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Ari Pekka Mähönen

@apmahonen.bsky.social
1.5K followers 483 following 252 posts

Plant Developmental Biologist, Academy Professor at University of Helsinki. Funded by #ERCAdv, Novo Nordisk Fonden, CASS3 & #Treebio CoE Website: t.co/oFteNQ3WuH

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Reposted by Ari Pekka Mähönen
Maria E. Eriksson @treesandgrowth.bsky.social · 30/09/2026
Nice work from my colleagues! 🪵🌳#Plantsci Nitrate transiently rewires transcription in developing xylem of Populus wood to promote cell expansion via CRF4 academic.oup.com/plcell/artic...
academic.oup.com
Nitrate transiently rewires transcription in developing xylem of Populus wood to promote cell expansion via CRF4
Abstract. Nitrate functions both as a nutrient and a signaling molecule, but how nitrate is perceived and translated into developmental outputs within wood
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Sainsbury Laboratory Cambridge University (SLCU) @slcuplants.bsky.social · 29/09/2026
A huge thank you to everyone who attended #SLS26 & our concluding keynote speaker @apmahonen.bsky.social for a fascinating talk and exciting new insights into how stem cell fate decisions are regulated in the vascular cambium. Read more about his team's work: www.helsinki.fi/en/researchg...
Group photo of attendees at #SLS26Ari Pekka Mähönen presenting at #SLS26
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Noel Blanco-Touriñán @noelponte.bsky.social · 24/09/2026
🧵 1/8 Have you ever wondered how information embedded within exons regulates gene expression in plants? 🌱🧬 Check out our latest work, where we explore how exonic enhancers (EEs) shape gene expression in plants! www.biorxiv.org/content/10.6...
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Ulrich Hammes @uhammes.bsky.social · 24/09/2026
We’re looking for a new colleague in Würzburg! 🌱 W3 Professorship in Plant Metabolism 💊 Chair of Pharmaceutical Biology 🧪 Head of the Metabolomics Core Unit jobs.zeit.de/jobs/univers... Please spread the word! Questions? Feel free to contact me. www.biologie.uni-wuerzburg.de/en/about-the...
biologie.uni-wuerzburg.de
W3_Pflanzenmetabolismus - FACULTY OF BIOLOGY
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Prof. Keiko Torii @keikoutorii.bsky.social · 24/09/2026
I am proud to share my No-AI-assisted perspective review "Plant Peptide Hormones: Three Decades of Discovery and Emerging Paradigms" for the Centennial issue of @plantphys.bsky.social 🌱🍅. It's OA, so everyone can access! 1/ academic.oup.com/plphys/advan...
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Sainsbury Laboratory Cambridge University (SLCU) @slcuplants.bsky.social · 22/09/2026
And if this looks like fun research that you would like to be involved in, @mc-caillaud.bsky.social has 2 postdoc positions. Applications close: 1 November 2026
Promotional slide with images from plant science research in Marie-Cécile Caillaud's research team. Two postdoc positions in Marie-Cécile Caillaud's research team at 
RDP - ENS Lyon. Applications close 1 November 2026. Starting date Jan 2027 onwards.
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Tonni Andersen @tonnigrubeandersen.bsky.social · 22/09/2026
Check out our new preprint: a very cool fluorescence tool developed by @samwalds.bsky.social www.biorxiv.org/content/10.6...
biorxiv.org
Intronised fluorophores improve reporter output and biosensor expression in plants
Genetically encoded biosensors are central to plant cell biology, but low reporter signal can limit their use. Here, we developed modular intronised fluorophores to improve reporter output in transien...
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Daan Weits @daanweits.bsky.social · 31/08/2026
Oxygen levels in leaves is a hot topic in @isplore.bsky.social and I'm very curious to find out how this all fits together! @djgibbs.bsky.social @drosborneplantsci.bsky.social @theplantlab.bsky.social @paolotriozzi.bsky.social pubmed.ncbi.nlm.nih.gov/40147448/ pubmed.ncbi.nlm.nih.gov/38243593/
sciencedirect.com
VRN2-PRC2 facilitates light-triggered repression of PIF signaling to coordinate growth in Arabidopsis
VERNALIZATION2 (VRN2) is a flowering plant-specific subunit of the polycomb-repressive complex 2 (PRC2), a conserved eukaryotic holoenzyme that repres…
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Michael Raissig @michaelraissig.bsky.social · 07/08/2026
🌾 We're hiring a postdoc! Join the Stomatal Biology group in beautiful Bern @unibe.ch How do grass leaves spatially coordinate development of veins & stomatal rows? 2 years (plus possible extension), funded by @snsf.ch @dfg.de within @cerealcell.bsky.social RU5325 jobs.unibe.ch/job-vacancie...
