Table 19-8The Polymers of the Plant Cell Wall

POLYMERCOMPOSITIONFUNCTIONS
Celluloselinear polymer of glucosefibrils confer tensile strength to all walls
Cross-linking glycansxyloglucan, glucuronoarabinoxylan, and mannanscross-link cellulose fibrils into robust network
Pectinhomogalacturonans and rhamnogalacturonansforms negatively charged, hydrophilic network that gives compressive strength to primary walls; cell-cell adhesion
Lignincross-linked coumaryl, coniferyl, and sinapyl alcoholsforms strong waterproof polymer that reinforces secondary cell walls
Proteins and glycoproteinsenzymes, hydroxyproline-rich proteinsresponsible for wall turnover and remodeling helps defend against pathogens

From: The Plant Cell Wall

Cover of Molecular Biology of the Cell
Molecular Biology of the Cell. 4th edition.
Alberts B, Johnson A, Lewis J, et al.
New York: Garland Science; 2002.
Copyright © 2002, Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, and Peter Walter; Copyright © 1983, 1989, 1994, Bruce Alberts, Dennis Bray, Julian Lewis, Martin Raff, Keith Roberts, and James D. Watson .

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