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Studies on the Helminthosporium leaf blight of rice plant. 3. Some histological observation on the inner epidermal tissues of leaf sheaths inoculated with the blight fungus



Studies on the Helminthosporium leaf blight of rice plant. 3. Some histological observation on the inner epidermal tissues of leaf sheaths inoculated with the blight fungus



Sci Repts Res Inst T6hoku Univ Ser D Agric 11(2): 97-107



Cellular alterations of the host and behavior of the invading pathogen in the blight-inoculated tissue of the inner epidermis of the leaf sheath were investigated microscopically with special reference to the development of lesions. The blight spore settled on the epidermal surface germinates after 3 hours' incubation at 24[degree] C and forms appressoria usually at the juncture of cell walls. The infection hypha haying emerged from the underpart of the appres-sorium finds its way into the middle lamella (formation of infection cavity) and invades the host cell. The nuclei of the host cells tend to migrate toward the infected cell or the invading hypha. The infected cells discolor and begin to granulate. In the early stage the infected cells show a rapid necrotic reaction. Small necrotic brown areas are usually found about 5 hours after inoculation, but they do not enlarge further. Host cells around the necrotic cells seem to be still alive even after about 40 hours. Conidiospores and appressoria on the necrotic cells remain alive. Another type of lesion occurs about 5 hours after inoculation. A slight discoloration of the infected cells may be seen before complete invasion. Secondary intracellular hyphae spread well into neighboring cells. With gradual darkening of the necrotic host cells their development seems to be arrested. Then they often turn into pale brown thick-walled mycelia, from which conidiospores sometimes may be formed within 3 days.

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Studies on Helminthosporium leaf blight of Rice plant. Part 3. Some histological observation on the inner epidermal tissues of leaf sheaths inoculated with the blight fungus. Rep. Inst. agric. Res. Tohoku Univ, 11: 2, 97-103, 1960

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