Question

process of reproduction in Ascomycetes ??​

Answer 1

Answer:

Asexual reproduction. Asexual reproduction is the dominant form of propagation in the Ascomycota, and is responsible for the rapid spread of these fungi into new areas. It occurs through vegetative reproductive spores, the conidia. ... They are typically formed at the ends of specialized hyphae, the conidiophores.

Explanation:

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Answer 2

Members of the phylum Ascomycota are known as ascomycetes. Ascomycota is the largest phylum of the kingdom fungi and has around 64000 species.

They come under the sub-kingdom Dikarya (presence of dikaryon).

They produce sexual non-motile spores known as ascospores. They are produced in a sac-like structure known as an ascus. Each ascus contains 4-8 ascospores. They are commonly known as sac-fungi.

• Asexual reproduction is by the formation of conidia exogenously on conidiophores
• Yeast reproduces asexually by budding
• Sexual reproduction is by conjugation between two gametangia. They are either homothallic or heterothallic

Sexual Reproduction in Ascomycetes:

• Two different mating types hyphae come together and fuse
• Plasmogamy takes place, but it does not follow karyogamy immediately
• The fused structure contains two haploid nuclei from each parent, i.e. dikaryon
• New hyphae are produced with dikaryotic cells
• At the tip of the hyphae, asci develop in the ascocarp
• In each ascus, two nuclei fuse together (karyogamy) to form a diploid zygote

Formation of Ascospores:

• The diploid zygote undergoes meiosis to form 4 haploid nuclei, which undergo mitotic division to form 8 haploid nuclei. Each of the nuclei accumulates cytoplasm and a thick cell wall surrounds it. These are known as ascospores
• Ascospores are released from asci through pore, slit or hinged lid and dispersed by air currents
• Under favourable conditions, ascospores germinate to form new mycelia.

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