release of elongated, sheathed ascospores from bottle-shaped asci in Dipodascus geniculatus

Yeasts use different mechanisms to release ascospores of different lengths from bottle-shaped asci. Round to oval-shaped ascospores are enveloped in oxylipin-coated compressible sheaths, enabling ascospores to slide past each other when they reach the narrowing ascus neck. However, more elongated as...

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Bibliographic Details
Published in:FEMS yeast research 2007-03, Vol.7 (2), p.173-179
Main Authors: van Heerden, Ané, van Wyk, Pieter W.J, Botes, Piet J, Pohl, Carolina H, Strauss, Catharina J, Nigam, Santosh, Kock, Johan L.F
Format: Article
Language:English
Subjects:
3‐hydroxy oxylipins
Acetylsalicylic acid
Asci
Ascospores
Coatings
compressible sheaths
Dipodascus
Dipodascus geniculatus
elongated ascospore
Lipids - analysis
Microscopy, Confocal
release mechanism
Saccharomycetales - physiology
Saccharomycetales - ultrastructure
Sexual reproduction
Sheaths
Spores, Fungal - chemistry
Spores, Fungal - physiology
Spores, Fungal - ultrastructure
Turgor
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Summary:Yeasts use different mechanisms to release ascospores of different lengths from bottle-shaped asci. Round to oval-shaped ascospores are enveloped in oxylipin-coated compressible sheaths, enabling ascospores to slide past each other when they reach the narrowing ascus neck. However, more elongated ascospores do not contain sheaths, but are linked by means of oxylipin-coated interlocked hooked ridges on the surfaces of neighboring ascospores, thereby keeping them aligned while they are pushed towards the ascus tip by turgor pressure. In this study, we found elongated, oxylipin-coated sheathed ascospores in Dipodascus geniculatus that are released effectively from bottle-shaped asci without alignment. This is possible because the ascus neck and opening have a diameter that is the same as the length of the ascospore, thus allowing the ascospores to turn sideways without blocking the ascus when they are released. We found that increased concentrations of acetylsalicylic acid inhibit both ascospore release and 3-hydroxy oxylipin production in this yeast, thereby implicating this oxylipin in sexual reproduction.
ISSN:1567-1356
1567-1364
DOI:10.1111/j.1567-1364.2006.00177.x