Culm Brittleness of Barley (<i>Hordeum vulgare</i> L.) Mutants Is Caused by Smaller Number of Cellulose Molecules in Cell Wall
Akira Kokubo, Naoki Sakurai, Susumu Kuraishi, Kazuyoshi Takeda
PLANT PHYSIOLOGY
Abstract
The physicochemical nature of the cell wall was determined in the fourth internode of three isogenic brittle mutants of barley (Hordeum vulgare L.) and corresponding nonbrittle strains. Cellulose contents of the brittle culms were 17.5 to 20.3% of those of corresponding nonbrittle strains. No major difference was found in lignin and noncellulose components (except glucose) between brittle and nonbrittle strains. Maximum bending stresses of brittle culms were 38.0 to 54.2% of those of corresponding nonbrittle strains. The degree of polymerization of cellulose, measured by viscometry, was similar between the brittle and the nonbrittle strains. Mole number of cellulose molecules in a unit length of brittle culms, calculated by dividing cellulose mass by molecular weight, was 7.7 to 17.3% of those of the nonbrittle strains. These results indicate that brittleness of mutant culms is due to fewer numbers of cellulose molecules in the cell walls.
Extracted Claims
3 claims extracted from this paper into the knowledge graph
mole number of cellulose molecules is lower in brittle culms
“Mole number of cellulose molecules in a unit length of brittle culms, calculated by dividing cellulose mass by molecular weight, was 7.7 to 17.3% of those of the nonbrittle strains.”
maximum bending stress is lower in brittle culms
“Maximum bending stresses of brittle culms were 38.0 to 54.2% of those of corresponding nonbrittle strains.”
cellulose content is lower in brittle culms
“Cellulose contents of the brittle culms were 17.5 to 20.3% of those of corresponding nonbrittle strains.”