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

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)

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