By rhodamine-phalloidin fluorescence, distinct continuous F-actin rings were visualized in 18-20% of the protoplasts of Schizosaccharomyces pombe and S. japonicus var. versatilis, in addition to randomly distributed F-actin dots. Whereas the reversion of ring-lacking protoplasts coincided with the polarization of the dotted F-actin pattern, the ring-containing protoplasts became furrowed as the F-actin rings constricted. The furrowing was more conspicuous in S. japonicus var. versatilis than in S. pombe protoplasts and it was blocked when the reversion was inhibited by Novozyme 234 indicating that the cell wall formation is essential for the F-actin ring constriction.

Institute of Microbiology Czechoslovak Academy of Sciences Prague

References provided by Crossref.org

Colocalization of cortical microtubules and F-actin in Dipodascus magnusii using confocal laser scanning microscopy