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A sporangium (from Late Latin, from Ancient Greek σπορά (sporá) 'seed' and ἀγγεῖον (angeîon) 'vessel'); pl.: sporangia) [1] is an enclosure in which spores are formed. [2] It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other groups form sporangia at some point in their life cycle.
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.
Mucor spores or sporangiospores can be simple or branched and form apical, globular sporangia that are supported and elevated by a column-shaped columella. Mucor species can be differentiated from molds of the genera Absidia , Rhizomucor , and Rhizopus by the shape and insertion of the columella, and the lack of stolons and rhizoids .
A walled spore produced within a sporangium. [358] sporangium. pl. sporangia. A sac-like structure that produces spores endogenously. From Gr. angeion, vessel. [359] spore A reproductive structure in fungi. Can result from both sexual and asexual processes. [360] spore wall The layered wall defining a spore. Considered to have five layers.
Spores develop on sides and edges of wall; Spores: The spores are round or oval globules individually attached to stalks sprouting from sporangia. Spores vary in size (8-13 μm in diameter). The spore walls are thin and transparent. Spores appear grainy and may have some vacuoles which are often near the perimeter or surrounding the nucleus.
The resulting spores are protected through the formation of a thick cell wall and can withstand harsh conditions such as drought or extreme temperatures. Examples are chlamydospores, teliospores, zygospores, and myxospores. Similar survival structures produced in some bacteria are known as endospores.
The fungus produces a thick walled structure known as a winter sporangium. It is 25-75 μm in diameter and contains 200-300 spores. Sporangia are clustered into thin-walled sori. The motile life stage, zoospore is about 0,5 μm in diameter and has one posterior flagellum.
Several cell wall modifications, as well as incorporation of sporopollenin (responsible for the dark colour of spores) take place resulting in a mature zygospore. Trisporic acid, as the endpoint of this recognition pathway, can solely be produced in presence of both compatible partners, which enzymatically produce trisporoid precursors to be ...