Question:
Citrus rootstock incompatible with lime and lemon
Citrus rootstock incompatible with lime and lemon
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Trifoliate orange (Poncirus trifoliata) is highly sensitive and incompatible with sweet orange, lemon, and lime scions. It is best suited for mandarins.
Updated On: Jul 23, 2026
- Citrus unshiu
- Rangpur lime
- Karna Khatta
- Trifoliate orange
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
In graft propagation of citrus crops, selecting a compatible rootstock is critical to ensure proper nutrient translocation, tree vigor, and longevity.
Graft incompatibility occurs when the scion and rootstock fail to form a functional vascular union, leading to physiological disorders, anatomical swelling, or tree decline.
Step 2: Detailed Explanation:
Trifoliate orange (Poncirus trifoliata) is a deciduous citrus relative widely used as a dwarfing and cold-hardy rootstock.
- However, it exhibits severe graft incompatibility with most cultivars of acid lime (Citrus aurantifolia) and sweet lemon (Citrus limetta).
- When grafted with lime or lemon (such as 'Eureka' lemon), it often results in bud union abnormalities, phloem necrosis, and quick decline of the tree.
Let us evaluate the other options:
- Citrus unshiu (Satsuma mandarin): It is a scion cultivar, not a major commercial rootstock for limes and lemons.
- Rangpur lime (Citrus limonia): It is highly compatible with limes and lemons, making it a very popular rootstock in India due to its tolerance to drought and tristeza virus.
- Karna Khatta (Citrus karna): It is a widely used commercial rootstock in Northern India, highly compatible with limes and lemons.
Therefore, Trifoliate orange is the incompatible rootstock.
Step 3: Final Answer:
The citrus rootstock incompatible with lime and lemon is Trifoliate orange.
In graft propagation of citrus crops, selecting a compatible rootstock is critical to ensure proper nutrient translocation, tree vigor, and longevity.
Graft incompatibility occurs when the scion and rootstock fail to form a functional vascular union, leading to physiological disorders, anatomical swelling, or tree decline.
Step 2: Detailed Explanation:
Trifoliate orange (Poncirus trifoliata) is a deciduous citrus relative widely used as a dwarfing and cold-hardy rootstock.
- However, it exhibits severe graft incompatibility with most cultivars of acid lime (Citrus aurantifolia) and sweet lemon (Citrus limetta).
- When grafted with lime or lemon (such as 'Eureka' lemon), it often results in bud union abnormalities, phloem necrosis, and quick decline of the tree.
Let us evaluate the other options:
- Citrus unshiu (Satsuma mandarin): It is a scion cultivar, not a major commercial rootstock for limes and lemons.
- Rangpur lime (Citrus limonia): It is highly compatible with limes and lemons, making it a very popular rootstock in India due to its tolerance to drought and tristeza virus.
- Karna Khatta (Citrus karna): It is a widely used commercial rootstock in Northern India, highly compatible with limes and lemons.
Therefore, Trifoliate orange is the incompatible rootstock.
Step 3: Final Answer:
The citrus rootstock incompatible with lime and lemon is Trifoliate orange.
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