Document Detail

Roles of cellulose and xyloglucan in determining the mechanical properties of primary plant cell walls
MedLine Citation:
PMID:  10517858     Owner:  NLM     Status:  Publisher    
The primary cell walls of growing and fleshy plant tissue mostly share a common set of molecular components, cellulose, xyloglucan (XyG), and pectin, that are required for both inherent strength and the ability to respond to cell expansion during growth. To probe molecular mechanisms underlying material properties, cell walls and analog composites from Acetobacter xylinus have been measured under small deformation and uniaxial extension conditions as a function of molecular composition. Small deformation oscillatory rheology shows a common frequency response for homogenized native cell walls, their sequential extraction residues, and bacterial cellulose alone. This behavior is characteristic of structuring via entanglement of cellulosic rods and is more important than cross-linking with XyG in determining shear moduli. Compared with cellulose alone, composites with XyG have lower stiffness and greater extensibility in uniaxial tension, despite being highly cross-linked at the molecular level. It is proposed that this is due to domains of cross-linked cellulose behaving as mechanical elements, whereas cellulose alone behaves as a mat of individual fibrils. The implication from this work is that XyG/cellulose networks provide a balance of extensibility and strength required by primary cell walls, which is not achievable with cellulose alone.
Whitney; Gothard; Mitchell; Gidley
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Publication Detail:
Journal Detail:
Title:  Plant physiology     Volume:  121     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  1999 Oct 
Date Detail:
Created Date:  1999-10-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  UNITED STATES    
Other Details:
Languages:  Eng     Pagination:  657-64     Citation Subset:  -    
Unilever Research Colworth, Colworth House, Sharnbrook, Bedford MK 44 1LQ, United Kingdom.
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