Karyology of conidiogenesis and endoconidium germination in Thielaviopsis basicola

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Abstract
Cytological studies on Thielaviopsis basicola revealed that other than a low frequency of multinucleate endoconidia in some isolates the uninucleate condition prevailed. Of the six isolates that were studied, three possessed some multinucleate spores. The nuclei in a multinucleate endoconidium were all derived by successive mitotic divisions of the single generative nucleus in the conidiophore. The nuclei in the multinucleate endoconidium divided independently and segregated into uninucleate and (or) multinucleate components during the course of endoconidial germination and subsequent hyphal development. The implications of the results are discussed with regard to the occurrence of cultural variability in this fungus.

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