菜豆炭疽病抵抗性の品種間差異に關する研究 : 第2報炭疽病菌の侵入及び細胞組織侵害經過の觀察

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The microscopic investigations were carried out on the process of infection of Colletotrichum Lindemuthianum Briosi et Cavara to the bean varieties being resistant or susceptible to the anthracnose. The observations have been performed upon the appressoria formation of the fungus on the epidermal tissue of bean plants, and upon the invasion and further development of the hyphae in the host tissues as well as the causal morbid changes of the cell-tissues. In the experiments we have used the D-strain of bean anthracnose fungus as the inoculum, and two susceptible varieties i. e., Tenashi-naga-uzura, Hon-Kintoki and 5 resistant varieties i. e., Tenashi-chunaga-uzura, Satisfaction, Indian Chief, Beni-kintoki, O-tebo. On the susceptible varieties, Tanashi-naga-uzura and Hon-kintoki, large sunken reddish-brown lesions having numerous acervuli were formed on the inoculated tissues, while on the resistant varieties, Tenashi-chunaga-uzura, Satisfaction and Indian Chief, very small reddish-brown lesions appeared. In the cases of the highly resistant varieties, Beni-kintoki and O-tebo, no lesion was recognized by naked eyes. The appressoria formation and invasion of the hyphae occurred equally on both susceptible and resistant varieties. More than 70% of the appressoria were formed on the part of middle lamellae of epidermal cells. The protoplasmic morbid changes occurred in the resistant plants, Tenashi-chunaga-uzura, Satisfaction and Indian Chief, were induced very rapidly by invasion of the hyphae and the cells surrounding the point of infection turned brown remarkably. However, the further development of the mycelia in the tissues was checked in general, and the lesions appeared as only very small reddish-brown spots. The similar phenomena were observed in the cases of highly resistant varieties, O-tebo and Beni-kintoki, and the lesions were far more minute owing to fewer number of the browned cells. These minute lesions formed on the highly resistant varieties were almost invisible macroscopically. On the other hand, the protoplasmic morbid changes in the susceptible varieties progressed slowly, and no marked symptom was recognized until the mycelia had developed widely in tissues, and severe destruction of them took place rather suddenly.
日本植物病理学会の論文
1953-03-31

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