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Scandinavian Plant Physiology Society (SPPS) @plantspps.bsky.social · 21/08/2026
🌱 That's a wrap. #SPPS2026 has closed after three days of plant science in Helsinki. The whole crowd, one last time. 👇 📷 Ari Pekka Mähönen 🧵 1/9
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Plant Cell Atlas @plantcellatlas.bsky.social · 20/08/2026
We are so excited to announce that applications are now being accepted for the 2027 Single-Cell Approaches in Plant Biology Gordon Research Conference! Learn More and Apply Now! www.grc.org/single-cell-...
Image of a Gordon Research Conference webpage for “Decoding Plant Cell Biology Through Integrated Single Cell ‘Omics,” taking place August 8–13, 2027, at the University of Southern Maine in Portland, Maine. The page lists Nicola Patron and Marc Libault as chairs and Tatsuya Nobori and Shao-Shan Carol C. Huang as vice chairs. On the left is a collage of colorful microscopic images of plant cells.
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Scandinavian Plant Physiology Society (SPPS) @plantspps.bsky.social · 18/08/2026
🌱 Day 1 of #SPPS2026 in Helsinki. Our society is meeting at the University of Helsinki this week, and the first day set a high bar. Ari Pekka Mähönen opened the meeting and chaired the first session, impressively relaxed one minute in 😌👇 📷 Mats Hansson 🧵 1/7
Ari Pekka Mähönen opening the conference — "One minute in, and the host and session chair already looks relaxed." (📷 Mats Hanson)
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GeminiTeamLab @geminiteamlab.bsky.social · 18/08/2026
So excited and incredibly grateful for this opportunity! 🦠🌱🧬
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Anja Geitmann @geitmannlab.bsky.social · 17/08/2026
Postdoc Opportunity at McGill University, Montreal, Canada You have worked with Arabidopsis / other plant model systems & are trained in high-end imaging? Details: www.plantbiomechanics.net/joining-the-... #plants, #Arabidopsis, #postdoc, #jobs, #microscopy, #confocal, #molecularbiology
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Dominique Bergmann @stanfordstomata.bsky.social · 13/08/2026
Super cool exploration of stomatal bHLH gene evolution in ferns and gymnosperms. A decade ago Anne Vatén @stomagenesis.bsky.social already knew these plants were critical missing links -- now her group has functional studies in spruce! www.biorxiv.org/content/10.1...
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Paula Elomaa @paulaelomaa.bsky.social · 12/08/2026
Getting ready for the Conference of the Scandinavian Plant Physiology Society @plantspps.bsky.social next week @helsinki.fi - exciting event ahead!
  Conference coordinator with student assistants preparing name badges for the participants
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The Plant Cell @theplantcell.bsky.social · 10/08/2026
IN BRIEF: What if… cytokinin meets auxin in developing roots? The story behind root ring formation (Luciano M Di Fino) doi.org/10.1093/plce... #PlantScience @aspbofficial
doi.org
What if… cytokinin meets auxin in developing roots? The story behind root ring formation
Auxin–cytokinin antagonism is a core regulatory principle in plant development. In the root apical meristem, auxin maxima and gradients contribute to patte
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PlantEvolution 🌱🌾 @plantevolution.bsky.social · 09/08/2026
A major advice I try to pass on: science is only worth it if you can delight in the discoveries of others. It’s great to make your own discoveries but they are too few to sustain you over the long haul.
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Ursula von der Leyen @vonderleyen.ec.europa.eu · 07/08/2026
Europe always chooses science and partnership. Japan too. Japan is now officially associated with Horizon Europe. This means Japanese researchers and organisations can take part in the world's largest public research and innovation programme. Let's break new frontiers together.
