Collateral flow

"Fluorescent dye bypasses an injury on the main vein of a dicotyledonous leaf."

An interesting visualization of how nutrient flow can bypass an injury by travelling through collateral channels.  The same thing happens in the human body.  Not indicated at the source is information as to whether the lesion was acute and the collaterals preexisting, or whether the hole was created slowly, inducing the bypass channels to develop; judging by the pattern proximal to the injury, I would guess the former.  Very interesting in any case.

Click photo to enlarge.

Image courtesy of E.Katifori/Rockefeller University, via Fresh Photons.