1
What is true for Clavibacter xyli subsp. xyli?
(A) . Raton stunting disease of sugarcane
(B) . Gram-negative
(C) . Pleomorphic rods
(D) . Cells are motile
Choose the correct answer from the options given below:
EXPLANATION
Bacterial Diseases of Field, Fruit & Vegetabl
- Biology of Clavibacter xyli subsp. xyli (Leifsonia xyli subsp. xyli):
- is true: It is the causal agent of Ratoon Stunting Disease (RSD) of sugarcane, causing severe vascular clogging, red-orange fibrovascular discoloration in nodal regions, and progressive yield decline.
- is false: It is a Gram-positive, high-G+C coryneform actinobacterium, not Gram-negative.
- is true: It appears morphologically as small, slender, pleomorphic coryneform rods (often with clubbed or branched ends).
- is false: The cells are strictly non-motile and lack flagella.
- Conclusion: Features (A) and (C) only are true (Option 3).
Correct option: (3) (A) and (C) only.
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