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J Bacteriol. 1970 November; 104(2): 989-1009
Copyright © 1970 American Society for Microbiology. All Rights Reserved.

Protoplasmic Organization of Hyphal Tips Among Fungi: Vesicles and Spitzenkörper

Stanley N. Grove and Charles E. Bracker

Department of Botany and Plant Pathology, Purdue University, Lafayette, Indiana 47907

ABSTRACT

Hyphal tips of fungi representing Oömycetes, Zygomycetes, Ascomycetes, Basidiomycetes, and Deuteromycetes were examined by light and electron microscopy and compared with respect to their protoplasmic organization. In all fungi studied, there is a zone at the hyphal apex which is rich in cytoplasmic vesicles but nearly devoid of other cell components. Some vesicle profiles are continuous with the plasma membrane at the apices of these tip-growing cells. The subapical zones of hyphae contain an endomembrane system which includes smooth-surfaced cisternae associated with small clusters of vesicles. The findings are consistent with the hypothesis that vesicles produced by the endomembrane system in the subapical region become concentrated in the apex where they are incorporated at the expanding surface. Septate fungi (Ascomycetes, Basidiomycetes, and Deuteromycetes) have an apical body (Spitzenkörper) which is associated with growing hyphal tips. In electron micrographs of these fungi, an additional specialized region within the accumulation of apical vesicles is shown for the first time. This region corresponds on the bases of distribution among fungi, location in hyphae, size, shape and boundary characteristics to the Spitzenkörper seen by light microscopy. This structure is not universally associated with tip growth, whereas apical vesicles are widespread among tip-growing systems.

J Bacteriol. 1970 November; 104(2): 989-1009
Copyright © 1970 American Society for Microbiology. All Rights Reserved.



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