Cytoskeletons of zoospores of the fungus Phytophthora infestans (Mont.) De Bary treated with dimethylsulfoxide (DMSO) were studied by electron microscopy. High concentrations of DMSO (greater than or equal to 5%) resulted in lysis of the cells and disturbances of the microtubule pattern of flagellar axonemes. Treatment with low concentrations of DMSO (1%-0.1%) induced the formation of bundled intranuclear filaments. It is assumed that these filament bundles should consist of F-actin.

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