Host resistance - Phenotypic expression of resistance

4 important questions on Host resistance - Phenotypic expression of resistance

What is remarkable about the expression of resistance alleles in the context of the 'gene-for-gene' relationship?

- Resistance allele expression is mainly a feature of the allelic series.
- The expression also 'only' acts as a kind of 'switch' for resistance reaction.

What are some genes that confer resistance to Cladosporium fulvum in tomato, and how does their effectiveness vary?

- Some genes like Cf9 are only effective in the adult plant stage.
- The Cf4 gene is not effective at higher (26°C) or lower temperatures (15°C).

How do some resistance genes behave differently in wheat compared to those in tomato?

- In wheat, temperature-dependent expression of resistance genes is common.
- Some resistance genes act early in pathogen development, others later.
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

What factors can modify the phenotypic expression of resistance?

- The genetic background and type of resistance (complete or incomplete).
- The host genotype for the avirulence gene.
- The temperature and tissue type affecting the resistance gene expression.

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo