有明海のり漁場から分離したあかぐされ病原菌Pythiumに関する研究-5-Pythium porphyraeの卵胞子発芽

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When oospores of P. porphyrae S2 obtained from the culture of corn meal agar were in-cubated in 50% sea water or on semi-solid nutrient medium, the germination of oospores took place by producing zoospores in a vesicle formed by migration of protoplasmic contents of the oospore through a germ-tube. The percentage of germination was higher on nutrient medium such as glucose-nitrate agar, FULLER et al.'s agar or corn meal agar than on sea water agar. The optimal range for germination of oospores was 15-22°C in temperature and 20-60% sea water concentration, and even under such optimal conditions the percentage of germination was less than 20%. Generally, most of thick-walled oospores did not germinate. Since the symptom of red rot appeared on the frond of Porphyra yezoensis in the infection test using oospores as inocula, the zoospores produced by germination of oospores may function as the unit of primary infection.
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