Morphology of mitochondrial nucleoids, mitochondria, and nuclei during meiosis and sporulation of the yeast Saccharomycodes ludwigii

The Journal of General and Applied Microbiology

Isamu Miyakawa²  Ayumi Nakahara¹  Kohei Ito¹ 

[1] Department of Biology, Faculty of Science, Yamaguchi University;Department of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University

关键词: DAPI;    meiosis;    mitochondria;    mitochondrial nucleoids;    Saccharomycodes ludwigii;    sporulation;   

DOI  :  10.2323/jgam.58.43

学科分类：微生物学和免疫学

来源: Applied Microbiology, Molecular and Cellulrar Biosciences Research Foundation

【 摘 要 】

The morphology of mitochondrial nucleoids (mt-nucleoids), mitochondria, and nuclei was investigated during meiosis and sporulation of the diploid cells of the ascosporogenic yeast Saccharomycodes ludwigii. The mt-nucleoids appeared as discrete dots uniformly distributed in stationary-phase cells as revealed by 4′,6-diamidino-2-phenylindole (DAPI) staining. Throughout first and second meiotic divisions, the mt-nucleoids moved to be located close to the dividing nuclei with the appearance of dots. On the other hand, mitochondria, which had tubular or fragmented forms in stationary-phase cells, increasingly fused with each other to form elongated mitochondria during meiotic prophase as revealed by 3,3′ -dihexyloxacarbocyanine iodide [DiOC6(3)] staining. Mitochondria assembled to be located close to dividing nuclei during first and second meiotic divisions, and were finally incorporated into spores. During the first meiotic division, nuclear division occurred in any direction parallel, diagonally, or perpendicular to the longitudinal axis of the cell. In contrast, the second meiotic division was exclusively parallel to the longitudinal axis of the cell. The behavior of dividing nuclei explains the formation of a pair of spores with opposite mating types at both ends of cells. In the course of this study, it was also found that ledges between two spores were specifically stained with DiOC6(3).

【 授权许可】

Unknown