American chestnut is recognizing and
responding to the blight fungus equally
as fast as Chinese chestnut.This
implies that chestnut has a different
mechanism of resistance to blight than occurs in biotrophic and hemibiotrophic pathosystems, where all
resistance appears to be based
on recognition of the pathogen and where avirulence involves suppression of ÒantigenÓ display.Chestnut blight resistance may or may not be more stable than resistance to
biotrophs, but it is hard to imagine
it being less stable.
Histopathology on older cankers was also
helpful to me in understanding
what is occurring inside cankers with various morphologies, facilitating interpretation.