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Teva Vernoux @tevavernoux.bsky.social · 30/07/2026
Together with @plantophagy.bsky.social, we have an opened postdoc position for a young scientist that graduated after 01/01/2025, see ad attached
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Bert De Rybel @bertderybel.bsky.social · 30/07/2026
Happy to share our combined views on the opportunities and challenges in single-cell and spatial biology; collaborative work now out in @theplantcell.bsky.social : track.smtpsendmail.com/9032119/c?p=...
track.smtpsendmail.com
Decoding plants cell by cell: opportunities and challenges in single-cell and spatial biology
Single-cell and spatial biology techniques present new opportunities for plant research, but also come with methodological considerations, technical limita
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Yasin Dagdas @plantophagy.bsky.social · 29/07/2026
@oeaw.bsky.social is searching for the next #director of @gmivienna.bsky.social ‼️It’s a huge opportunity to shape the future of #plantscience oeawnr.onlyfy.jobs/de/job/u3g5t...
oeawnr.onlyfy.jobs
Scientific Director (f/m/x)
OeAW - Discovering the futureThe Gregor Mendel Institute of Molecular Plant Biology (GMI), part of the Austrian Academy of Sciences (OeAW), is seeking to appoint a visionary Scientific Director to lea
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Rebecca Mosher @rm0sher.bsky.social · 24/07/2026
Does anyone have a 3xFlag tag in the pGreengate system and would be willing to share a bit? 🙏 Please RT to claim your virtual belly rub opportunity:
A brown and white tabby can curled up on his back to show his very soft tummy
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Dolf Weijers @dolfweijers.bsky.social · 23/07/2026
Online at @cellcellpress.bsky.social today: everything you always wanted (???) to know about Auxin Signaling and never dared to ask. From Jiashu, Aaron and Martijn in our team, with @luciastrader.bsky.social and Tongda Xu www.sciencedirect.com/science/arti...
sciencedirect.com
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Thomas Greb @thomasgreb.bsky.social · 20/07/2026
In an heoric endeavor, Xiomin Liu, PhD student in the lab, characterized the dynamics and topology of the cell division machinery during cambium stem cell divisions. Super fruitful collaboration with the group of Sabine Müller (@phragmoplast.bsky.social). doi.org/10.1111/nph....
doi.org
The preprophase band is dispensable for robust cell division orientation in wood‐forming cambium stem cells
Characterization of periclinal and anticlinal cell divisions in dividing cambium stem cells (CSCs). (a) Scheme indicating periclinal and anticlinal cell divisions in CSCs in the Arabidopsis hypocotyl...
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Ari Pekka Mähönen @apmahonen.bsky.social · 08/07/2026
Strongly recommended read for plant stem cell enthusiasts!
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Michelle Facette @mfacette.bsky.social · 29/10/2025
Come work with us!! We have a great group of plant biologists already, and there are FOUR searches for new plant biologists of different flavours across campus. We also have an outstanding group of animal physiologists (including @mstager.bsky.social ). Please apply!!
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Tonni Andersen @tonnigrubeandersen.bsky.social · 07/07/2026
Time for another preprint from the lab: www.biorxiv.org/content/10.6... Led by @yuanyuanzhang.bsky.social and @defengshen.bsky.social. We found some surprising secrets that connect and uncouple root barrier formation with systemic nitrogen signaling in shoots. see the thread below for more details
biorxiv.org
A tunable receptor separates root barrier formation from nutrient signaling through ligand-perception states
In roots, the endodermis controls nutrient entry by forming a barrier known as the Casparian strip. Yet how barrier-associated processes interface with systemic signaling remains unclear. Here, we sho...
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Nick Talbot @talbotlabtsl.bsky.social · 06/07/2026
PhD position in my group for entry in October 2026. Round 3 of the @nrpdtp.bsky.social BBSRC competition. Please RT👇 biodtp.norwichresearchpark.ac.uk/projects/van...
biodtp.norwichresearchpark.ac.uk
Vanishing Virulence: Investigating pathogenicity loss in a plant pathogenic fungus (TALBOT_S26DTP3) | Doctoral Training Partnership
What makes a plant killer lose its edge? This project will investigate why fungal pathogens lose virulence when they are grown in laboratory culture away from their host plant. Use cutting-edge…
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Claudia Köhler @claudiakohler11.bsky.social · 01/07/2026
Our lab @mpi-mp-potsdam.bsky.social is hiring two postdoctoral researchers to join our ERC-funded GRAFT project on mobile small RNAs in plants. 🔗 Details: jobs.mpimp-golm.mpg.de/jobposting/b... 📅 Deadline: July 31, 2026 Please share!
