Natural defence against pathogens and parasites - Avoidance
10 important questions on Natural defence against pathogens and parasites - Avoidance
What reduces the chance of contact between host or food plant and a potential attacker, usually as a result of a particular morphology, phenology or odor?
- Examples include mimicry, camouflage, and chemicals that deter attackers.
What are some of the physical avoidance mechanisms mentioned?
- Structures that deter physical contact with attackers.
How does synchrony with a parasite's life cycle play a role in avoidance?
- Avoidance is effective if timing does not match the parasite's life cycle.
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What is an example of mimicry in avoidance, and which species does it involve?
- They mimic the leaves of inedible Heliconius larvae host plants.
What chemical mechanism is deployed by plants to discourage oviposition?
- These prevent further egg-laying by indicating the site is 'occupied'.
What term is used for plants releasing chemicals that deter attackers without any physical contact?
- It implies passive acceptance of repellents by attackers.
How does the physical structure of a plant affect the micro-climate and deter fungal infestations?
- Horizontal leaves or crop architecture may deter fungi.
What effect can plants' growth habits have on the spread of disease?
- Changing the micro-climate to deter pathogens.
What affects the pathogen's ability to detect stomates on plant leaves?
- This detection difficulty is due to avoidance mechanisms acting before contact between pathogen and plant.
What is the difference between avoidance and escape in plant pathology?
- Avoidance is linked to properties of the plant, while escape is due to environmental conditions or inoculum densities.
- Breeders should minimize the chance of escape to avoid selecting plants that appear resistant but are not.
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