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#Ascomycota

2 public questions tagged with this topic.

Fungi Classification

Ascomycota produce sexual spores called

Ascomycota produce sexual meiospores termed ascospores typically eight per ascus following meiosis plus one mitotic division inside sac. Ascospores form endogenously within sac-like ascus often arranged linearly or irregularly, wall contains melanin and hydrophobins resisting desiccation and UV. Upon maturation asci rupture or forcibly shoot spores via turgor pressure mechanism. Basidiospores exogenous on basidia externally, zygospores thick-walled diploid resting spores in mucorales, conidia asexual mitospores. Ascospore morphology - shape, septation, ornamentation - aids generic identification. Presence inside asci defines Ascomycota encompassing morels, truffles, yeasts, dermatophytes, many plant pathogens like powdery mildews.

Ref: Campbell Biology 12th ed., Chapter 31: Ascomycota Ascospores Inside Asci; NCERT Class 11 Ascomycetes Ascospores; NCBI Ascomycete Reproduction

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Fungi Classification

Dikarya includes which two major fungal phyla?

Dikarya subkingdom unites two largest fungal phyla Ascomycota and Basidiomycota sharing derived character: formation of dikaryotic mycelium where cells contain paired haploid nuclei from different parents maintained via clamp connections or croziers, eventual karyogamy and meiosis inside ascus or basidium for spore production. Zygomycota and Chytridiomycota lack regular dikaryon with immediate nuclear fusion. Molecular phylogeny supports Dikarya monophyly comprising approximately 98% described fungi, includes yeasts, molds, mushrooms, lichens. Recognition clarifies evolution of complex fruiting bodies and advanced genetic regulation via mating-type loci distinguishing them from early diverging lineages.

Ref: Campbell Biology 12th ed., Chapter 31: Dikarya Ascomycota Basidiomycota Clade; NCBI Fungal Phylogeny - Hibbett et al. 2007 Dikarya Monophyly; James et al.

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