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Hanna Hõrak

@hanna-horak

Associate Professor in the University of Tartu, interested in stomatal development and physiology

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23.12.2023
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Latest posts by Hanna Hõrak @hanna-horak

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🚨 PhD Position in Plant Molecular Biology 🌱
We are looking for a motivated PhD student to join our team to study root protective barriers. If you are interested in confocal microscopy, cell wall biology, and plant development, this project might be for you! Please share!
#PlantScience #PlantSciJob

09.03.2026 21:37 👍 25 🔁 28 💬 0 📌 0
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Impressive work from @saschalaubinger.bsky.social and colleagues, describing molecular and phenotypic footprints of climate in transcriptomes of native Arabidopsis thaliana.
#plantscience
www.biorxiv.org/content/10.6...

08.03.2026 08:07 👍 49 🔁 11 💬 2 📌 0
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🍃 Invited Speakers 🍃 photosynthesis2026.com

Photosynthesis in the oceans, Aquatic photosynthesis
🌿Thomas Ryan-Keogh, National Oceanography Centre
🌿Rich Puxty, University of Warwick

@noc.ac.uk @warwicklifesci.bsky.social
#ICPR26 #photosynthesis

25.02.2026 13:58 👍 0 🔁 1 💬 0 📌 0
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🍃 Invited Speakers 🍃 photosynthesis2026.com

Plant and ecosystem photosynthesis in a warming world
🌿Martijn Slot, Smithsonian Tropical Research Inst.
🌿Elizabete Carmo-Silva, Lancaster University

@martijnslot.bsky.social @ecarmosilva.bsky.social @lancasterplantbio.bsky.social
#ICPR26 #photosynthesis

25.02.2026 13:58 👍 2 🔁 4 💬 1 📌 0
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🍃 Invited Speakers 🍃 photosynthesis2026.com

Artificial photosynthesis and biohybrid systems
🌿Iftach Yacoby, Tel Aviv University
🌿Gustav Berggren, Uppsala University

#ICPR26 #photosynthesis

25.02.2026 13:58 👍 0 🔁 1 💬 1 📌 0
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🍃 Invited Speakers 🍃 photosynthesis2026.com

Rubisco 2.0
🌿Laura Gunn, Cornell University
🌿Jeroni Galmés, University of the Balearic Islands

@laura-gunn.bsky.social @uib.cat
#ICPR26 #photosynthesis

25.02.2026 13:58 👍 0 🔁 1 💬 1 📌 0
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🍃 Invited Speakers 🍃 photosynthesis2026.com

C4 and CAM for photosynthetic improvement
🌿Jane Langdale, University of Oxford
🌿Ariel Orellana López, Universidad Andrés Bello

@janelangdale.bsky.social @biology.ox.ac.uk
#ICPR26 #photosynthesis

25.02.2026 13:58 👍 1 🔁 2 💬 1 📌 0
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🍃🎤🍃 Speaker announcement 🍃🎤🍃

Continuing on from last week, we're happy to announce the next set of Invited Speakers across our Photosynthesis 2026 concurrent sessions!

🌿 Share the stage in Liverpool this July 🌿
Submit your abstract by 31st March 👉 photosynthesis2026.com

#plantscience #ICPR26
🧵1/7

25.02.2026 13:58 👍 6 🔁 3 💬 1 📌 1
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🍃 Invited Speakers 🍃 photosynthesis2026.com

Stomata, the gatekeepers of photosynthesis
🌿Hanna Hõrak, University of Tartu
🌿Silvère Vialet-Chabrand, Wageningen University

@hanna-horak.bsky.social @silverevialet.bsky.social @w-u-r.bsky.social
#ICPR26 #photosynthesis

25.02.2026 13:58 👍 1 🔁 1 💬 1 📌 0
Fig. 1 Different light responses of adaxial and abaxial stomata in a dicot leaf.

Fig. 1 Different light responses of adaxial and abaxial stomata in a dicot leaf.

Functional and developmental differences between adaxial and abaxial #stomata in amphistomatous #leaves

A #ResearchReview by @hanna-horak.bsky.social
👇

📖 nph.onlinelibrary.wiley.com/doi/10.1111/...

#LatestIssue

22.01.2026 18:04 👍 9 🔁 4 💬 0 📌 0
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Save the date: Plant Development PhD school (i.e. Retzbach 2.0) in Neustadt, Germany.

