Abstract
Cells of Chlamydomonas reinhardtii Dangeard were synchronized under a 12 hour light: 12hour dark regimen.Behavior of mitochondria in these synchronized cells was examined by fluorescence microscopy using a mitochondrial membrane-binding fluorescent dye, DASMPI, as a specific vital stain as well as by electron microscopy. Three-dimensional models of mitochondria in synchronized cells of C. reinhardtii were constructed from their electron microscopic profiles in serial cell sections using the computer graphics techniques. Based on these observations, the mitochondrial morphologies of C. reinhardtii in the cell cycle were classified into five types. These results were discussed in relation with those reported by previous workers.