Effects of Varying Temperature, Salinity, and Acidity in the Treatment of Porphyra Infected by Red Rot Disease.

概要

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In an attempt to identify conditions effective in suppressing fungal red rot disease in the seaweed <I>Porphyra</I>, acid washes (5 min treatments) were conducted under different regimes of temperature (-5 to 15°C), pH (1.63 to 2.0) and salinity (5 to 25%). After treatment, the seaweed thalli were placed in cultivation tanks (15°C, 2.7% salinity) and monitored for the development of fungal growth. Optimum conditions for treating thalli were found using washes of seawater at high salinity (15%), low pH (1.63) and low temperature (-5°C). After this treatment, thalli grow in the cultivation tanks and showed a slight suppression of red rot disease.<BR>However, this treatment was only marginally more effective than an acid treatment alone (using seawater adjusted to pH 2.0). When densities of fungal zoospores were high, both these treatments were ineffective in suppressing the disease. Instead, an effective sequential treatment was devised. Thalli were acid washed using seawater adjusted to pH 2.0 for 5 min and subjected to a seawater at high salinity (20%) for 5 min 4 days later. This combination of treatments was found to be very effective in suppressing the development of red rot disease in this seaweed.
日本水産増殖学会の論文