ノリ病害の細菌学的研究-3 : 漁場海水とノリ葉体における細菌類の消長,特に病害関連細菌類の検出
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An epidemiological survey on the bacteria associated with laver-diseases was carried out with the sea water and laver fronds in Hama culture field, Saga, during the farming of laver. The total heterotrophic bacteria were numerously found in sea water during the growth of laver frond and its harvest, namely from November to December. Chitinoclasters of bacteria were already distributed on laver buds at an early stage of cultivation. Whereas, xylan-decomposing bacteria were detected mainly from late November to January in sea water as well as in laver fronds. In semi-selective isolation of bacteria associated with disease, 26 of 56 strains isolated were positive in the test of inoculation in vitro. Vibrio, causing green rot-like disease, were isolated from some diseased fronds, white rot, and also a healthy frond. Some strains of Agarbacterium and Beneckea were detected and identified. Some chitinoclasters, causing frond reddening, are not yet identified. The strains of Vibrio, Agarbacterium and Beneckea which were associated with laver-diseases were similar or related to the bacteria included in the phenons reported previously.漁場海水中の細菌数は,ノリ盛期・摘採期に多く,104/ml前後に増加し,葉体の菌相を見ると漁期初期にはキチン分解細菌の着生を,11月に入るとキシラン分解細菌が増加した。半選択的に検出した菌株の発病・性状試験から病害関連細菌Vibrio, AgarbacteriumおよびBeneckeaの諸型と少数の赤変型未同定キチン分解細菌が現場ノリ罹病葉に存在することを確認した。あわせてノリの細菌性疾病の成因について若千の考察を試みた。
- 長崎大学水産学部の論文
- 1973-12-00
長崎大学水産学部 | 論文
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