Effect of Ions on the Orientation of Cortical Microtubules in Spirogyra Cells
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Effects of ions on the orientation of cortical microtubules (MTs) in Spirogyra cells were studied. After depolymerization with amiprophos-methyl (APM), MTs were allowed to reorganize in NaCl solutions of various concentrations. As the concentration of NaCl increased, the frequency of cells that had oblique MTs increased. When cells in NaCl solution were transferred into artificial pond water (APW) and incubated for 6 h, all the MTs changed to become transverse to the longitudinal axis of the cell. KCl and MgCl_2 also had effects on the orientation of MTs. However, NH_4Cl, CaCl_2, CoCl_2, and Co(NO_3)_2 did not show any effect. These results suggest that Na^+, K^+, and Mg^<2+> have effects on MT orientation and that NH^+_4, Ca^<2+> Co^<2+> Cl^-, and No^-_3 have little effect. When MTs were reorganized in either NaCl or KCl solutions, all the oblique MTs were organized into an S-helix. In contrast, some of the oblique MTs were found as a Z-helix in the cells incubated in MgCl_2 or mannitol solutions. These results suggest that effects of Na^+ and K^+ on the orientation of MTs are not the same as those of Mg^<2+> and mannitol. These results provide the first evidence that ions are involved in the orientation of MTs in algae.
- 日本植物生理学会の論文
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