1. Zoospores germinate rapidly and semi-synchronously upon exposure to growth medium or an inorganic salts solution. Amino acid incorporation into protein is detected only after a characteristic lag period, the extent of which is a function of developmental, rather than absolute, time. 2. The ' turn-on ' of amino acid incorporation occurs after several of the morphological events of germination have taken place- notably, retraction of the flagellum, conversion to a spheroid cell morphology, vesicle fusion with the plasma membrane, formation of the initial cell wall, and elongation of the single mitochondrion. A second group of morphological changes- release of ribosomes from the nuclear cap into the cytoplasm, appearance of multiple mitochondrial profiles, disappearance of the flagellar axoneme, and disappearance of gamma particles- takes place in the cell population during the turn-on of incorporation. 3. Cycloheximide reversibly inhibits germination at a characteristic block point. Inhibited cells accomplish all the known morphological events of germination except the disappearance of the flagellar axoneme and the formation of the germ tube. Amino acid incorporation is inhibited to undetectable levels in growth medium and by about 80 % in the inorganic salt
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