Evidence That Spitzenkörper Behavior Determines the Shape of a Fungal Hypha: A Test of the Hyphoid Model

Bartnicki-Garcia, S. Bartnicki, D. D., Gierz, G., López-Franco, R., and Bracker, C. E. 1995. Evidence that Spitzenkörper behavior determines the shape of a fungal hypha; A test of the hyphoid model. Experimental Mycology 19, 153-159. Hyphae of the fungus Rhizoctonia solani have a characteristic Spit...

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Bibliographic Details
Published in:Experimental mycology 1995-06, Vol.19 (2), p.153-159
Main Authors: Bartnicki-Garcia, Salomon, Bartnicki, David D, Gierz, Gerhard, López-Franco, Rosamarı́a, Bracker, Charles E
Format: Article
Language:English
Subjects:
APICAL GROWTH
APLICACIONES DEL ORDENADOR
APPLICATION DES ORDINATEURS
CELL STRUCTURE
CELLS
CELLULE
CELULAS
COMPUTER APPLICATIONS
COMPUTER SIMULATION
CRECIMIENTO
CROISSANCE
EQUATIONS
ESTRUCTURA CELULAR
GROWTH
hyphal morphogenesis
hyphoid equation
HYPHOID EQUATIONS
MATEMATICAS
mathematical model
MATHEMATICAL MODELS
MATHEMATICS
MATHEMATIQUE
MICELIO
Microscopy, Phase-Contrast
Microscopy, Video
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
Models, Biological
MORFOGENESIS
MORPHOGENESE
MORPHOGENESIS
MYCELIUM
Organelles - physiology
RHIZOCTONIA
Rhizoctonia - cytology
Rhizoctonia - growth & development
RHIZOCTONIA SOLANI
SIMULACION
SIMULATION
Software
Spitzenkörper
STRUCTURE CELLULAIRE
VESICLE SUPPLY CENTER
video microscopy
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Summary:Bartnicki-Garcia, S. Bartnicki, D. D., Gierz, G., López-Franco, R., and Bracker, C. E. 1995. Evidence that Spitzenkörper behavior determines the shape of a fungal hypha; A test of the hyphoid model. Experimental Mycology 19, 153-159. Hyphae of the fungus Rhizoctonia solani have a characteristic Spitzenkörper in their growing tips and a cell shape described by the mathematical hyphoid equation. A mild disturbance of hyphae growing in a slide culture chamber on a microscope stage caused the Spitzenkörper to move away from its usual position next to the apical pole and wander briefly inside the apical dome. Hyphal elongation rate declined abruptly, and the apex became rounded and increased in diameter. As the Spitzenkörper migrated back to its polar position, rapid cell elongation resumed, and the contour of the growing hyphal tip returned to the typical hyphoid shape. The brief dislocation of the Spitzenkörper left a permanent bulge in the hyphal profile. This morphogenetic sequence was mimicked by computer simulation, based on the hyphoid equation which relates the generation of hyphal shape to the linear displacement of a vesicle supply center (VSC). The VSC was programmed to retrace the observed movements of the Spitzenkörper during the above sequence. The resulting similarity of shape between real and computer-simulated cells reinforces the mathematical prediction that the Spitzenkörper acts as a VSC and that its continuous linear advancement generates a typical hyphal tube with the characteristic hyphoid shape. Accordingly, the hyphoid model and its VSC concept provide a plausible hypothesis to explain the cellular basis of polarized growth of fungal hyphae.
ISSN:0147-5975
1878-4399
DOI:10.1006/emyc.1995.1017