Question:
Deciduous and extremely freeze hardy true citrus species is
Deciduous and extremely freeze hardy true citrus species is
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Poncirus trifoliata also provides resistance against citrus nematode and Phytophthora, though it performs poorly in alkaline or saline soils.
Updated On: Jul 10, 2026
- Poncirus
- Eremocitrus
- Microcitrus
- Clymenia
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Wild relatives of commercial citrus possess diverse adaptations, including extreme temperature tolerance.
Identifying cold-tolerant genotypes is crucial for selecting rootstocks in sub-temperate regions.
Step 2: Detailed Explanation:
Poncirus trifoliata (Trifoliate orange) is a close relative of Citrus and is the only deciduous genus in this group.
By shedding its leaves in winter and entering deep dormancy, it can survive freezing temperatures down to $-20^{\circ}\text{C}$.
This deciduous habit and physiological dormancy make it an exceptionally cold-hardy citrus rootstock.
Step 3: Final Answer:
The deciduous and freeze-hardy true citrus relative is Poncirus.
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