Mycobiology.
2008 Dec;36(4):236-241. 10.4489/MYCO.2008.36.4.236.
Ultrastructures of Colletotrichum orbiculare in the Leaves of Cucumber Plants Expressing Induced Systemic Resistance Mediated by Glomus intraradices BEG110
- Affiliations
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- 1Faculty of Bioscience and Industry, College of Applied Life Sciences, the Research Institute for Subtropical Agriculture and Biotechnology, Cheju National University, Jeju 690-756, Korea. ycjeun@cheju.ac.kr
- 2National Institute of Agricultural Science and Technology, Rural Development Administration (RDA), Suwon 441-707, Korea.
- 3National Instrumentation, Center for Environmental Management, Seoul National University, Seoul 151-921, Korea.
- 4Pohang University of Science and Technology, San 31, Hyoja-dong, Nam gu, Pohang 790-784, Korea.
- 5Gyeonggi Province Agricultural Research and Extension Services, Hwaseong 445-972, Korea.
- KMID: 1487352
- DOI: http://doi.org/10.4489/MYCO.2008.36.4.236
Abstract
- The colonization of an arbuscular mycorrhizal fungus Glomus intraradices BEG110 in the soil caused a decrease in disease severity in cucumber plants after fungal inoculation with Colletotrichum orbiculare. In order to illustrate the resistance mechanism mediated by G. intraradices BEG110, infection patterns caused by C. orbiculare in the leaves of cucumber plants and the host cellular responses were characterized. These properties were characterized using transmission electron microscopy on the leaves of cucumber plants grown in soil colonized with G. intraradices BEG110. In the untreated plants, inter- and intra-cellular fungal hyphae were observed throughout the leaf tissues during both the biotrophic and necrotrophic phases of infection. The cytoplasm of fungal hyphae appeared intact during the biotrophic phase, suggesting no defense response against the fungus. However, several typical resistance responses were observed in the plants when treated with G. intraradices BEG110 including the formation of sheaths around the intracellular hyphae or a thickening of host cell walls. These observations suggest that the resistance mediated by G. intraradices BEG110 most often occurs in the symplast of the host cells rather than in the apoplast. In addition, this resistance is similar to those mediated by biotic inducers such as plant growth promoting rhizobacteria.
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