ノリ糸状体の黄斑病に関する研究-I : 発病に及ぼす光の影響
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概要
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Relationship between the development of Yellow Spot Disease of conchocelis and light conditions during the preculture period in normal seawater and the latent period in pathogenic water was investigated. It is thought that light during the latent period may be directly related to the mechanism of attack of the disease and that during preculture may control the susceptibility of conchocelis to the disease, owing to its varing influence on growth and physiological conditions. The induced infection experiment was carried out in pathogenic water under natural sunlight (ca. 100 lux) at 25°C. The results obtained are as follows: 1. Of the conchocelis precultured under continuous illumination of 250, 1000 or 3000 lux for 10 days after budding of the carpospores, the one cultured unde 100 lux light was the most susceptible to the disease. 2. Susceptibility to the disease decreased with the prolongation of the preculture period, when conchocelis were precultured for 14, 24 or 50 days after budding under a continuous illumination of 1000 lux. 3. The susceptibility of conchocelis to the disease decreased gradually when they were kept in the dark. 4. An illumination of 500 lux during the latent period completely inhibited the attack of the disease, regardless of light conditions during preculture. From this fact it seems that the effect of light for latent period differs in quality from that for preculture period. 5. Under most suitable light conditions during the latent period, susceptible conchocelis always showed typical symptoms with the disease rate of 100%. This fact may indicate that conditions of host and light are established to be complementing factors that invite attack by the pathogen.
- 公益社団法人 日本水産学会の論文