Host resistance - Durability
11 important questions on Host resistance - Durability
What is considered a very important aspect in resistance breeding according to the introduction?
- Ability to decrease in the course of time.
What phenomenon occurs when resistance genes for which the pathogen has evolved virulence by losing the corresponding Avr effector are called?
- Resistance genes are called defeated R genes.
In the Dutch lists of recommended cultivars, how is the resistance score of cultivars often evident over several years?
- Initially rated as 9 or 10, eventually decline.
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What do McDonald and Linde argue regarding the evolutionary potential of a pathogen population to overcome genetic resistance in their host plant species?
- Pathogens can eventually break down resistance genes.
Which plant pathogens have been identified to fulfill the conditions that favor pathogen evolution according to McDonald and Linde?
- Plant pathogens with sexual and asexual reproduction.
Which pathogens tend to exclusively reproduce asexually and are soil-borne, as mentioned in the text?
- Meloidogyne incognita is a nematode.
- This group tends to be durably effective.
What is the definition of durability in plant resistance according to the text?
- It must remain on a large scale.
What does Table 9.9 indicate about the resistance of different cultivars to three pathogens between 1965-1979?
- Ratings are from 10 (completely resistant) to 1 (extremely susceptible).
- Arrows indicate where resistance broke down.
How is the durability of resistance judged according to the text?
- Depends on effectiveness over time and area cultivated.
What information does the highlighted text about Flexigas flax reveal regarding pest resistance?
- It illustrates importance of acreage in durability definition.
What case study in the text exemplifies the breakdown of resistance over time?
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