Abstract
Electron microscope studies of Sitka spruce have been undertaken to observe the sequence of cellular development following grafting. Observations at the graft interface reveal a recovery and regeneration sequence associated with union formation. Xylem elements differentiated directly from the vascular cambia of the rootstock and scion are different from elements arising from parenchymatous callus derived from ray parenchyma, which may be produced in an attempt to establish a connecting water conducting system as rapidly as possible. Failure to form such a system may be a primary cause of graft failure.
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