Natural defence against pathogens and parasites - Tolerance
7 important questions on Natural defence against pathogens and parasites - Tolerance
What does tolerance in a host plant refer to in the context of pathogen infection?
- Does not require restriction of pathogen contact or reproduction.
- A tolerant plant shows less damage or milder symptoms than a sensitive plant.
How are tolerance and sensitivity assessed in plants?
- Determined by damage per unit of pathogen quantity.
- Lower ratio of damage to pathogen quantity indicates higher tolerance.
In virology, how is the term tolerance used differently and what is an extreme example?
- In extreme cases, a host does not show symptoms and is called a symptomless carrier.
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What is the effect of the Ty1 gene on plants infected with TYLCV?
- Ty1 gene lines show mild symptoms or are symptomless.
- Moneymaker plant with Ty1 gene showed clearly yellow and curling leaves.
- Ty1 allows similar amounts of TYLCV DNA accumulation as ABL.
How was the tolerance to Tomato yellow leaf curl virus (TYLCV) in wild tomato species transferred to cultivated tomatoes?
- ABL line carrying the Ty1 gene was created by advanced backcrossing.
- Both ABL and Moneymaker plants accumulated similar TYLCV DNA levels.
After inoculation with a virus, what might mild symptoms in plants indicate?
- The determination of plant resistance or tolerance depends on the virus concentration in the plant.
- If high virus concentration without severe symptoms, plants might be tolerant.
What was the outcome of Kooistra's 1968 test on cucumber lines for resistance to the cucumber green mottle mosaic?
- Symptomless cucumber lines showed no significant yield reduction.
- Lines with high virus concentration but no symptoms were neither resistant nor tolerant.
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