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bioRxiv Plant Bio @biorxiv-plants.bsky.social · 30/06/2026
CLAVATA3 peptide signaling from stem cells integrates vascular organization and stem cell maintenance in Arabidopsis shoots www.biorxiv.org/content/10.64898/20…
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EMBO @embo.org · 30/06/2026
Welcome and congratulations to the 60 new members and 11 associate members who have been elected to the EMBO Membership! They join a community of more than 2,200 leading scientists. 🧪 www.embo.org/press-releases/seventy… #EMBOMembers2026
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Journal of Experimental Botany @jxbotany.bsky.social · 29/06/2026
🕸️ DARWIN REVIEW 🕸️ Robil & Scarpella show that vein patterns are more diverse than commonly thought, and identification of vein precursor cells is arbitrary and inconsistent across species, thus challenging current understanding of vein patterns 🌿 🔗 doi.org/10.1093/jxb/... #PlantScience 🧪
Fig. 5 (shortened, full legend in paper): Leaf and vein pattern evolution. (A–C) The body of the earliest known vascular plants was a series of leafless axes that repeatedly branched into two axes of equal size oriented in three dimensions. (D–G) Megaphylls may have evolved from axes that repeatedly branched into two axes of equal size oriented in three dimensions (D) by unequal branching that gave rise to a single dominant axis and several non-dominant axes (E), followed by branching of the non-dominant axes in two, as opposed to three, dimensions (F), and eventually by formation of tissue that filled the space between those non-dominant axes (G). (H, I) Microphylls may have evolved from either axis reduction (H) or vascularization of axis outgrowths (I). (J–M) The first megaphylls may have been leaves with very limited tissue growth near the base of single-vein branches (J).
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allie10.bsky.social @allie10.bsky.social · 28/06/2026
Climate.us 💥🌪️☀️❄️🌬️💦💧🌊🍀
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Ran Blekhman @blekhman.bsky.social · 27/06/2026
I wanted to like QED's new 1% preprint ranking. I really did. But the more I looked at the data, the more uncomfortable it made me. Here is my full peer review. open.substack.com/pub/blekhman...
open.substack.com
My Peer Review of The 1%
I wanted to like QED's new 1% ranking. I don't.
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Marc Somssich @somssich.bsky.social · 03/01/2024
#PlantScienceClassics #6: The T-DNA. In a 1977 paper, Mary-Dell Chilton & colleagues identify the Transferred DNA (T-DNA), the bit of DNA that Agrobacterium tumefaciens inserts into the plant genome, to kick off the race toward the first transgenic plant. doi.org/10.1016/0092...
A portrait of Mary-Dell Chilton, and the title page of her 1977 Cell paper "Stable incorporation of plasmid DNA into higher plant cells: the molecular basis of crown gall tumorigenesis".
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Ari Pekka Mähönen @apmahonen.bsky.social · 24/06/2026
Exciting paper by Laura and Sandy on phloem evolution. Those Rhynie chert fossils rock (also, very literally)! www.sciencedirect.com/science/arti...
sciencedirect.com
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Ari Pekka Mähönen @apmahonen.bsky.social · 23/06/2026
I am incredibly excited and grateful to have received an ERC Advanced Grant for my project, WOODIER: What Makes Trees Woody! 🌳 This award feels like the culmination of many years of work carried out in our research group, and the biggest thanks go to my lab members. bsky.app/profile/erc.... 1/x
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Tanja Pyhäjärvi @pyhatanja.bsky.social · 23/06/2026
We are looking for a PhD researcher to work for the “ClimatePine” -project, conducted in collaboration among Natural Resources Institute Finland, Metsähallitus Forestry Ltd and University of Helsinki. More info: valtiolle.fi/en/jobs/rese...
valtiolle.fi
Research Scientist, doctoral researcher, forest breeding - Natural Resources Institute Finland
Open job: Research Scientist, doctoral researcher, forest breeding, Natural Resources Institute Finland - Find all jobs in Valtiolle.fi
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Ari Pekka Mähönen @apmahonen.bsky.social · 22/06/2026
Fantastic work from the Etchells lab! And a great 🧵 too!
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Sebastián Moreno-Ramírez @sebamorenor.bsky.social · 22/06/2026
Excited to share that our work on single-nucleus RNA-seq of the shoot apical meristem — the shoot stem cell niche — has found a home. #Plantascience #scRNAseq #stemcells www.science.org/doi/10.1126/...
science.org
Single-nucleus transcriptomics resolves multiple fate dynamics between inflorescence meristem and primary stem
snRNA-seq reveals shoot stem cell heterogeneity and traces their differentiation into primary stem cell types.
