Fig. 3.

Light micrographs showing transverse views of cambium collected from heated and non-heated stems of Cryptomeria japonica and Abies firma. (A, B) Before the start of heating, cambial cells were arranged very compactly and the cambial zone consisted of four or five layers of fusiform cambial cells in stems of C. japonica (A) and in A. firma (B), respectively. (C, D) New cell plates (arrowheads) were evident in cambial cells on 14 January 2007 (C) and on 15 January 2010 (D) in the respective species. (E, F) On the same dates, the cambium was dormant in non-heated stems of C. japonica (E) and Abies firma (F), respectively. Abbreviations: C, cambium; Ph, phloem; Xy, xylem. Scale bars = 100 µm.