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Magnaporthe grisea pathogenicity genes obtained through insertional mutagenesis
J A Sweigard1, A M Carroll, L Farrall
1Central Research and Development Department, E. I. du Pont de Nemours and Co., Inc., Wilmington, DE 19880-0402, USA. Jim.Sweigard@usa.dupont.com
Molecular Plant-Microbe Interactions : MPMI
|May 9, 1998
Summary
Researchers analyzed mutations in the rice blast fungus, Magnaporthe grisea, to understand pathogenicity. They identified seven new Pathogenicity (PTH) genes crucial for the fungus
Area of Science:
- Plant pathology
- Fungal genetics
- Molecular biology
Background:
- Magnaporthe grisea is a significant pathogen causing rice blast disease.
- Understanding pathogenicity genes is crucial for developing control strategies.
Purpose of the Study:
- To identify and characterize genes involved in the pathogenicity of Magnaporthe grisea.
- To perform a mutational analysis of pathogenicity in the rice blast fungus.
Main Methods:
- Screening of 5,538 hygromycin-resistant transformants generated by restriction enzyme-mediated integration (REMI).
- Utilizing a rapid primary infection assay to identify mutants with defects in plant infection.
- Cosegregation analysis of mutations with the hygromycin resistance marker.
Main Results:
- Twenty-seven mutants with reproducible pathogenicity defects were identified.
- Eighteen mutants showed mutations that cosegregated with the resistance marker.
- Seven Pathogenicity (PTH) genes were cloned and found to play a role in pathogenicity on multiple grass species, including rice, barley, and weeping lovegrass.
Conclusions:
- The study successfully identified seven novel PTH genes essential for Magnaporthe grisea pathogenicity.
- The identification of PTH2 in two independent mutants suggests nonrandom DNA insertion during transformation.
- These findings provide a foundation for further research into fungal virulence mechanisms and disease control.