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Fig. 4. Light micrograph of longitudinal section through tissue
undergoing dedifferentiation during generation of new phellogen after mechanical wounding
of bark of healthy 2-year-old peach bark. Outside bark in all figures is oriented toward
top of plate. Bar = 10 microns. Fig. 4 shows section through periderm and cortex 72 hr
postwounding showing two distinct tissue regions in the transition zone between healthy
(left) and necrotic tissue (right). Tissue to the right of the arrows shows first positive
reaction with phloroglucinol + HCl but is not yet impervious to fluid diffusion.
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