1
What is the correct sequence of producing different structures by a germinating fungal conidium?
(A) . Penetration peg
(B) . Haustorium
(C) . Germ tube
(D) . Appressorium
Choose the correct answer from the options given below:
EXPLANATION
Infection Process, Survival, Inoculum Dynamic
- Infection Process of Foliar Fungal Pathogens:
- Germ tube (C): Conidium germinates on the host leaf cuticle in the presence of free water to produce a vegetative germ tube.
- Appressorium (D): The germ tube tip swells and forms a melanized, dome-shaped infection structure called an appressorium, generating extreme turgor pressure.
- Penetration peg (A): A slender penetration hypha emerges from the appressorium base, piercing the host cuticle and epidermal cell wall via mechanical force and cell-wall degrading enzymes (cutinases, cellulases).
- Haustorium (B): Within the host mesophyll cell, the invading hypha invaginates the plant plasma membrane to differentiate a specialized nutrient-absorbing haustorium.
- Sequential Order: (C) $\rightarrow$ (D) $\rightarrow$ (A) $\rightarrow$ (B) (Option 2).
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