Transformation of the domain pattern in the developmet of Fagus silvatica L. cambium

Abstract

The domain pattcrn of cambium during the first year of its function in Fagus silvatica L. resemblcs a chcckerboard. The longitudinal line along the lcaftracc, its corrcsponding line on the opposite side of the internode and nodcs comprise the domain borders. Starting from the formation of the first annual ring, this checkerboard paltem bcgins to undergo graduał transformation. A transitional domain pat.tern appears during the first few years; in each internodc, duc to the altcmate disappearancc of Z and S domains, a fragmentary domain of one typc and an expanded domain of the opposite type occur in pairs. After further transformations, a ri:gular pattcm of transverse bands of domains moving along the stem appear on older stems (over ten years-old). T􀀾is pattern \s commonly found in othcr studied species of trees.