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Fig. 2 | BMC Plant Biology

Fig. 2

From: Tracheid cell-wall structures and locations of (1 → 4)-β-d-galactans and (1 → 3)-β-d-glucans in compression woods of radiata pine (Pinus radiata D. Don)

Fig. 2

Micrographs of transverse sections of OW and three CWs showing tracheid wall structures. The main panels show transmission electron micrographs of OW (a), MCM1 (b), MCW2 (c) and SCW (d). In all wood types, the middle lamella is clearly differentiated from the primary wall (P) around the cells and at the cell corners (MLCC). All tracheid walls have a S1 and S2 layer, but an S3 layer is present in only OW (a) and MCW1 (b). Warts (W) are observed on the tracheid wall surface adjacent to the cell lumen in only OW (a). Helical cavities (HC) are present in the inner region of the S2 layer (S2i) in only SCW. Intercellular spaces (IS) are present between tracheids in only MCW 2 (c) and SCW (d). Micrographs obtained using a Leica confocal microscope. Scale bar: 1 μm. The insets show differential interference contrast micrographs. These particularly show the S1 and S3 layers in OW (a) and MCW1 (b) and helical cavities in SCW (d). All sections were from Tree 1. Scale bar: 5 μm

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