Vesicle trafficking via the Spitzenkörper during hyphal tip growth in Rhizoctonia solani

J. Dijksterhuis, D. Molenaar

    Research output: Contribution to journal/periodicalArticleScientificpeer-review


    Growing hyphae of Rhizoctonia solani were stained with the endocytic marker dye FM4-64 and imaged by confocal microscopy. Staining of the plasma membrane was followed by labeling of organelles in the cytoplasm (after ~1 min) and of the Spitzenkörper (Spk; after ~2 min). Fluorescence recovery after photobleaching (FRAP) of the stained Spk demonstrated the vectorial flow of secretory vesicles from the apical cytoplasm to the Spk. This flux was modelled in a two-compartment model. The turnover time of the vesicles of the Spk was estimated to be 1.3-2.5 min. These results are roughly consistent with the expected flux of vesicles through the Spk based on the number of secretory vesicles within the Spk and the number of secretory vesicles that would be necessary to fuse with the apical plasma membrane to maintain hyphal extension rates. These results suggest that membrane retrieval via endocytosis is not as significant as previously suggested. © 2013 Springer Science+Business Media Dordrecht.
    Original languageEnglish
    Pages (from-to)921-931
    JournalAntonie Van Leeuwenhoek International Journal of General and Molecular Microbiology
    Issue number4
    Publication statusPublished - 2013


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