Related Experiment Videos
Trafficking arms: oomycete effectors enter host plant cells
Paul R J Birch1, Anne P Rehmany, Leighton Pritchard
1Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK. pbirch@scri.sari.ac.uk
Trends in Microbiology
|December 17, 2005
Summary
Oomycetes cause major plant diseases, but their pathogenicity mechanisms are unclear. Research reveals effector genes and an RXLR motif, suggesting conserved host-targeting strategies in this plant pathogen.
Area of Science:
- Plant Pathology
- Molecular Biology
- Evolutionary Biology
Background:
- Oomycetes are significant plant pathogens responsible for global crop losses.
- The molecular mechanisms underlying oomycete pathogenicity remain largely unknown.
- Recent discoveries include oomycete effector genes with cultivar-specific avirulence (AVR) functions.
Purpose of the Study:
- To investigate the molecular basis of oomycete pathogenicity.
- To explore the evolutionary dynamics of oomycete effector genes and plant resistance genes.
- To understand the cellular localization and potential function of oomycete effector proteins.
Main Methods:
- Identification of oomycete effector genes.
- Analysis of selection pressures on effector and resistance genes.
- Subcellular localization studies of AVR proteins in plant hosts.
Main Results:
- Evidence of diversifying selection in oomycete AVR genes and plant resistance genes, indicating an evolutionary "arms race".
- AVR proteins from Hyaloperonospora parasitica and Phytophthora infestans are found within the plant host cytoplasm.
- The conserved RXLR motif in AVR proteins suggests a conserved mechanism for targeting host cells.
Conclusions:
- Oomycetes likely deliver effector proteins into plant host cells to manipulate host processes.
- The RXLR motif may function as a conserved host-cell-targeting signal.
- Understanding these molecular interactions is crucial for developing strategies to combat oomycete-driven plant diseases.