Summary
Isolates of 10 species of Sect. Asymmetrica of the genus Penicillium were cultivated on three nutrient agar media: Czapek, Potato-carrot agar and synthetic nutrient agar(SNA). Morphological features of the conidiophores during their development were followed directly in petri dishes. In all isolates studied, the beginning of conidiophore development has common characteristics and its final structure on all media used corresponds to the taxonomical classification of each species. Variability of the penicillus within a species frame corresponds to various stages of its individual development. The structure of the conidiophores could be best followed on Potato-carrot agar. When investigating the formation of the conidiophore in Penicillium soppii on this medium an abnormal form of the primary conidiogenous cell was observed, from which several chains of conidia were simultaneously produced, in a manner similar to a polyblastic phialide.
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GAMS: I wonder if the very weak media you use are causing suboptimal development. Perhaps because there are insufficient nutrients to develop a proper cell wall. Perhaps the wall is more elastic than usual and this may explain some of the phenomena you have seen.
NIRENBERG: Sometimes weak media are useful for following development and observing the roughness of the walls. When using a weak medium, however, it is important to consider the quality of the agar and the length of time for autoclaving. Autoclaving for too long results in PH changes.
PATERSON: Is the development of penicillus structure similar on these weak media to that on the media normally used?
FASSATIOVÂ: Yes, the structures are similar, although they may take longer to develop, and the branching density may be less.
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Fassatiová, O. (1986). Evaluation of Some Morphological Features of Asymmetric Penicillia on Different Media. In: Samson, R.A., Pitt, J.I. (eds) Advances in Penicillium and Aspergillus Systematics. NATO ASI Series, vol 102. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1856-0_10
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DOI: https://doi.org/10.1007/978-1-4757-1856-0_10
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