Correct option is B
Explanation-
A. HC-toxin → (iii) Inhibits Histone Deacetylases
HC-toxin is a host-selective toxin produced by Cochliobolus carbonum. It acts as a histone deacetylase inhibitor, modifying gene expression to aid infection.
B. Fusicoccin → (iv) Activates H⁺-ATPase
Fusicoccin is a toxin from Fusicoccum amygdali. It activates plasma membrane H⁺-ATPase, leading to stomatal opening, promoting pathogen entry.
C. GA₃ (Gibberellic acid) → (ii) Accelerates growth
GA₃ is a plant hormone, often hijacked or mimicked by pathogens. It promotes cell elongation and growth, which can be manipulated during infection.
D. TAL (Transcription Activator-Like) effectors → (i) Activates specific host gene expression
TAL effectors (from Xanthomonas species) bind to host DNA and activate specific host genes. These genes may promote susceptibility or nutrient release.
Final Answer:
A - iii, B - iv, C - ii, D - i (Option b)
