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-I
一般菌学的性状
1976 年 42 巻 10 号 p. 1183-1188
詳細
1976 年 42 巻 10 号 p. 1183-1188
Laver red rot caused by parasitic fungi is one of the serious epidemic in laver cultures. A survey of this disease pathegen was made by isolating causative fungi directly or selectively from infected Porphyra yezoensis collected from Ariake Sea farms of Kyushu. Twenty-one strains of iselates were positive in the infection test and morphologically similar to each other . In this area, Pythium seemed to be the most prevalent pathogen for red rot since 5 representative strains belonged to this genus.
These 5 strains were related taxonomically to Pythium porphyrae which had been found in Miyagi Prefecture of Tohoku. In comparative culture tests, they differed from P. porphyrae by the production of branched filamentous sporangia, catenulate conidia and short and/or stout evacuation tubes, the appearance of colonies and the rapidity of mycelial growth. However, they resembled 2 strains of Pythium from Fukushima Prefecture of Tohoku.
