Host resistance - Race specificity

13 important questions on Host resistance - Race specificity

What is noteworthy about hypersensitivity resistance?

- Highly specific to pathogen species.
- Specific to certain genotypes of the pathogen.

What are pathogen genotypes called when resistance is effective?

- When resistance is effective, they are called avirulent.

What are pathogen genotypes called when resistance is not effective?

- When resistance is not effective, they are called virulent.
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How can the degree of resistance be represented?

- Degree of resistance can be plotted graphically against pathogen genotypes.

What is the graphical representation of resistance interactions called?

- Representation of resistance interactions is called vertical resistance.

What can breeders expose plant accessions to?

- Breeders expose plant accessions to a collection of pathogen isolates.

What is an isolate in the context of plant pathology?

- An isolate is a pure sample of a pathogen or parasite.

How can an isolate be maintained?

- An isolate can be maintained purely in vitro or stored, like in liquid nitrogen.

What are plant genotypes inoculated with to find a virulence spectrum?

- Distinct host plant genotypes are inoculated with isolates of the pathogen.
- A virulence spectrum may be found from this process.

What is the term used within a pathogen species or a forma specialis for variation within the same virulence spectrum?

- A "race" refers to variation within the pathogen species or within a forma specialis with the same virulence spectrum.

What is the graph in Figure 12 an example of?

- Figure 12 provides an example of a race with a wide virulence spectrum.

What is an alternate term used for vertical resistance?

- Vertical resistance is also called race-specific resistance.

Are the terms biotypes, strains, pathotypes, and race commonly used interchangeably among researchers?

- Biotypes, strains, pathotypes, and race are often used as synonymous terms by researchers.

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