Sept 23rd-25th, 2026
~€350 all inclusive

Excellent speakers and a relaxed atmosphere for early-career researchers (PhDs & postdocs). Registration opens soon.

For more info, see
raissiglab.org/plantdevosch...

13.01.2026 12:50 👍 31 🔁 40 💬 2 📌 1
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📣 We are seeking a postdoctoral research fellow in ancient metagenomics. Join us at the Institute of Genomics, University of Tartu.

⏳ 01.04.2026–31.03.2028
📚 1.0 position
📍 Riia 23b, Tartu, Estonia

ℹ️ Project: lnkd.in/dQARuBxM
ℹ️ Application: lnkd.in/dFR8DQxH

⏰ Deadline 02.02.2026

14.01.2026 14:39 👍 10 🔁 19 💬 1 📌 0

🔥ADVANCE ACCESS🔥: Carbon dioxide or photosynthetically active radiation? Evaluation of the significance of individual environmental factors that control leaf stomatal development
doi.org/10.1093/aob/...

#PlantScience

10.01.2026 12:04 👍 2 🔁 1 💬 0 📌 0
A gel electrophoresis picture.
It shows DNA of different sizes.

A gel electrophoresis picture. It shows DNA of different sizes.

Happy New Year!
May all your PCRs give you only specific bands of the appropriate sizes. May your gel extraction and miniprep yields be high.
May your cloning always give you at least one correct colony, and your genotyping identify the mutants you are after. ✨

01.01.2026 10:15 👍 53 🔁 8 💬 0 📌 1
Photo of Anna Kampová,

Photo of Anna Kampová,

Profile of Anna Kampová

nph.onlinelibrary.wiley.com/doi/10.1111/...

17.12.2025 20:43 👍 5 🔁 2 💬 0 📌 0
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ERC grant helps to understand why the upper and lower surfaces of plant leaves differ Hanna Hõrak, Associate Professor of Molecular Plant Physiology at the University of Tartu Institute of Technology, has received a prestigious European Research Council (ERC) grant to study how cell pa...

Thankful, happy and excited to be awarded an ERC consolidator grant to understand how and why some plants make stomata on their upper leaf surface. tuit.ut.ee/en/news/erc-... #ERCCoG @erc.europa.eu

09.12.2025 16:02 👍 49 🔁 10 💬 4 📌 1
Different light responses of adaxial and abaxial stomata in a dicot leaf.

Different light responses of adaxial and abaxial stomata in a dicot leaf.

Stomatal development and function in the upper and lower leaf surfaces

Hõrak @hanna-horak.bsky.social

nph.onlinelibrary.wiley.com/doi/10.1111/...

25.11.2025 05:19 👍 10 🔁 7 💬 0 📌 0
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1/ Preprint alert:

🌾 The developing leaf of the wild grass Brachypodium distachyon at single-cell resolution

👉 doi.org/10.1101/2025...
A 70k-cell single-cell RNA-seq atlas of the developing grass leaf—from the shoot meristem to mature leaf tissues. @cerealcell.bsky.social @lbmountain.bsky.social

05.11.2025 12:32 👍 49 🔁 31 💬 3 📌 3
Preview
Spinger Nature Discovers MDPI – The Strain on Scientific Publishing Home page for the paper ‘The Strain on Scientific Publishing’ by Mark A Hanson, Dan Brockington, Paolo Crosetto and Pablo Gomez Barreiro

New from The Strain Team:
🎊 Springer Nature Discovers MDPI 🎊

Springer Nature has spawned a copycat journal series called "Discover" mimicking #MDPI journal titles and citation behaviours. We even made a browser game to prove it (see 🔗).

Gross! 😀 1/n

#ResearchIntegrity #SciPub #AcademicSky

10.06.2025 05:47 👍 240 🔁 180 💬 12 📌 32
Image Text: The Plant Cell. Call for Assistant Features Editors. Deadline for applications: September 15, 2025. Featuring The Plant Cell logo.

Image Text: The Plant Cell. Call for Assistant Features Editors. Deadline for applications: September 15, 2025. Featuring The Plant Cell logo.

📣The Plant Cell is recruiting Assistant Features Editors. The application period opens now and runs through September 15, 2025!🌱

👉Application information can be found at this link: blog.aspb.org/the-plant-ce...

