稻熱病斑の組織化學的研究 : I. 同一品種上における病斑の進展と病斑上における胞子形成に關する觀察

概要

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Leaf lesions of blast, caused by Piricularia oryzae, on a susceptible variety of rice were grouped into five classes according to the degree of brown coloration and size of the lesions (see Fig. 2) Sporulation process on a single lesion of class 4 was observed and microphotographed at definite intervals. After a lesion was placed in a moist chamber, specially designed for the present purposs as shown in Fig. 1, a conidiophore began to emerge in about six hours, and produced the first conidium at ?its apex one hour later which reached its full size in 40 minutes. Soon after, a branch developed from the conidiophore just below the point of attachment of the first conidium, and the second conidium was formed at its apex. In the same manner, process of conidial formation continued to form 7 to 9 conidia on one conidio-phore, each being formed at about an hour's interval. The mode of branching of the conidio-phore is sympodial in accord with the observations of Henry et al. (1948). Sporulation intensities of lesions of different classes were compared. Sporulation was most rapid and abundant on 4, less on 5 and 3, and very scarce in 2, whereas entirely absent on 1. It seems likely that the browning of the lesion could retard the spread and normal growth of the mycelia in the host tissue, and, consequently, the sporulation on the lesion.
日本植物病理学会の論文
1952-12-30