PtrSHR1 coordinates vascular cambium proliferation and xylem lignin biosynthesis to regulate wood formation in Populus trichocarpa.
Zhao J, Chen Y, Dai X, Su L, Zhai R
Crispr
Trees in your local park, the wood in your furniture, and the paper in your books all depend on the same biological process this gene controls — and understanding it could lead to faster-growing trees that store more carbon or produce cleaner biofuels.
Inside every tree trunk is a thin ring of special cells that constantly divide to make new wood. Researchers found a single protein that travels from this dividing zone into the surrounding wood-building cells, acting like a foreman who both manages the size of the workforce and decides what kind of wood gets built. When they used gene-editing tools to turn this protein up or down, trees grew noticeably fatter or thinner, and the chemical makeup of their wood changed measurably.
Key Findings
CRISPR knockout of PtrSHR1 expanded the wood-producing cambium zone and increased stem diameter, while overexpression shrank both — demonstrating direct genetic control over trunk girth.
The PtrSHR1 protein is made in the cambium but physically moves into the xylem (wood tissue), where it switches on exactly 3 of 22 lignin-building genes to fine-tune wood chemistry.
Chemical and 2D NMR analyses confirmed that PtrSHR1 manipulation produced measurable changes in lignin content and structure, validating this pathway as a target for engineering wood composition.
chevron_right Technical Summary
Scientists discovered a single gene in black cottonwood trees that acts as a master switch for wood formation — controlling both how many wood-producing cells a tree makes and the chemical composition of the wood itself. By dialing this gene up or down, researchers could produce trees with thicker or thinner trunks and altered lignin content, opening new possibilities for engineering better timber and biofuel crops.
Abstract Preview
Vascular cambium produces cells to form xylem, or wood, in tree stems. Here we explored transregulatory pathways in this cell lineage development. We tested 20 of the 95 putative vascular cambium-s...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Populus trichocarpa, the black cottonwood, western balsam-poplar or California poplar, is a deciduous broadleaf tree species native to western North America. It is used for timber, and is notable as a model organism in plant biology. The tree is notable for the seed-carrying cottony fluff it rele...