@xixizhang9001.bsky.social
Plant science, vascular cambium, stem cell, cell biology, postdoc
Qing took on a project with a biochemistry core in a genetics lab. She was incredibly resilient and crucially, we had wonderful collaborators @xixizhang9001.bsky.social @apmahonen.bsky.social @villepaavilainen.bsky.social Ehmke, Ray, Wenbin, Prodeep, Tuomas, Hanan, Yuan. Congratulations all!
Mighty Morphin Power Rangers Posing
ALT: Mighty Morphin Power Rangers Posing
static.klipy.com
Really pleased to see Qing He’s work out in its final form (www.pnas.org/doi/epdf/10....). My group had previously shown that PXY-mediated regulation of cambium development had an ERECTA-mediated influence, but we didn’t understand the mechanism. 🧵
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
pnas.org
Out in @science.org this week: PME5 is sequestered in the nucleus and released during cytokinesis allowing its activity to be timed with cell division. www.science.org/doi/10.1126/... #PlantScience #PlantSci
Cell wall patterning regulates plant stem cell dynamics
The plant cell wall regulates development through spatiotemporal modulation of its chemical and mechanical properties. Pectin methylesterification is recognized as a rheological switch controlling wal...
science.org
The genetics of paradoxes: CLE peptide signaling in the Arabidopsis root tip #plantscience
The genetics of paradoxes: CLE peptide signaling in the Arabidopsis root tip
Signaling of secreted CLAVATA3/EMBRYO SURROUNDING REGION (CLE) peptides via CLV1-type receptor kinases is a central mechanism regulating stem cell pool size. Originally characterized in the context of shoot meristem maintenance, this network has been increasingly scrutinized in recent years for its role in Arabidopsis thaliana (Arabidopsis) root meristem maintenance and organization. These analyses revealed unique, often seemingly paradoxical facets, which can be understood from the rewiring of CLE signaling networks in the root compared with the shoot. Here, we review the intricate interplay between distinct and antagonistic CLE signaling pathways in the primary root meristem, which suggests that the core function of CLE signaling in roots is to dynamically buffer antagonism between positive and negative signaling inputs, thereby enhancing developmental robustness.
dlvr.it
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
Very excited to share that another project from my postdoc has been published in PNAS! It’s been quite a journey, and I finally feel like I’ve fully transitioned from cell biology into the world of plant developmental biology.
Ari Pekka Mähönen@apmahonen.bsky.social · 10mo agoBy 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/...
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
⏰Happening next Friday, November 21, 2025, at 2:30 pm Eastern time. Join us!🌱 👉Free registration at plantae.org/plantaeprese... #plantscience
Plantae.org@plantaeofficial.bsky.social · 10mo ago📣 Join us for the upcoming Plantae webinar on November 21 at 2:30 pm Eastern time, hosted by the 2025 Plantae Fellows.🌱 👉 Free registration at buff.ly/jaS5hXT #PlantScience
So excited to see my first author paper from my postdoc came out. We identified the vascular cambium stem cell factors CAILs and revealed their positioning mechanism.
Ari Pekka Mähönen@apmahonen.bsky.social · 2y agoFinally out! We identified the stem cell factors (CAILs) of the vascular cambium, and a mechanism involving a ligand sequestration to position the stem cells. This work is a result of fruitful collaboration with @peteretchells.bsky.social and Tusscher labs. 🧵 1/x www.science.org/doi/10.1126/...
Finally out! We identified the stem cell factors (CAILs) of the vascular cambium, and a mechanism involving a ligand sequestration to position the stem cells. This work is a result of fruitful collaboration with @peteretchells.bsky.social and Tusscher labs. 🧵 1/x www.science.org/doi/10.1126/...
Identification of cambium stem cell factors and their positioning mechanism
Wood constitutes the largest reservoir of terrestrial biomass. Composed of xylem, it arises from one side of the vascular cambium, a bifacial stem cell niche that also produces phloem on the opposing ...
science.org
Good week for those interested in oriented divisions and middle cortex formation in the Arabidopsis root. Out in Current Biology: www.cell.com/current-biol...
Three RLKs integrate SHR-SCR and gibberellins to regulate root ground tissue patterning in Arabidopsis thaliana
Chang et al. reveal that ARH1, FEI1, and FEI2 negatively regulate middle cortex formation via modulating the biosynthesis of GA. They elucidate that SHR and SCR negatively control the expression level...
cell.com