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Plant Pathology Lab
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A lab that studies plant diseases caused by fungi and explores ways to prevent them.
AboutAbout the lab
Understanding fungi to protect plants from disease
The Plant Pathology Lab studies plant diseases caused by filamentous fungi, a group of fungi that includes molds.
It investigates the characteristics and genetics of soilborne pathogens such as the fungi causing Verticillium wilt and black root rot, and of airborne pathogens such as those causing cucumber target leaf spot and lettuce brown spot.
In recent years, it has also taken up diseases that have become problems in facilities such as plant factories.
By clarifying the characteristics of pathogens and the mechanisms by which they cause disease, the lab aims to establish techniques for preventing disease.
Key terms
- Filamentous fungi
- A group of fungi that grow by extending thin, thread-like cells, as molds do
- Host range
- The range of plant species that a given pathogen can infect. It differs depending on the species and strain of the pathogen
- DNA marker
- A characteristic DNA sequence that serves as a landmark for a position on a chromosome
ResearchResearch themes
The lab studies the characteristics of plant pathogens and the mechanisms by which they cause disease. Its work ranges from searching for genes that determine pathogenicity to the relationship between environment and disease development and the characteristics of newly emerged diseases, with the aim of finding ways to prevent disease.
*Illustrative imageGenes that determine host range
Pathogens in the genus Verticillium differ in which plants they can infect depending on species and strain. The lab crosses strains with different pathogenicity and examines the genome using DNA markers as landmarks, searching for the genes that determine pathogenicity. It has identified a chromosome thought to determine pathogenicity to tomato and bell pepper.
*Illustrative imageEnvironmental conditions and disease development
Targeting diseases that tend to occur in protected horticulture, such as cucumber downy mildew and cucumber target leaf spot, the lab investigates how conditions such as temperature and humidity affect infection by the pathogen, disease development, and spread to surrounding plants, looking for clues to preventing outbreaks.
*Illustrative imageNewly emerged diseases in Japan
For diseases reported for the first time in Japan, and sometimes for the first time in the world, the lab clarifies the characteristics of the disease and its pathogen and considers how to prevent it. It works on diseases such as leaf spot of calla lily and lettuce black root rot, and has also developed a DNA-based technique for detecting and identifying the black root rot fungus.
MembersFaculty
- Associate ProfessorToshiyuki Usami
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Fruits and Vegetables (20210128-ARS-LSC-0306)” USDAgov / Public domain (cropped)
- Genes that determine host range: “Pepper infected with tomato spotted wilt virus” Carlos Gonzalez / CC BY-SA 3.0 (cropped)
- Environmental conditions and disease development: “Cherry Leaf Spot 2” Glen R. Stanosz, University of Wisconsin-Madison; Mary L. Torsello, USDA Forest Service / Public domain (cropped)
- Newly emerged diseases in Japan: “Melon Necrotic Spot Virus on Older Leaves” BioSciences BA / CC0 (cropped)
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