Spore attachment and extracellular mucilage of aquatic hyphomycetes
作者:
D W T Au,
E B G Jones,
S T Moss,
期刊:
Biofouling
(Taylor Available online 1996)
卷期:
Volume 10,
issue 1-3
页码: 123-140
ISSN:0892-7014
年代: 1996
DOI:10.1080/08927019609386275
出版商: Taylor & Francis Group
关键词: Spore attachment;fungi;freshwater;lectin‐gold cytochemical labelling of adhesive
数据来源: Taylor
摘要:
Stages in conidiun attachment to surfaces ofLemmoniera aquaticaandMycocentrospora filiformis(freshwater Hyphomycetes) were studied at the light microscope and scanning and transmission electron microscope levels. Sigmoid conidia ofM. filiformisattach by pre‐existing conidial mucilage at the spore pole and at a point along the conidial body. Tetraradiate conidia of L.aquaticaattach by the thigmotropic release of mucilage at the tips of the three “arms”;. Germination in both species is followed by the production of germ tubes, germ hyphae and appressoria. The chemical composition of the mucilage involved in attachment was determined by enzymatic studies and lectin‐gold cytochemical studies. The major component was found to be acidic poly‐saccharide, comprising mainly ß‐1, 3‐glucan, N‐acetyl‐D‐glucosamine and N‐acetyl‐neuraminic acid. Variation in mucilage composition exists between the two species, among different structures of the same species, and on different regions of the same structure. This indicates that mucilage producton in the two species is a dynamic process.The ability to secure rapid spore attachment, often in turbulent condition, would be a competitive advantage to these saprobic fungi in the colonization of substrata.
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