Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Prosser High School Senior Demonstrates That Rhizoctonia Oryzae Is a Novel Pathogen of Pea Following Koch's Postulates

Author
item Grunwald, Niklaus

Submitted to: American Phytopathological Society Press On Line Lessons
Publication Type: Popular Publication
Publication Acceptance Date: July 1, 2003
Publication Date: August 1, 2003
Citation: GRUNWALD, N.J. PROSSER HIGH SCHOOL SENIOR DEMONSTRATES THAT RHIZOCTONIA ORYZAE IS A NOVEL PATHOGEN OF PEA FOLLOWING KOCH'S POSTULATES. AMERICAN PHYTOPATHOLOGICAL SOCIETY PRESS ON LINE LESSONS. 2003.

Technical Abstract: Sarah Fiedler, senior in the Prosser High School, Prosser, WA recently presented results from her Advanced Science Practicum. She conducted her own original research project with the objective of demonstrating that a fungal pathogen, with the scientific name Rhizoctonia oryzae, is the pathogen causing a new disease on pea. To demonstrate this, Sarah had to follow a series of steps of what are called Koch's postulates. These same steps are used to prove the pathogenicity of organisms isolated from diseased humans and animals. To complete the postulates, Sarah had to infect healthy plants with the pathogen, observe the same symptoms observed previously, and isolate the pathogen from the inoculated plants to prove that the same fungus used in the inoculations was recovered. In addition, Sarah also demonstrated that these isolates were genetically variable using a molecular technique known as Amplified Fragment Length Polymorphism (AFLP). Sarah worked with Dr. Niklaus Grunwald with the USDA Agricultural Research Service, Prosser, Washington. There is a simple and safe exercise in the K-12 lab section using a fungal disease of stone fruits to demonstrate Koch's postulates: http://www.apsnet.org/education/K-12PlantPathways/TeachersGuide/Activities/BrownRot/Top.htm

Last Modified: 10/20/2014
Footer Content Back to Top of Page