Journal
PHYTOCHEMISTRY
Volume 57, Issue 6, Pages 859-873Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0031-9422(01)00049-8
Keywords
lignification; lignin topochemistry; lignin distribution; monolignol; guaiacyl; syringyl; p-hydroxyphenyl; angiosperms; gymnosperms; reaction wood; ultrastructure
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This review discuses the ultrastructural aspects of cell wall lignification and lignin topochemistry. Lignification results from the enzyme mediated polymerization of monolignols initiated by unknown factors (initiation sites) located at the corners of cells and in the middle lamella. Lignification results in the filling of pores within the carbohydrate matrix following a sequence from the outer regions of the wall towards the lumen. The amount and chemical characteristics of lignin vary across the cell wall, with the presence of reaction wood. and among cell types. (C) 2001 Elsevier Science Ltd. All rights reserved.
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