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An ascus (from Ancient Greek ἀσκός (askós) 'skin bag, wineskin'; pl.: asci) [1] is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division.
There are 2000 identified genera and 30,000 species of Ascomycota. The unifying characteristic among these diverse groups is the presence of a reproductive structure known as the ascus, though in some cases it has a reduced role in the life cycle. Many ascomycetes are of commercial importance.
Additionally, there are tan and grey mutant strains of S. fimicola. [5] S. fimicola grows best in carbon rich substrates, but it also needs access to nitrogen. Research has shown that S. fimicola grows best with a carbon:nitrogen ratio between 5:1 and 10:1, as S. fimicola grown under these conditions produces markedly more perithecium than in ...
The genome is about 43 megabases long and includes approximately 10,000 genes. There is a project underway to produce strains containing knockout mutants of every N. crassa gene. [5] In its natural environment, N. crassa lives mainly in tropical and sub-tropical regions. [6] It can be found growing on dead plant matter after fires.
An ascocarp, or ascoma (pl.: ascomata), is the fruiting body of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded asci, each of which typically contains four to eight ascospores.
Quizlet is a multi-national American company that provides tools for studying and learning. [1] Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [ 2 ] and released to the public in January 2007. [ 3 ]
Light micrograph of a moss's leaf cells at 400X magnification. The following outline is provided as an overview of and topical guide to cell biology: . Cell biology – A branch of biology that includes study of cells regarding their physiological properties, structure, and function; the organelles they contain; interactions with their environment; and their life cycle, division, and death.
Instead, it forms an endocytobiotic association with Nostoc cyanobacteria. [5] The majority of evidence shows that the Glomeromycota are dependent on land plants ( Nostoc in the case of Geosiphon ) for carbon and energy, but there is recent circumstantial evidence that some species may be able to lead an independent existence. [ 6 ]