#plantscience

02.06.2025 14:15 👍 27 🔁 21 💬 0 📌 42
A PhD position (initially 3 years) is available in our laboratory in the Center for Plant Molecular Biology (ZMBP), at the University of Tübingen (Germany). The position is available with an intended start date starting January 2026.
Interested applicants should submit a single PDF comprising a motivation letter describing your research interests, an up-to-date CV, and the names and contact information for 2 references to timing.lab@zmbp.uni-tuebingen.de ideally before July 21st.

A PhD position (initially 3 years) is available in our laboratory in the Center for Plant Molecular Biology (ZMBP), at the University of Tübingen (Germany). The position is available with an intended start date starting January 2026. Interested applicants should submit a single PDF comprising a motivation letter describing your research interests, an up-to-date CV, and the names and contact information for 2 references to timing.lab@zmbp.uni-tuebingen.de ideally before July 21st.

We're looking for a new PhD candidate to join the lab. Please share 🌱😄

05.06.2025 05:37 👍 83 🔁 125 💬 3 📌 5
A grey coloured Arabidopsis leaf epidermis, with black cell walls. Each cells has a colourful blobs - a nuclear localised fluorescent ABA sensor, with warm colours indicating high concentrations, and cooler colours indicating lower concentrations.

A grey coloured Arabidopsis leaf epidermis, with black cell walls. Each cells has a colourful blobs - a nuclear localised fluorescent ABA sensor, with warm colours indicating high concentrations, and cooler colours indicating lower concentrations.

The Rowe lab is recruiting a #PlantScience PhD student for 2025! You'll use our new ABACUS FRET biosensors to map the leaf #AbscisicAcid accumulations at low humidity in Arabidopsis, wheat and rice to understand how ABA regulates stomatal dynamics. #PhDposition

www.findaphd.com/phds/project...

14.03.2025 14:08 👍 30 🔁 37 💬 1 📌 2

Excited to share our latest research on stomatal dynamics! We developed a microscope to image individual stomata. Maize stomata respond faster to light changes, optimizing CO₂ uptake, while chrysanthemum shows slower closure, affecting water use. onlinelibrary.wiley.com/doi/epdf/10.... #Stomata

10.03.2025 20:40 👍 4 🔁 2 💬 0 📌 0
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TODAY is DEADLINE DAY for abstract submissions for talks and posters at SEB 2025! @casparchater.bsky.social and I have a great lineup of Keynote speakers in our #stomata session including SEB president @proftlawson.bsky.social. Please spread the word!

07.03.2025 06:20 👍 3 🔁 5 💬 0 📌 0
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If you want to present your latest #stomata research at SEB 2025, there are only 4 days until the submission deadline(7th of March)!! Excitingly, @casparchater.bsky.social and I can now also announce a brand new Workshop focused on measuring gas exchange across scales with @li-corenv.bsky.social👇👇

04.03.2025 12:06 👍 8 🔁 8 💬 0 📌 1

Great work showing the multifaceted role of FAMA regulating differentiation in stomatal and myrosin cells.

Also check out my News & Views piece 📝 As a stomatal enthusiast I was especially intrigued by the potential separation of division and differentiation phenotypes 🌱🤔

25.02.2025 10:36 👍 16 🔁 6 💬 1 📌 0
Photo of Dominique Bergmann

Photo of Dominique Bergmann

In this interview, Dominique Bergmann @stanfordstomata.bsky.social talks about her research in stomatal development, her role as an Editor at Development, and how her passion for comparative biology has influenced her career:
https://doi.org/10.1242/dev.204667

24.02.2025 09:51 👍 35 🔁 23 💬 0 📌 0
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Only 2 weeks to go until the deadline for talk and poster abstracts for SEB 2025. @casparchater.bsky.social and I are really looking forward to hosting keynotes @proftlawson.bsky.social, Dr John Ferguson and Dr Lorna McAusland for a session on #stomata and #crops. @sebiology.bsky.social Please RT!!

21.02.2025 16:30 👍 8 🔁 6 💬 0 📌 1

Our @dfgpublic.bsky.social Research Unit "Cereal Stem Cell Systems" is now on Bluesky!
Follow us if you are interested in grasses, stem cells and developmental biology. @simonrdg.bsky.social @schnittger-lab.bsky.social @hochholdingerf.bsky.social @yvonnestahl.bsky.social @cecilialaram.bsky.social

14.01.2025 09:38 👍 25 🔁 10 💬 1 📌 0

Happy to share our preprint on negative relationship between adaxial stomatal density and yield in wheat under field conditions, especially under water and nutrient limitation.

09.01.2025 10:15 👍 5 🔁 1 💬 0 📌 0