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Mitochondrial behaviour during the yeast-hypha transition of Candida albicans.

Yeast cells of Candida albicans were brought to germ tube formation and hyphal growth in liquid synthetic medium. The behaviour of mitochondria and mitochondrial nucleoids (mt-nucleoids) during morphological conversion was examined by fluorescence staining with 2-(4-dimethylaminostyryl)-1-methylpyridinium iodide (DASPMI) and 4',6-diamidino-2-phenylindole (DAPI). Parent yeast cells possessed one or very few branched giant mitochondria which were stained intensely with DASPMI. When a germ tube emerged from the parent cell, one end of a giant mitochondrion extended into the germ tube and developed into the elongated form. In mycelia, apical hyphal cells contained giant mitochondria, whereas older hyphal compartments near the parent cells were vacuolated and possessed small, peripherally located mitochondria. The vacuolated hyphal compartments resynthesized cytoplasm before producing branches and contained giant mitochondria. The cytological model for germ tube formation and hyphal growth proposed by Gow and Gooday (1984) is discussed.