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.