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Ultrastructural study of microcyclic macroconidiation in Neurospora crassa

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Abstract

Heat-shock of macroconidia of Neurospora crassa at 46°C followed by shift-down to 25°C determines premature conidiogenesis.

The nuclei and cytoplasm of heat-treated, swollen conidia contain spots of a dense material especially concentrated around the nucleolus in short time treated ones. In the first proconidium apically budding on the enlarged tip of the premature conidiophore, small vesicles are peripherally spread. A few such vesicles are later seen lining the initially simple septum separating the proconidial units into conidia. The doubling of this interconidial septum is surface viewn as a thick annulus. Disarticulation of the conidial units intervenes along a septal furrow of electroluscent material. Interconidial continuity through the septal pores is transiently insured by a connective which is ruptured for final liberation of the conidia.

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Authors and Affiliations

  1. Laboratoire de Microbiologie, Département de Biologie végétale, Université de Genève, 3, Place de l'Université, CH-1211, Genève 4, Switzerland

    T. C. Ton That & G. Turian

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  1. T. C. Ton That
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  2. G. Turian
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That, T.C.T., Turian, G. Ultrastructural study of microcyclic macroconidiation in Neurospora crassa . Arch. Microbiol. 116, 279–288 (1978). https://doi.org/10.1007/BF00417852

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  • DOI: https://doi.org/10.1007/BF00417852

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