ノリ糸状体の黄斑病に関する研究-III : 発病におよぼす水質の影響

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Aquatic factors that influence the development of yellow spot disease in Porphyra conchocelis were examined. 1. When sterilized water drawn from a culture container in which the disease conchocelis inoculated with the fractionated pathogen complex suffered from the disease. On the other hand, when the inoculated conchocelis were kept in fresh sea water, they did not suffer from the disease at all. There was remarkable difference between the srerilized culture water and the fresh seawater in their respective COD values and NO3-N concentrations; i.e., the COD value and NO3-N concentration was comparatively high in the sterilized culture water and low in the fresh seawater. 2. The appearance of the symptoms on inoculated conchocelis was affected by the NO3-N concentration and the amount of laver extract which were added to the culture water; i.e., the appearance of the symptom was restained at NO3-N 100μg at./liter or the laver extract 1.25g/liter, was not always restained at NO3-N lower than 100μgat./liter or the laver extract lower than 1.25g/liter, and was scarcely restained and spread quickly at NO3-N higher than 500μgat./liter or the laver extract 2.5g/liter. 3. The appearance of the symptom on incoulater conchocelis was not restained at pH 5.0 in culture water, and restained at the pH value higher than neutral.
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