Fungi
Fungi are a kingdom of eukaryotic organisms that include yeasts, moulds, and mushrooms, distinguished by their cell walls made of chitin and their heterotrophic mode of nutrition via absorption. They play a critical role in ecosystems as decomposers, breaking down organic matter and recycling nutrients. Fungi also have enormous practical importance, contributing to antibiotic production (penicillin from Penicillium), food fermentation, and the pharmaceutical industry.
Major Groups of Fungi and Their Characteristics
| Division | Common Name | Reproduction | Example |
|---|---|---|---|
| Ascomycota | Sac fungi | Ascospores in asci | Aspergillus, Penicillium |
| Basidiomycota | Club fungi | Basidiospores on basidia | Agaricus (mushroom) |
| Zygomycota | Bread moulds | Zygospores | Rhizopus stolonifer |
| Chytridiomycota | Chytrids | Flagellated spores | Batrachochytrium dendrobatidis |
| Microsporidia | Microsporidians | Polar tube injection | Nosema apis |
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Related Terms
Bacteria
Bacteria are single-celled prokaryotic microorganisms that lack a membrane-bound nucleus and reproduce primarily by binary fission. They are among the most abundant life forms on Earth, inhabiting nearly every environment including soil, water, and the human body. Bacteria play essential roles in nutrient cycling, decomposition, and digestion, and certain species cause infectious diseases while others are harnessed in biotechnology and food production.
Antibiotic
An antibiotic is a chemical substance, originally derived from microorganisms such as fungi or bacteria, that inhibits the growth of or kills bacteria by targeting bacterial-specific structures such as cell walls, ribosomes, or DNA replication machinery. Antibiotics have been among the most important medical discoveries of the 20th century, dramatically reducing mortality from bacterial infections. However, their overuse and misuse have accelerated the emergence of antibiotic-resistant strains, posing a major global health challenge.
Biofilm
A biofilm is a structured community of microorganisms — predominantly bacteria — that are attached to a surface and enclosed within a self-produced extracellular matrix of polysaccharides, proteins, and nucleic acids. Bacteria within biofilms exhibit markedly different gene expression from their planktonic (free-floating) counterparts and can be up to 1000 times more resistant to antibiotics and immune responses. Biofilms are clinically significant as causes of chronic infections (e.g., on medical implants and catheters) and are also exploited beneficially in wastewater treatment and bioremediation.
From Latin "fungus" meaning "mushroom" or "sponge", possibly borrowed from Greek "spongos" (σπόγγος). The kingdom Fungi was formally separated from plants in the 20th century; mycology (the study of fungi) derives from Greek "mykes" (μύκης) meaning "mushroom".