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)

Table 1 Characteristics of the three grades of compression woods (CW) and opposite wood (OW)

	Characters
Wood types	Lignification of compound middle lamella at cell corners	Lignification of S2L at cell corners	Lignification of S2L around cells	Intercellular spaces
Opposite wood (OW)	+++	-	-	-
Mild compression wood 1 (MCW1)	++	+	-	-
Mild compression wood 2 (MCW2)	+	++	++	++
Severe compression wood (SCW)	-	+++	+++	+++

-, no lignin autofluorescence/intercellular spaces absent; +, weak lignin autofluorescence; ++, moderate lignin autofluorescence/moderately frequent intercellular spaces; +++, strong lignin autofluorescence/numerous intercellular spaces

ISSN: 1471-2229