Role of Polysaccharide Synthesis in Elongation Growth and Cell Wall Loosening in Intact Rice Coleoptiles

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2,6-Dichlorobenzonitrile (DCB) inhibited only increases in levels of the cellulosic polysaccharides while monensin and galactose inhibited increases in levels of both the cellulosic and the matrix polysaccharides in intact rice coleoptiles that were submerged in water. Elongation growth of rice coleoptiles was suppressed by DCB at 10^<-6> M, by monensin at 10^<-7> M, and by galactose at 3×10^<-3> M and above. Thus, the synthesis of both the cellulosic and the matrix polysaccharides is essential for the elongation of intact rice coleoptiles. These inhibitors increased the minimum stress-relaxation time and the relaxation rate and they decreased the mechanical extensibility of the cell wall, indicating that they inhibited cell wall loosening. The concentrations of the inhibitors required for inhibition of cell wall loosening were higher than those for suppression of elongation. The data suggest that polysaccharides synthesis plays two roles in elongation. It keeps the cell wall in a "loosened" condition by producing new extensible cell walls, while its other role is probably related to the fixation or extension of polymers already present in the cell wall.
日本植物生理学会の論文