Related Experiment Video
Updated: May 9, 2026
The Plant Infection Test: Spray and Wound-Mediated Inoculation with the Plant Pathogen Magnaporthe Grisea
Published on: August 4, 2018
Penetration and post-penetration resistance to Magnaporthe oryzae in Arabidopsis
Chiharu Okawa1, Misato Nakao, Atsushi Ishikawa
1Department of Bioscience, Fukui Prefectural University.
Abstract:
The rate of entry of Magnaporthe oryzae into the Arabidopsis pen2 quintuple (pen2 NahG pmr5 agb1 mlo2) mutant was significantly higher than those into the pen2 quadruple (pen2 NahG pmr5 agb1 and pen2 NahG pmr5 mlo2) mutants. The lengths of the infection hyphae in the pen2 quintuple mutant were intermediate between the pen2 quadruple mutants. These results suggest that different genetic networks, consisting of PEN2, PMR5, AGB1, and MLO2, control penetration and post-penetration resistance to M. oryzae in Arabidopsis.
Insights
The Magnaporthe oryzae fungus entered Arabidopsis plants with five mutated genes faster than those with four. This suggests PEN2, PMR5, AGB1, and MLO2 genes control plant defense against fungal pathogens.
Area of Science:
- Plant Pathology
- Molecular Genetics
- Arabidopsis Research
Background:
- Magnaporthe oryzae is a major fungal pathogen affecting plants.
- Arabidopsis thaliana serves as a model organism for studying plant-pathogen interactions.
- Plant resistance involves complex genetic networks controlling different defense stages.
Purpose of the Study:
- To investigate the roles of PEN2, PMR5, AGB1, and MLO2 genes in Arabidopsis resistance to M. oryzae.
- To differentiate the functions of these genes in penetration and post-penetration stages of infection.
Main Methods:
- Comparative analysis of M. oryzae entry rates in Arabidopsis mutants.
- Measurement of infection hyphae length in different mutant lines.
- Genetic analysis of quintuple and quadruple mutants.
Main Results:
- Significantly higher M. oryzae entry rate observed in the pen2 quintuple mutant compared to quadruple mutants.
- Intermediate infection hyphae lengths in the quintuple mutant relative to quadruple mutants.
- Differential contributions of PEN2, PMR5, AGB1, and MLO2 to plant defense.
Conclusions:
- The genetic network involving PEN2, PMR5, AGB1, and MLO2 plays a crucial role in Arabidopsis defense against M. oryzae.
- These genes differentially regulate penetration and post-penetration resistance.
- Understanding these networks can inform strategies for disease resistance in crops.
More Related Videos
07:36Visualizing Early Infection Sites of Rice Blast Disease (Magnaporthe oryzae) on Barley (Hordeum vulgare) Using a Basic Microscope and a Smartphone
Published on: March 17, 2023
05:03Direct Observation and Automated Measurement of Stomatal Responses to Pseudomonas syringae pv. tomato DC3000 in Arabidopsis thaliana
Published on: February 9, 2024