茶白紋羽病に関する研究(第 2 報) : 病原性と接種条件との関係並びに酸素不足状態に於ける菌糸の発育に就て

概要

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I. Difference in the pathogenicity of three cultural strains of Rosellinia sp. was investigated by various conditions of soil inoculation. (1) The seasonal severity of the disease after inoculation appeared in the order of spring or summer, autumn and winter. (2) By soil sterilizations, it was found that there exists an antagonistic condition between soil microbes and present fungus : the disease was less severe in unsterilized soil than when sterilized. (3) More infection occurred in heavier soils; clayish loam over sandy loam. (4) Generally speaking, the severity of present disease was greater in dry soil than in wet soil; in which a ratio of irrigated water was respectively 1 : 1/3∿2/3. (5) Cultural strains R1 and R3 were more pathogenic than R2. Pathogenicity is associated with the lignin decomposing power, and influenced by optimum pH concentration for hyphal growth and reaction of soil used in experiment. II. The influence of oxygen supply for the hyphal growth or survival of Rosellinia sp. was examined by using alkaline pyrogallol. The mycelium of present fungus received a fatal injury by keeping for 3 days in closed PETRI dish devoid of oxygen. The mycelium survived in 1/10 oxygen content of normal air, and continued growth in 1/3 oxygen content of normal air.
京都府立大学の論文
1954-09-01