crucial first step toward engineering improve...

A study led by my good friend from the jolly days at the @ibmp-cnrs.bsky.social (now @psb-vib.bsky.social, UGent), Marieke Dubois

nph.onlinelibrary.wiley.com/doi/full/10....

New Article: "The PP2CH- and PBL27-mediated phosphorylation switch of aluminium ion receptor PSKR1/ALR1 controls plant Al sensing ability" rdcu.be/ehnQE

PP2C phosphatases & PBL27 kinase modulate ALR1–BAK1 complex formation, controlling plant Al sensing & resistance.

An Arabidopsis single-nucleus atlas decodes leaf senescence and nutrient allocation A comprehensive single-nucleus transcriptomic atlas of Arabidopsis across multiple tissues enables the quantification of leaf cell aging state at a single-cell level, highlighting the senescence-relat...

Amazing resource for the Arabidopsis and plant community

www.cell.com/cell/fulltex...

Great discussion! Congratulations again to François!

😍😍

Plasmodesmata: A new frontier for membrane contact site intercellular communication | Plantae Membrane contact sites (MCSs) serve a critical role in intracellular communication, particularly between organelle membranes, enabling direct molecular transfer. Less clear is the role MCSs play in…

Plasmodesmata: A new frontier for membrane contact site intercellular communication plantae.org?p=140096

Two distinct oscillatory auxin signals define the plasticity of lateral rooting in Arabidopsis thaliana The phytohormone auxin defines lateral root pre-branch sites (PBS) in the growing primary root tip. How PBS contribute to the plasticity of the root system architecture remains incompletely understood...

We are excited to update you on two distinct auxin oscillations (local & systemic), revealing how root architecture adapts to fluctuating conditions!

@cibss.bsky.social @biologyunifreiburg.bsky.social @cbgpmadrid.bsky.social

www.biorxiv.org/content/10.1...

GEF14 acts as a specific activator of the plant osmotic signaling pathway by controlling ROP6 nanodomain formation | EMBO reports imageimageRho Of Plant 6 (ROP6) acts as hub for several independent signaling processes and relies on stimuli-dependent membrane nanodomain formation. This study reveals that the GEF isoform GEF14 is ...

Rho of Plant are signalling HUB and GEF behave as signal specific switches. We found that GEF14 specicaly activates ROP6 during osmotic signal. by 2 excellent young researcher L.Gorgues and M.Smokvarska One more great collaboration with
@yvonjaillais.bsky.social

www.embopress.org/doi/full/10....

Hydromechanical field theory of plant morphogenesis The growth of plants is a hydromechanical phenomenon in which cells enlarge by absorbing water, while their walls expand and remodel under turgor-induced tension. In multicellular tissues, where cells...

Great theory paper by @hadrienoliveri.bsky.social & I. Cheddadi: a Hydromechanical field theory of plant growth treating tissue as a growing poroelastic medium. It's a nice bridge from cell biophysics to tissue-scale growth. arxiv.org/abs/2409.02775 & tinyurl.com/22n9ykdo

🌱 When a root cell undergoes symmetric division, are the daughter cells actually identical? By combining live-cell imaging and scRNAseq we discovered a new cell state with uneven BR activity. Read our full paper in Cell: doi.org/10.1016/j.ce... @nvukas.bsky.social @trevormnolan.bsky.social

Genetically encoded biosensors as gateways to retrograde redox signalling in live plants Abstract. In eukaryotic cells, protein supply to organelles varies depending on the stage of development and, in particular, on the exposure to environment

Genetically encoded biosensors as gateways to retrograde redox signalling in live plants academic.oup.com/jxb/article-... @jxbotany.bsky.social

#Communiqué 🗞️ Le CNRS exprime sa solidarité avec les scientifiques exerçant aux États-Unis, où la liberté académique est aujourd'hui mise à l’épreuve.

👉 www.cnrs.fr/fr/presse/le...

Découverte d’un nouveau compartiment cellulaire chez les plantes L’origine et l’évolution des compartiments intracellulaires des cellules eucaryotes, c’est-à-dire celles qui possèdent un noyau, restent une énigme.

Une découverte majeure en biologie végétale ! 🌱 ✨

@yohannboutte.bsky.social et ses collaborateurs ont identifié un nouveau compartiment cellulaire chez les plantes, inconnu jusqu’ici !

Une avancée qui ouvre la voie à de nouvelles recherches sur le développement des plantes ! 🌿

In today's lab journal club, we had a look at this very nice (and complete) story on Pi availability regulating flowering time + a neat mechanism. @hatem-rouached.bsky.social www.biorxiv.org/content/10.1...

Moisture-responsive root-branching pathways identified in diverse maize breeding germplasm Plants grow complex root systems to extract unevenly distributed resources from soils. Spatial differences in soil moisture are perceived by root tips, leading to the patterning of new root branches t...

Proud to share our latest published work on moisture responsive root development-a process we call hydropatterning! We find that this process has been under differential selection during maize breeding and the gaseous hormone ethylene prevents branching in air.
www.science.org/doi/epdf/10....

Transformation of flg22 perception into electrical signals decoded in vasculature leads to sieve tube blockage and pathogen resistance Flg22-triggered dual electric signals are crucial for generation of local and systemic defense responses.

📜 Transformation of flg22 perception into electrical signals decoded in vasculature leads to sieve tube blockage and pathogen resistance

🧑‍🔬 @furch-lab.bsky.social, Aart J. E. van Bel, et al.

📔 Science Advances

🔗 www.science.org/doi/10.1126/...

#️⃣ #PlantScience #PlantImmunity #PlantSignaling

SPS - Summer School 2025 on Advanced Plant Imaging – API : From super-resolution to fluorescence lifetime imaging microscopy 🔬🌱 in Versailles 👑🇨🇵

For enthusiastic PhD students or young postdoctoral researchers !

Only one week left to apply 👇
eng-saclay-plant-sciences.hub.inrae.fr/teaching-and...

ER-to-Golgi trafficking through a dynamic intermediate cis-Golgi tubular network in Arabidopsis - Nature Cell Biology Fougère, Grison et al. show that the ER–Golgi intermediate compartment (ERGIC) in plants is a tubulo-vesicular network marked by MEMBRIN proteins that is largely Golgi-independent. The plant ERGIC mat...

Exited to announce our study on ER-Golgi Intermediate Compartment (ERGIC) in plants!! www.nature.com/articles/s41... Amazing and innovative work from @louisefougere.bsky.social and Magali Grison from @lbm-bordeaux.bsky.social, #SuperResolution, @naturecellbiology.bsky.social