Summary
The lignification process in different morphological regions of loblolly pine tracheids was studied by the SEM-EDXA technique. Prior to S2 layer formation, lignification was initiated in the cell corner middle lamella and compound middle lamella regions. Subsequently a rapid lignin deposition was observed in both regions, whereas secondary wall lignification was a more gradual process and initiated when the middle lamella lignin concentration was approximately 50% of maximum. Within the secondary wall, the S1 layer is lignified first. Then, lagging just behind cell wall formation, lignification of the S2 layer is initiated adjacent to the S1 layer and extends toward the lumen. Finally, the S3 layer lignified. Upon completion of lignification, the cell walls had a higher concentration of lignin in both the S1 and S3 layers than in the S2 layer.
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This Paper is an excerpt from the Ph.D. dissertation of Shiro Saka
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Saka, S., Thomas, R.J. A study of lignification in loblolly pine tracheids by the SEM-EDXA technique. Wood Sci.Technol. 16, 167–179 (1982). https://doi.org/10.1007/BF00353866
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DOI: https://doi.org/10.1007/BF00353866