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Center of Excellence in Tree Biology

@treebiocoe.bsky.social

https://www.helsinki.fi/en/researchgroups/centre-of-excellence-in-tree-biology

9 Posts47 Follower12 Folgt
Ari Pekka Mähönen@apmahonen.bsky.social · 9mo ago

By combining molecular genetics with cell-ablation experiments, we found that vascular cambium stem cells and xylem-identity cells form an interchangeable unit, a stem cell niche. Meticulous work by @xixizhang9001.bsky.social, Ondrej Smetana, Jing Zhang & Xiaoyu Wang 1/x www.pnas.org/doi/10.1073/...

Auxin transport positions stem cells in the vascular cambium during normal development and regeneration | PNAS

The vascular cambium contains bifacial stem cells producing secondary phloem in one and secondary xylem to the opposite direction. In Arabidopsis r...

pnas.org

Ari Pekka Mähönen@apmahonen.bsky.social · 9mo ago

We found that cytokinin-induced LBDs drive radial (secondary) growth in Arabidopsis root by reshaping primary cell wall pectin, in part through four pectate-lyase-like genes. Huge congrats to the fantastic postdocs who led this work: Lingling Ye and Xin Wang. 1/x www.nature.com/articles/s41...

Cambium LBDs promote radial growth by regulating PLL-mediated pectin metabolism - Nature Plants

This study reveals that LBD transcription factors in the cambium drive radial plant growth by regulating PECTATE LYASE-LIKE (PLL) enzymes that remodel cell wall pectin, promoting cell expansion.

nature.com

Ari Pekka Mähönen@apmahonen.bsky.social · 9mo ago

Incredible news! I’ve been awarded the Academy Professorship for 2026–2031. I’m deeply grateful to my group members and colleagues for their invaluable contributions that made this possible. @helsinki.fi @treebiocoe.bsky.social www.aka.fi/en/about-the...

Research Council of Finland selects 15 new Academy Professors

The Research Council of Finland (RCF) has decided on funding for 15 new Academy Professorships for the period 1 January 2026–31 December 2031. The revised Academy Professorship funding scheme pr...

aka.fi

Ari Pekka Mähönen@apmahonen.bsky.social · last yr.

How plants sense injury in their barrier tissue, periderm? Painstakingly detailed and amazing work by post doc Hiroyuki Iida shows that wounding is sensed by the diffusion of two gases: ethylene and oxygen. @treebiocoe.bsky.social‬ @erc.europa.eu‬ 1/x 🧵 www.nature.com/articles/s41...

Plants monitor the integrity of their barrier by sensing gas diffusion - Nature

A study using Arabidopsis shows that plants can monitor the integrity of their outer barriers by sensing gas diffusion, enabling them to initiate wound repair to prevent water loss and pathogen entry.

nature.com

Kalle Leppälä@kallelep.bsky.social · last yr.

My new preprint: When R ~ B(n, p) and n/k -> b > 0, then the k:th raw moment of R is asymptotically k^k (Psi +/- epsilon)^k. Earlier only upper and lower bounds of Psi existed, and a recent sharp result when n/k -> infinity. TODO: the case n/k -> 0. arxiv.org/abs/2504.05766

On raw moments of the binomial distribution

We study the $k$:th raw moment of a variable $R$ following the binomial distribution $\text{B}(n, p)$, where $n/k \rightarrow β> 0$. It is known that $\mathbb{E}(R^k)$ is bounded both from below and f...

arxiv.org

Cezary Waszczak@cezarywaszczak.bsky.social · 2y ago

Have you ever wondered how pectin acetylation affects cell adhesion? Together with @breeannau.bsky.social we have the answer! Check our our joint preprint! @treebiocoe.bsky.social www.researchsquare.com/article/rs-5...

TBR is an RG-I rhamnose O-acetyltransferase required for epidermal cell adhesion in Arabidopsis thaliana

Pectins are enriched in primary cell walls and the middle lamella, determining cell-to-cell adhesion. O-acetylation of pectin backbones influences their physicochemical properties and plays a role in ...

researchsquare.com