Cucullosporella mangrovei, ultrastructure of ascospores and their appendages |
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Authors: | Siti Aisyah Alias Stephen T Moss Evan B Gareth Jones |
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Institution: | (1) School of Biological Sciences, University of Portsmouth, King Henry Building, King Henry 1 Street, PO1 2DY Portsmouth, U.K.;(2) BIOTEC, National Centre for Genetic Engineering and Biotechnology, Yothi Building, 73/1 Rama 6 Road, Rajdhevee, 10400 Bangkok, Thailand;(3) Present address: Institute of Biological Sciences, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia |
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Abstract: | The ultrastructure ofCucullosporella mangrovei ascospores is described. Mature ascospores possess two wall layers, an outer electron-dense episporium and an innermost tripartite
mesosporium. Episporial elaborations form electrondense spore wall ornamentations from which extend fibrils that may constitute
a highly hydrated exosporium which was not visualised at either the scanning electron microscope or light microscope level.
Ascospores possess a hamate appendage at each pole which unfolds in seawater to form a long thread. Ultrastructurally the
polar appendage comprises folded fibro-granular electron-dense material and fine fibrils. The fibrils form a matrix around
and within the fibro-granular appendage and around the entire unreleased ascospore. These fibrils have not been observed associated
with the ascospore appendages in other species of the Halosphaeriales and are a discrete and new appendage component. The
fibro-granular appendage and fibrils are bounded by the outer delimiting membrane which is absent around released ascospores.
The nature of the spore appendage is compared with that of other marine and freshwater ascomycetes and the taxonomic assignment
of the species is discussed. |
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Keywords: | Halosphaeriales marine fungi ultrastructure |
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