Aspergillus niger is a mold classified within the Nigri section of the Aspergillus genus. The Aspergillus genus consists of common molds found throughout the environment within soil and water, on vegetation, in fecal matter, on decomposing matter, and suspended in the air. Species within this genus often grow quickly and can sporulate within a few days of germination. A combination of characteristics unique to A. niger makes the microbe invaluable to the production of many acids, proteins and bioactive compounds. Characteristics including extensive metabolic diversity, high production yield, secretion capability, and the ability to conduct post-translational modifications are responsible for A. niger's robust production of secondary metabolites. A. niger's capability to withstand extremely acidic conditions makes it especially important to the industrial production of citric acid.
Image: Aspergillus niger 01
Image: Aspergillus niger SEM
A. niger growing on potato dextrose agar
A. niger growing on onion
Aspergillus is a genus consisting of several hundred mold species found in various climates worldwide.
Aspergillus
Aspergillus on a tomato in detail
Various Penicillium, Aspergillus spp. and other fungi growing in axenic culture
Historical model of Aspergillus, Botanical Museum Greifswald