イネ白葉枯病病原細菌の寄主体侵入に関する解剖学的観察, とくに萎凋症状株の組織解剖

概要

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The wilting of riceseed11ngs appeared at high rate when inoculated at the four leaf stage in the nursery by immersed in bacterial suspension (10 ce11s/ml) for 16 hours. Most of the 1ower leaves of wilted seed11ngs showed ordinary ye11ow b1ight symptom and the sixth leaves wilted, whereas the fifth leaves did not show any symptoms. Histo1ogical study revealed that the primary infection occurred only at the hydathode of the 1ower leaves which were already deve1oped at the time of inoculation, and that the wilting of the upper leaves was due to the vessel embo1isms caused by the secondary colonization of those infecting bacteria. The reason why the fifth leaf was not wilted, was that the vessels of this leaf are connected with those of the third leaf where bacterial multip1ication was insufficient to induce the wilting. In general, the vessels of the even-numbered leaves did not connect with those of the uneven-numbered leaves. So far as this study, no direct invasion of the bacteria through the roots and the basal parts of the stems was found. In several cases, the rupture of the infected vessels and bacterial exudation to the interce11ar spaces of the parenchyma were observed. The vessels were always ruptured from the inside of the vessels and the infection of the healthy vessels by those exudated bacteria was never recognized.
日本植物病理学会の論文
1968-02-29