Downward movement of the domain pattern in Aesculus cambium producing wavy-grained xylem

Abstract

Cambium producing wavy xylem in Aesculus is characterised by a domain structure, that is “right” (Z) and “left” (S) areas of orientation of morphogenic processes occur in it. The domain pattern in the form of transversely running stripes of Z and S type moves down the trunk at a rate of 0.2 mm per year or 0.1 mm per 1 mm of produced xylem. The domain pattern finds its reflection in the wavy arrangement of the xylem cells, and the shift of domains is manifested din the oblique course of the undulations an the radial-split face of the xylem.