Host resistance - The gene for gene releationship
15 important questions on Host resistance - The gene for gene releationship
What is the resistance of the most plant effective against?
- The effectiveness depends on genes in both the plant and pathogen.
What is the gene-for-gene model?
- Emphasis on a gene for virulence in the pathogen and corresponding resistance in the host.
What is the concept behind the gene-for-gene hypothesis proposed by Flor?
- Flor emphasized the interaction is specific to virulence genes.
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What does the gene-for-gene model assume about hypersensitive resistance?
- Resistance is specific to certain virulence genes.
What do R1 and R2 represent in the gene-for-gene hypothesis?
- These are specific for the corresponding avirulence genes.
How do R1 and R2 function according to the gene-for-gene hypothesis?
- Resistance is effective only with matching avirulence genes.
What are the key concepts discussed in relation to plant-pathogen interactions?
- Resistance and susceptibility are terms used to describe plant reactions.
- Avirulence genes in pathogens are countered by plant proteins.
- Pathogens may produce necrotrophic toxins to promote pathogenesis.
What is accumulating in regard to the molecular basis of the gene-for-gene relationship?
- Dominant alleles for avirulence lead to a specific recognition.
- This recognition triggers the hypersensitive response.
Where does recognition likely take place in the gene-for-gene relationship?
- It is based on whether a pathogen carries a functional avirulence gene.
What happens if the pathogen carries a mutated avirulence gene?
- No hypersensitivity response is elicited.
- The plant can be infected successfully by the pathogen.
What is avirulence gene specificity based on?
- It is determined by the N-terminal and C-terminal domains.
What does the gene-for-gene hypothesis commonly assert?
- This assertion assumes a gene for avirulence corresponding to the resistance gene.
Why might a resistance gene not be race-specific according to the text?
- Not race-specific when avirulence gene is not linked to a particular pathogen race.
What does the gene-for-gene relationship imply?
- It involves ranked resistance levels and isolates' reaction amount.
What is the importance of reaction types in the gene-for-gene relationship?
- These genes are important for differential interaction.
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