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  • 1
    Electronic Resource
    Electronic Resource
    Enzymatic studies of the extracellular mucilage of two aquatic hyphomycetes,Lemonniera aquatica andMycocentrospora filiformis (1997)
    Springer
    Mycoscience 38 (1997), S. 105-115 
    Details
    ISSN: 1618-2545
    Keywords: appressorium ; aquatic hyphomycetes ; mucilage composition ; strength of attachment ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of three carbohydrate-digesting enzymes, β-glucuronidase, lyticase and α-mannosidase and three proteolytic enzymes, α-chymotrypsin, papain and pronase E, on the strength of conidial attachment ofLemonniera aquatica andMycoentrospora filiformis was determined using the LH_Fowler cell Adhesion Measurement Module. Carbohydrate-digesting enzyme treatments showed significant differences in number of attached and detached, conidia versus control samples; little or no effect was observed for the proteolytic enzymes. Scanning and transmission electron microscopy showed different degrees of mucilage digestion by the carbohydrate-digesting enzymes on the germ hyphae, hyphae subtending appressoria, and appressoria of the two species. The loss of mucilage integrity and decrease in mucilage thickness were more pronounced on the hyphal sheaths than on the appressorial sheaths. Lyticase caused the most severe damage to the mucilage and cytoplasm of both fungi, particularlyL. aquatica. β-Glucuronidase and α-mannosidase exhibited more effective mucilage digestion onM. filiformis than onL. aquatica. Results indicate that the mucilage of the two species is mainly polysaccharide, containing more β-1,3-glucans than β-glucuronide and α-mannosyl residues. Variability of mucilage composition exists between these species and also between different structures of the same fungus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460844
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural observations of asci, ascospores and appendages ofMassarina armatispora (Ascomycota) (1997)
    Springer
    Mycoscience 38 (1997), S. 141-146 
    Details
    ISSN: 1618-2545
    Keywords: bitunicate ascus ; Loculoascomycetes ; mangrove fungus ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Massarina armatispora (Ascomycota, Dothideales, Lophiostomataceae) is described for the first time at the ultrastructural level. Two new structures were observed for this species. Firstly, the ascospores were shown to possess polar chambers formed from the episporium and which contained a fibrillar material and secondly, a lateral fibrillar appendage-like structure. The similarities between marine ascomycetesMassarina armatispora, Massarina thalassiae andParaliomyces lentiferus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460849
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of germination and mucilage production inHalosphaeria appendiculata (Halosphaeriaceae) (1997)
    Springer
    Mycoscience 38 (1997), S. 45-53 
    Details
    ISSN: 1618-2545
    Keywords: ascspores ; germ tube ; Halosphaeria ; marine fungi ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The germination of ascospores of the marine fungusHalosphaeria appendiculata was investigated with transmission electron microscopy. Prior to germination, settled ascospores became surrounded by a fibro-granular layer. Small, membrane-bounded vesicles and larger electron-dense membrane-bounded vesicles aggregated at the site of germ tube formation where the plasmalemma adjacent to the aggregation was convoluted. The vesicles appeared to fuse with the plasmalemma, releasing their contents. Enzymatic digestion of the spore wall probably occurred at the time of germ tube emergence. After the nucleus had migrated into the newly formed germ tube, a septum was formed to delimit the germ tube from the ascospore. The growing germ tube can be divided into 3 morphological regions, namely the apical, sub-apical and vacuolated regions, and is typical of other fungi. A mucilaginous sheath was associated with the older mycelium. The germ tube displaced the polar appendage, and the ascospore, germ tube and appendage were enclosed in a mucilaginous sheath. In ascospores which subtended old germ tubes, the nucleus and lipid body became irregular in shape and the cytoplasm was more vacuolated. Microbody-like structures remained associated with the lipid throughout development, and were present in old ascospores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464968
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    Paper (German National Licenses)
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