 Re: longer cuts on poor compartmentalizers| CODIT WALL4
So first question is why is this very interesting discussion buried in the picture forum? We just found it. We were trying to track down my wayward professor. LOL
Actually, I really thought I understood this whole concept of CODIT fairly well. Now I'm pretty much confused again.
When I first started studying, the definition that I saw was (for Wall 4) "the new growth ring that forms after injury". Which would support Ekka's views, right? Further reading also says that this barrier zone separates tissue formed after wounding from that formed earlier. That it is chemically strong but structurally weak (hence the tendency toward ring shakes at those points). The pointers shown in pictures show the dark ring within the tree that describes the time of injury, delineating the "outward" growth on beyond the point of injury. (Not the callus growth area.)
You can see this reaction zone in the attached picture. If the injury is not too severe, this zone may be seen encompassing the entire diameter. In this case, the injury was severe compared to the size of the tree at the time.
If I am understanding this correctly, there is no callus growth covering the injury; and yet, you can see the reaction of "Wall 4" by the discoloration of that growth ring.
S Mc |