A great diversity in mechanisms of resistance - Non-host resistance - formae speciales

8 important questions on A great diversity in mechanisms of resistance - Non-host resistance - formae speciales

What are formae speciales and how do they relate to pathogen strains?

- Formae speciales are strains from the same pathogen species with different host ranges.
- They are also known as forma specialis in singular form.

What superficially appear to be generalists but may consist of different specialist strains?

- Species that seem to be generalists can include different specialist strains.
- An example is the powdery mildew fungus Blumeria graminis.

How does Blumeria graminis behave with different host species?

- Blumeria graminis is pathogenic to a large number of grass and cereal species.
- It shows host-specific pathogenicity, affecting wheat but not barley or oats.
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What term is synonymous with f.sp. used by bacteriologists?

- Bacteriologists use the term pathovar as a synonym for f.sp.

Can formae speciales be distinguished morphologically from each other?

- Formae speciales can rarely be distinguished morphologically from each other.

What does the inability to cross formae speciales indicate?

- The inability to cross formae speciales indicates genetic isolation and possible distinct biological species.

Do most fungal pathogen species consist of formae speciales?

- Most fungal pathogen species do not consist of formae speciales.

Is the term formae speciales used for oomycetes?

- The term formae speciales is not used for oomycetes.

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