イネから分離された Leptosphaeria oryzaecola Hara と Septoria oryzae Cattaneo の同根関係とその病原性

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In September 1978, small, black, spherical granules were discovered on typical elongated lesions of rice blast at paddy rice field in Utsunomiya. These granules were revealed to be ascocarps in which a number of asci were produced. Similar ascocarps were observed again at the same field in 1980. The collection of such ascocarps led to a question concerning possible productivity of the perfect stage of Pyricularia oryzae in natural condition. However, in a course of study, pycnidia ocurred on culture derived from these ascospores, indicating that these ascocarps were independent of the rice blast fungus. The ascocarp, with an ostiole at the end of short beak, is perithecium or pseudothecium partially embedded in the host tissue. Pseudoparaphyses are developed within the ascocarp at maturity. The ascus is cylindrical, hyaline, bitunicate, and contains eight ascospores arranged in two rows. The ascospore is fusiform, light-brown, and separated typically to four cells. This ascomycete was identified to Leptosphaeria oryzaecola Hara. In 1980, on the other hand, pycnidia were found on greyish lesions of leaf blade and on speckled blotches of panicle of rice plant. The coindium borne in the pycnidium is hyaline, oblong to cylindrical, usually composed of three to four cells, and originated monoblastically from conidiogenous cell. This imperfect fungus was identified to Septoria oryzae Cattaneo. These two fungi, L. oryzaecola and S. oryzae, developed similarly to dark brown, cottony colonies on which ascostromata were produced fifty days after inoculation to potato dextrose agar. These ascostromata were those of L. oryzaecola. When the suspension of segmented mycelium of either fungus was spread on a medium, conidia were abundantly produced within pycnidia. These conidia were those of S. oryzae. From these results, it was concluded that L. oryzaecola and S. oryzae, isolated in the present investigation, were mycologically identical, namely, they were perfect and imperfect stages of the same fungus, respectively. It was also ascertained that this fungus was parasitic on rice plant.
日本植物病理学会の論文
1982-01-25

イネから分離された Leptosphaeria oryzaecola Hara と Septoria oryzae Cattaneo の同根関係とその病原性

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