Modification in Cell Shape Unrelated to Cellulose Microfibril Orientation in Growing Thallus Cells of Chaetomorpha moniligera

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Cellulose microfibril patterns in thallus cell of Chaetomorpha moniligera were studied, and the relationship between the microfibril and the peripheral microtubule arrangements during cell-shape modification by colchicine was examined. In the cuttings from growing thalli, linearly arranged cylindrical cells developed into cask-shaped cells during 4-6 days of culture at 27℃. In the cylindrical cells, microfibrils forming the innermost portion of the wall were arranged alternately in longitudinal and transverse directions, but peripheral microtubules were always arranged only in a longitudinal direction. These features were also noted in the cask-shaped cells. Colchicine at 10^<-3> M and 3 × 10^<-3> M accelerated both cell expansion and wall thickening with matrix deposition, but the directions in which both microfibrils and microtubules were arranged were the same as those of the cylindrical cells. These results indicate that (1) the microfibril and microtubule arrangements of Chaetomorpha are not necessarily correlated, (2) changes in cell shape of Chaetomorpha are not necessarily accompanied by changes in the arrangement of cell-wall microfibrils, and (3) colchicine plays a role in the loosening and thickening of cell walls by enhancing matrix deposition.
日本植物生理学会の論文