Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Organ / tissue: stem,
cell wall
NCBI PubMed ID: 16667151Journal NLM ID: 0401224Publisher: American Society of Plant Biologists
Institutions: Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Naka-ku, Hiroshima 730, Japan
Grass culms are known to differ in breaking strength, but there is little physicochemical data to explain the response. The fourth internode of four brittle and two nonbrittle barley (Hordeum vulgare L.) strains were used for physical and chemical studies of culm strength. Inner and outer culm diameters of brittle strains (3.6 +/- 0.2 and 5.0 +/- 0.1 millimeters) were not significantly different from those of nonbrittle strains (3.9 +/- 0.2 and 5.2 +/- 0.2 millimeters). Maximum bending stress, at which the culm was broken, was 192 +/- 34 g/mm(2) for brittle and 490 +/- 38 g/mm(2) for nonbrittle strains. Wall thickness and cell dimensions of epidermal, sclerenchyma, and parenchyma cells were measured in culm cross sections. The area of cell wall per unit cell area for each tissue was significantly correlated with the maximum bending stress (r = 0.93 for epidermis, 0.90 for sclerenchyma, and 0.84 for parenchyma). Cell walls of brittle culms had 6 to 64% as much cellulose content as those of nonbrittle culms. Maximum bending stress correlated significantly with cellulose content of the cell walls (r = 0.93), but not with the contents of noncellulosic compounds. The lower cellulose content of the brittle culm was significantly correlated with brittleness.
Structure type: homopolymer
Trivial name: cellulose, β-(1,4)-glucan, cellulose, β-(1,4)-glucan
Compound class: EPS, O-polysaccharide, cell wall polysaccharide, glucan, polysaccharide
Contained glycoepitopes: IEDB_142488,IEDB_146664,IEDB_983931,SB_192
Comments, role: Parent molecule: cellulose
NCBI Taxonomy refs (TaxIDs): 4513Reference(s) to other database(s): GTC:G75830OM, GlycomeDB:
27885, CCSD:
50051, CBank-STR:4229
Show glycosyltransferases
There is only one chemically distinct structure:
Found 
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