🍄 General Characters of Fungi
Major structural, reproductive, and ecological characteristics that define fungi in plant pathology.
Fungi are the most important group of plant pathogens, and understanding their structure and reproduction is essential for diagnosis, epidemiology, and control.
Basic Characteristics
General fungal features:
- Eukaryotic and achlorophyllous.
- Unicellular (yeasts) or multicellular filamentous forms.
- Cell wall usually contains chitin and glucans.
- Heterotrophic nutrition by absorption.
- Reproduce by asexual and/or sexual spores.
Thallus and Hyphal Organization
The fungal body is called thallus.
- Hypha: tubular filament with cell wall and protoplasm.
- Mycelium: network of hyphae.
- Septate hyphae: divided by cross walls.
- Coenocytic hyphae: aseptate, multinucleate.
Thallus forms:
- Eucarpic: vegetative and reproductive parts differentiated.
- Holocarpic: whole thallus converts into reproductive structure.
Fungal Tissues and Modifications
Common structural modifications:
- Plectenchyma (organized hyphal tissue).
- Sclerotia (resting compact masses).
- Rhizomorphs (root-like cords).
- Stromata (supporting tissue for fruiting bodies).
- Haustoria (absorptive structures in host cells).
Reproduction in Fungi
Asexual reproduction:
- Fragmentation, budding, and spore formation (conidia, sporangiospores, zoospores).
Sexual reproduction:
- Plasmogamy, karyogamy, and meiosis.
- Sexual spores include oospores, zygospores, ascospores, and basidiospores.
Importance in Plant Pathology
Fungal pathogens cause leaf spots, blights, rusts, smuts, wilts, rots, and mildews. Their spore biology governs survival, spread, and epidemic development.
Summary Cheat Sheet
| Term | Meaning |
|---|---|
| Thallus | Vegetative body of fungus |
| Hypha | Basic filamentous unit |
| Mycelium | Mass of interwoven hyphae |
| Septate | Hypha with cross walls |
| Coenocytic | Hypha without septa |
| Conidia | Asexual spores |
| Ascospore / Basidiospore | Sexual spores in higher fungi |
References
1 source • [1]
References
[1]
Used for: Core fungal structure and reproduction concepts used in agricultural plant pathology.
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