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A zygospore is a diploid reproductive stage in the life cycle of many fungi and protists.Zygospores are created by the nuclear fusion of haploid cells. In fungi, zygospores are formed in zygosporangia after the fusion of specialized budding structures, from mycelia of the same (in homothallic fungi) or different mating types (in heterothallic fungi), and may be chlamydospores. [1]
An immature zygosporangium of the Rhizopus fungus forming from two fused gametangia, showing a "yoke" shape.. The name Zygomycota refers to the zygosporangia characteristically formed by the members of this clade, in which resistant spherical spores are formed during sexual reproduction.
The central cell, called the zygosporangium, is destined to become a spore. The zygosporangium is a unique structure to the Zygomycota and is easily recognizable in microscopy due to its characteristic dark color and spiky shape. The nuclei join in a process called karyogamy to form a zygote, which grows into a mature diploid zygomycete. A ...
The haploid nuclei within the zygosporangium then fuse into diploid nuclei. [5] When conditions improve, the zygosporangium germinates, undergoes meiosis and produces a sporangium, which releases spores.
The sporangiospores are asexual mitospores (formed via mitosis), produced inside sporangia (thousands of spores) or sporangioles (single or few spores).They are released when mature by the disintegration of the sporangium wall, or as a whole sporangiole that separates from the sporangiophore.
At the point where two complementary gametangia fuse, a thick-walled, spherical zygosporangium develops. The zygosporangium typically contains a single zygospore. Nuclear karyogamy and meiosis (sexual recombination) occur within it.
Produced by zygosporangium: Zygomycetes: Zygospores on Rhizopus: Ascospores: Produced by ascus: Ascomycetes: Ascospores of Didymella Rabiei: Basidiospores: Produced by basidium: Basidiomycetes: Typical reproductive structure of a basidiomycete, including the basidiospore and basidium: Aecispores: Produced by aecium: Rusts and Smuts Aecia on ...
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