Question:
Match List-I with List-II:
List-I (Disease) List-II (Indicator Plant) (A) Tristeza (I) Kagzi Lime (B) Exocortis (II) Rangpur Lime (C) Psorosis (III) Sweet Orange var. Pineapple (D) Greening (IV) Sweet Orange var. Valencia
Match List-I with List-II:
| List-I (Disease) | List-II (Indicator Plant) |
|---|---|
| (A) Tristeza | (I) Kagzi Lime |
| (B) Exocortis | (II) Rangpur Lime |
| (C) Psorosis | (III) Sweet Orange var. Pineapple |
| (D) Greening | (IV) Sweet Orange var. Valencia |
Show Hint
'Kagzi lime' is the universal indicator host used to diagnose Citrus Tristeza Virus (CTV) infection. Matching (A) to (I) immediately simplifies finding the correct option.
Updated On: Jul 23, 2026
- (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
- (A) - (IV), (B) - (II), (C) - (III), (D) - (I)
- (A) - (I), (B) - (IV), (C) - (II), (D) - (III)
- (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Citrus crops are vulnerable to several viral, viroid, and bacterial diseases.
In indexation programs, specific sensitive plant species or cultivars (indicator plants) are used to detect and diagnose these graft-transmissible pathogens based on the expression of characteristic symptoms.
Step 2: Detailed Explanation:
Let us match the citrus diseases with their established indicator plants:
- (A) Tristeza $\rightarrow$ Kagzi lime (I): Acid lime (locally 'Kagzi lime', Citrus aurantifolia) is the standard, highly sensitive indicator plant for Citrus Tristeza Virus (CTV).
Infected plants display distinct symptoms of vein clearing, vein corking, and wood pitting.
- (B) Exocortis $\rightarrow$ Rangpur lime (II): Citrus Exocortis Viroid (CEVd) is indexed using sensitive indicators like Rangpur lime (Citrus limonia) or Etrog citron, which display diagnostic bark shelling and stunting.
- (C) Psorosis $\rightarrow$ Sweet orange var. Pineapple (III): Citrus Psorosis Virus is indexed on 'Pineapple' sweet orange, which displays young leaf flecking and oak-leaf patterns.
- (D) Greening $\rightarrow$ Sweet orange var. Valencia (IV): Citrus greening (Huanglongbing, caused by the bacterium Candidatus Liberibacter) can be indexed on 'Valencia' or 'Sweet orange' cultivars, showing typical mottled leaf symptoms under controlled temperatures.
This results in the sequence: (A)-(I), (B)-(II), (C)-(III), (D)-(IV).
This matches Option (A).
Step 3: Final Answer:
The correct matching sequence is (A) - (I), (B) - (II), (C) - (III), (D) - (IV).
Citrus crops are vulnerable to several viral, viroid, and bacterial diseases.
In indexation programs, specific sensitive plant species or cultivars (indicator plants) are used to detect and diagnose these graft-transmissible pathogens based on the expression of characteristic symptoms.
Step 2: Detailed Explanation:
Let us match the citrus diseases with their established indicator plants:
- (A) Tristeza $\rightarrow$ Kagzi lime (I): Acid lime (locally 'Kagzi lime', Citrus aurantifolia) is the standard, highly sensitive indicator plant for Citrus Tristeza Virus (CTV).
Infected plants display distinct symptoms of vein clearing, vein corking, and wood pitting.
- (B) Exocortis $\rightarrow$ Rangpur lime (II): Citrus Exocortis Viroid (CEVd) is indexed using sensitive indicators like Rangpur lime (Citrus limonia) or Etrog citron, which display diagnostic bark shelling and stunting.
- (C) Psorosis $\rightarrow$ Sweet orange var. Pineapple (III): Citrus Psorosis Virus is indexed on 'Pineapple' sweet orange, which displays young leaf flecking and oak-leaf patterns.
- (D) Greening $\rightarrow$ Sweet orange var. Valencia (IV): Citrus greening (Huanglongbing, caused by the bacterium Candidatus Liberibacter) can be indexed on 'Valencia' or 'Sweet orange' cultivars, showing typical mottled leaf symptoms under controlled temperatures.
This results in the sequence: (A)-(I), (B)-(II), (C)-(III), (D)-(IV).
This matches Option (A).
Step 3: Final Answer:
The correct matching sequence is (A) - (I), (B) - (II), (C) - (III), (D) - (IV).
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