Scientists find the genetic switch that builds tree wood
Pan J, Xu Y, Zhao J, Liu F, Wu S
Plant Signaling
The next time you lean on a wooden fence post or admire a thick tree trunk in the park, you're looking at the end result of a molecular assembly line scientists are just now learning to read and possibly rewire.
Trees build wood by layering tough material called secondary cell walls inside their growing cells, but how a plant decides when and where to do this has been a mystery. By looking at individual cells inside a rubber tree's stem, researchers found a gene called WRKY12a that acts like a foreman, switching on a second gene that triggers wood-hardening lignin production. When they put this gene into lab plants, the plants grew shorter and thinner, showing just how much power this single switch has over how sturdy a plant becomes.
Key Findings
Single-nucleus RNA sequencing mapped distinct cell populations across the cambium-to-xylem developmental trajectory in rubber tree stems, revealing stage-specific activation of secondary cell wall biosynthesis genes.
HbWRKY12a, a transcription factor enriched in fibre-vessel cells, directly binds and activates HbMYB1R1c to drive lignin-associated secondary cell wall deposition.
Overexpressing either HbWRKY12a or HbMYB1R1c in Arabidopsis significantly reduced stem diameter and plant height, and decreased cell wall thickness in fibre, vessel, and pith cells.
chevron_right Technical Summary
Scientists discovered a genetic switch, WRKY12a, that tells rubber tree cells how to build strong wood by triggering a cascade of other genes tied to lignin production, offering a new way to potentially engineer sturdier, more stress-resistant trees.
Abstract Preview
Original paper
Single-Nucleus RNA Sequencing Reveals WRKY12a Regulating Secondary Cell Wall Formation During Xylem Differentiation in Rubber Tree.
Secondary xylem differentiation determines wood structure and function in perennial plants, yet its regulatory mechanisms remain poorly understood in Hevea brasiliensis. Here, we generated a single...
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