イネごま葉枯病に関する病理解剖学的研究 : 1. 病原菌のイネ苗子葉鞘上での行動とその微細構造

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The behaviors of conidia of Helminthosporium oryzae Ito et Kuribayashi on coleoptiles of two rice varieties, resistant (Kameji) and susceptible (Shiga Asahi No. 27) were compared by using 1ight microscope. Conidia germinated on the coleoptiles of both varieties to almost the same percentage, whereas the length of germ tubes was shorter and the percentage of appressorium formation was sma11er on the coleoptile of resistant variety than those on the coleoptile of susceptible one. On the other hand, the fine structure of a germ tube, appressorium, invading hypha of the causal fungus and the host ce11s (Shiga Asahi No.27) were observed under the electron microscope. Mature germ tubes and appressoria formed on both varieties gained a two-1ayered ce11-wa11, 0.2μ in thickness. The outer layer was thin and electron-dense, and the inner layer thick and electron-transeparent when stained with potasium perma nganate and osmium tetroxide. The ce11 wa11 of immature germ tubes, however, possessed only a mucilaginous inner layer. This substance was further detectable around germ tubes and appressoria, and appears to serve for the attachment of these to the epidermal ce11 wa11. When an appressorium firmly attaches the epidermal ce11 wa11, the pectic layer is resolved and the cuticle layer is often ruptured just around the appressorium by being pu11ed up with the mucilage. The epidermal ce11 wa11s of the resistant variety was thicker than those of the susceptible one by about 27 per cet.
日本植物病理学会の論文
1968-01-31

イネごま葉枯病に関する病理解剖学的研究 : 1. 病原菌のイネ苗子葉鞘上での行動とその微細構造

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