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Ultrastructure of the S2 layer in relation to lignin distribution inPinus radiata tracheids
Journal of Wood Science volume 48, pages 95–98 (2002)
Abstract
The ultrastructure of the S2 layer in relation to its lignin distribution was examined using transmission electron microscopy in the tracheids ofPinus radiata. The S2 layer had a striated appearance at low magnification. Observations at higher magnifications showed lignin to be distributed inhomogeneously in this layer, appearing as a mosaic of electron-dense and electron-lucent regions. These regions are scattered, showing a pattern of often interconnecting sinuous features in a predominantly radial profile. The significance of these features of the S2 layer is discussed, particularly in relation to the available information from recent ultrastructural observations on the appearance of cellulose microfibrils and the pattern of their distribution in the S2 layer using rapid freeze-deep etching in conjunction with transmission electron microscopy. Predictions are made as to the likely distribution and arrangement of cellulose microfibrils in the S2 layer based on the pattern of lignin distribution observed in this layer.
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Singh, A., Daniel, G. & Nilsson, T. Ultrastructure of the S2 layer in relation to lignin distribution inPinus radiata tracheids. J Wood Sci 48, 95–98 (2002). https://doi.org/10.1007/BF00767284
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DOI: https://doi.org/10.1007/BF00767284