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A clamp connection is a hook-like structure formed by growing hyphal cells of certain fungi. It is a characteristic feature of basidiomycete fungi. It is created to ensure that each cell, or segment of hypha separated by septa (cross walls), receives a set of differing nuclei, which are obtained through mating of hyphae of differing sexual types.
Mating in fungi is a complex process governed by mating types. Research on fungal mating has focused on several model species with different behaviour. [ 3 ] [ 4 ] Not all fungi reproduce sexually and many that do are isogamous ; thus, for many members of the fungal kingdom, the terms "male" and "female" do not apply.
In certain areas of the temperate northern hemisphere where fungi have been well studied, the ratio of vascular plant to fungal species is about 6 to 1. [2] This suggests that there may be as many as 120,000 species of fungi within the United States, surpassing the 29,000 U.S. species of microfungi estimated based on collection and literature ...
There are basically two distinct types of sexual reproduction among fungi. The first is outcrossing (in heterothallic fungi). In this case, mating occurs between two different haploid individuals to form a diploid zygote, that can then undergo meiosis. The second type is self-fertilization or selfing (in homothallic fungi). In this case, two ...
Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. [6] [7] Sexual reproduction also occurs in some unicellular eukaryotes. [2] [8] Sexual reproduction does not occur in prokaryotes, unicellular organisms without cell nuclei, such as bacteria and archaea.
Reproduction via spores involves the spreading of the spores by water or air. Algae and some fungi often use motile zoospores that can swim to new locations before developing into sessile organisms. Airborne spores are obvious in fungi, for example when they are released from puffballs. Other fungi have more active spore dispersal mechanisms.
They were once considered protozoans or protists, but are now known to be fungi, [8] or a sister group to true fungi. [9] These fungal microbes are obligate eukaryotic parasites that use a unique mechanism to infect host cells. [7] They have recently been discovered in a 2017 Cornell study to infect Coleoptera on a large scale.
Meiosis is an essential part of the life cycle of all sexually reproducing organisms, and in its main features, meiosis in N. crassa seems typical of meiosis generally. As the above events are occurring, the mycelial sheath that had enveloped the ascogonium develops as the wall of the perithecium, becomes impregnated with melanin, and blackens.
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