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The kinetics of mycelial growth.

A L Koch

    Journal of General Microbiology
    |August 1, 1975
    PubMed
    Summary

    Fungal colony growth, whether on surfaces or submerged, follows logistic principles. Differences in mass increase rates stem from how invading hyphae initially occupy space, impacting overall fungal development.

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    Area of Science:

    • Mycology
    • Mathematical Biology
    • Biophysics

    Background:

    • Fungal colonies exhibit diverse growth patterns.
    • Understanding these patterns is crucial for predicting fungal development in various environments.
    • Previous studies by Deppe (1973) and Trinci (1970) highlighted different mass increase dynamics.

    Purpose of the Study:

    • To develop formulae for fungal colony growth under geometric constraints.
    • To reconcile differing observations of fungal mass increase in surface versus submerged growth.
    • To elucidate the relationship between initial hyphal occupation and growth dynamics.

    Main Methods:

    • Applied logistic growth law to model fungal colony expansion.
    • Analyzed existing data on surface colony growth (Deppe, 1973).
    • Analyzed existing data on submerged pellet growth (Trinci, 1970).

    Main Results:

    • Linear dimensions of fungal colonies increase linearly regardless of mass change.
    • Surface colonies show exponential mass growth, while submerged colonies exhibit cubic time-dependent mass increase.
    • Disparate growth behaviors are attributed to the initial proportion of space occupied by invading hyphae.

    Conclusions:

    • Fungal growth dynamics are contingent on the initial spatial occupation by hyphae.
    • The 'carrying capacity' of a region influences whether growth is exponential or cubic.
    • Geometric constraints and initial invasion strategy critically determine the applicable growth law for fungal colonies.

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