PubMed · 2026-06-24
Scientists studying how leaf veins form found that the stunning variety of vein patterns in plants—from grass stripes to oak mesh—likely arises from differences in how leaves grow, not from fundamentally different biological blueprints for making veins.
Leaf vein patterns (grids vs. webs) are not produced by different biological mechanisms—they likely result from a single shared vein-patterning process shaped by different leaf growth patterns.
The distinctive vein arrangements seen across plant groups evolved independently multiple times, suggesting convergent evolution driven by growth geometry rather than novel patterning genes.
The identification of 'vein precursor cells' in developing leaves is currently inconsistent across studies because researchers emphasize different cellular features, making cross-species comparisons unreliable.
