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How do fungal spores enter plant tissues?
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fungus
A pair of panther cap mushrooms (Amanita pantherina). Closely related to the death cap mushroom (Amanita phalloides), the panther cap is highly poisonous.
Pathogenic fungi typically infect plants when their spores land on the surface of a susceptible host and germinate, producing a germ tube. This tube grows across the plant surface until it locates an entry point.1
Fungi enter plant tissues through several methods:
- Natural Openings: Many fungi enter through microscopic structures such as stomata (air pores in leaves) or lenticels (openings in stems).1
- Wounds: Fungi can penetrate through broken plant hairs, hair sockets in fruit, or other physical wounds in the plant tissue.1
- Direct Penetration: Some fungi produce specialized pressing organs called appressoria. These structures exert pressure using a microscopic, needlelike peg to puncture the plant epidermis.1
Once inside, the fungus branches between the host cells and forms a mycelium network to obtain nourishment. Some species further specialize by producing haustoria, which are absorptive structures that penetrate the host cells themselves.1