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Cytological Characteristics of Infection Process by Rhizoctonia solani in Rice
Guo-Liang Zhang1,2*, Da-Wei Yan2, Zu-Hua He2*
1College of Life Science and Chemistry Engineering, Huaiyin Institute of Technology, Huai,an 223003, China; 2Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Scienc
Abstract: Cytological characteristics of infection process by Rhizoctonia solani in rice were observed by fluorescence microscope， scanning electron microscope and transmission electron microscope. The results showed that after inoculation， infection cushions and appressoria formed at 24 h. The hyphae could penetrate through host epidermis directly， and invade host cells by intercellular space or stomata. Among the above ways， direct penetration into epidermis was the major way. The hyphae may form penetration claw to enter cell， and there were mucilage like structures underneath it. The primary hyphae invaded into plant cells and then formed secondary hyphae， which could grow in the cells or in intercellular space. Two patterns of the ways how hyphae penetrating into the adjacent host cell through the cell wall were observed. One was that the hyphae became slender when it penetrated the cell wall into the adjacent cells， and then resumed normal thickness. The other was that the hyphae expanded and covered the side of cell wall， and then became slender after penetrating the cell wall. Finally the hyphae grew like the original size.
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