FIGURE 2-3. A rice plant (left) and Arabidopsis thaliana (right), a model plant for host-pathogen interactions.

FIGURE 2-3A rice plant (left) and Arabidopsis thaliana (right), a model plant for host-pathogen interactions

The establishment of numerous pathosystems in the genetically tractable plant species A. thaliana leads to rapid identification of components of host resistance and defense signaling pathways. Within each group, related bacterial, fungal, viral, and nematode pathogens cause diseases in both rice and Arabidopsis. Scanning electron micrographs (center panels) and disease reaction phenotypes of representative phytopathogens of Oryza and Arabidopsis are shown. The rice bacterial pathogen X. oryzae pv. oryzae causes chlorotic water-soaked stripes on rice leaves and lesions on Arabidopsis leaves. The bacterial pathogen P. syringae induces small water-soaked chlorotic lesions on Arabidopsis. The fungus Erysiphe cihoracearum causes powdery mildew disease on Arabidopsis. The most important fungal pathogen of rice is Magnoportha grisea, which produces gray necrotic lesions on all parts of the shoot. Tobacco mosaic virus infects and spreads throughout the Arabidopsis plant with few detectable symptoms. The spherical form of rice tungro virus causes yellow discoloration of the leaves. The plant parasitic nematode infects and causes disease in both rice and Arabidopsis.

SOURCE: Baker et al. (1997).

From: 2, Beyond the Gut: Insights from Other Host-Microbe Systems

Cover of Ending the War Metaphor
Ending the War Metaphor: The Changing Agenda for Unraveling the Host-Microbe Relationship: Workshop Summary.
Institute of Medicine (US) Forum on Microbial Threats.
Washington (DC): National Academies Press (US); 2006.
Copyright © 2006, National Academy of Sciences.

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