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Sainsbury Laboratory Cambridge University (SLCU) @slcuplants.bsky.social · 19/06/2026
New insights into cell fates of the Arabidopsis inflorescence meristem @sebamorenor.bsky.social generated the most detailed map to date of this critical stem cell niche, identifying 18 distinct cell type clusters, including precursors to cortex & vascular tissues www.slcu.cam.ac.uk/news/new-ins...
Inflorescence meristem cell identities: (A) Force-directed graph layout of clusters associated with inner cell layers such as early primordia (EP), undifferentiated cells, procambium, xylem parenchyma and cortex. Clusters are represented by different colours. (B) Schematic illustration of selected cell identities in the primary stem and inflorescence meristem. Procambial strands arise in developing primordia and give rise to vascular bundles, which subsequently differentiate into phloem, cambium and xylem within the primary stem. The exact locations of cell identities in the primary stem are schematically represented rather than accurately portrayed. Illustration by first author first author Dr Sebastián Moreno-Ramírez. Source: Fig 6 in Moreno-Ramirez et al Science Advances 2026.
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New Phytologist @newphyt.bsky.social · 17/06/2026
Profile of Ikram Blilou nph.onlinelibrary.wiley.com/doi/10.1111/...
Photo of Ikram Blilou
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Joachim Goedhart @joachimgoedhart.bsky.social · 12/06/2026
Fluorescence Lifetime Imaging in Plants: Practical guidelines for multiplexing, label-free imaging and data analysis by Thomas Ott and team: www.biorxiv.org/content/10.6...
Figure 2. Live-cell multicolour lifetime imaging with two pairs of fluorescent reporters in different spectral windows. A) Two green- (EGFP and NowGFP) and two red- (mCherry and mScarlet) emitting FPs with large lifetime differences (Δτ) were targeted to four different compartments of N. benthamiana leaf epidermal cells (schematic). PM = plasma membrane; Chl = chloroplasts; N = nucleus; ER = endoplasmic reticulum. B) Intensity-only and FastFLIM confocal images of an epidermal cell showing the discrimination of two fluorescent reporters within the green and red channel based on lifetime values (rainbow bar). C) Identification of the fluorescent reporters and mapping of their subcellular distribution based on the Phasor fingerprint. The white dashed box indicates the region shown in the close up in (D)
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German Society for Plant Sciences (DBG) @plantsciencedbg.bsky.social · 11/06/2026
#PlantSciJobs #PlantSciJob #PlantScience W3 Professorship: Plant Biotechnology 📍 @uni-freiburg.de succeeding Prof. @reskilab.bsky.social Start: 1 April 2027 Application deadline: 10 July 2026 www.deutsche-botanische-gesellschaft.de/en/job-openi...
deutsche-botanische-gesellschaft.de
Job Openings
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Ghent Rooting-lab/Steffen Vanneste @stvanneste.bsky.social · 11/06/2026
#single insert transformation. The problem of multiple inserts lies in your T-DNA 😳 www.biorxiv.org/content/10.6...
biorxiv.org
Rational design of T-DNA vectors enables predictable, single-copy integration in Arabidopsis thaliana
Agrobacterium-mediated transformation is the dominant method for plant transgenesis, yet it frequently produces multi-copy, structurally complex T-DNA insertions associated with transgene silencing, u...
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Laurie Belcher @lauriebelch.bsky.social · 09/06/2026
The new OrthoFinder paper is out now! In this new work, we introduce major advances in accuracy and scalability, allowing analysis on much larger datasets www.nature.com/articles/s41... github.com/OrthoFinder/...
nature.com
OrthoFinder: improved phylogenetic orthology inference with enhanced accuracy and scalability - Nature Methods
The updated OrthoFinder v3 software boosts accuracy and scalability in phylogenetic orthology inference with massive and diverse datasets.
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Ari Pekka Mähönen @apmahonen.bsky.social · 02/06/2026
Funded, four-year Doctoral Researchers positions open in various disciplines at the University of Helsinki, including my laboratory! jobs.helsinki.fi/job/Helsinki...
jobs.helsinki.fi
Doctoral Researchers (30 positions) in various disciplines at the University of Helsinki, Finland
Doctoral Researchers (30 positions) in various disciplines at the University of Helsinki, Finland
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Dominique Bergmann @stanfordstomata.bsky.social · 02/06/2026
This is going to be so exciting! Reach out with ideas! And come find me at ICAR in Singapore to learn more.
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