Summary
Time-lapse light micrographs of conidium development in the hyphomycete fungusPleiochaeta setosa (Kirchn.) Hughes, illustrate what appears to be normal holoblastic conidiogenesis followed by sympodial proliferation of the conidiogenous cell. Transmission and scanning electron micrographs, however, show that the wall of the conidium initial arisesde novo and endogenously from a conidiogenous mother cell. Maturation of conidia and setulae, nuclear behaviour and changes in cytoplasmic organelles are described. Sympodial proliferation of conidiophores is also shown to involve a new wall laid down under the septum delimiting the conidium from the conidiogenous cell. This layer extends down the sides of the conidiophore apex and erupts through the original conidiophore wall to produce the next conidium initial. The significance of these wall layers is discussed in relation to other types of conidiogenesis which have been characterized ultrastructurally, especially the phialidic and annellidic conidiogenous modes.
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Harvey, I.C. Light and electron microscope observations of conidiogenesis inPleiochaeta setosa (Kirchn.) Hughes. Protoplasma 82, 203–221 (1974). https://doi.org/10.1007/BF01276308
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DOI: https://doi.org/10.1007/BF01276308