エネルギー再配分を伴う糸状菌モデルコロニー

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Colony growth of filamentous fungi is mainly restricted by environmental conditions such as nutrient content. Absorbed nutrients are distributed to produce propagules and vegetative hyphae to promote further proliferation and exploration of substrate. To examine the effect of energy redistribution in the pattern formation of hyphal colonies, we constructed a basic computer model of hyphal growth on a 2-dimensional square lattice space. In this model, the total amount of nutrient particles are evenly distributed in the lattice space initially. A seed hyphal unit adsorbs the nutrient particles, and it creates an additional hyphal unit when the amount of absorbed nutrient accumulates to a certain critical level. We considered two limiting cases of nutrient supply. In the first, each nutrient particle walked at random on the lattice until it reached one of the neighboring sites of the hyphal cluster. This is a diffusion-controlled limit. In the second, as a reaction-controlled limit, randomly chosen hyphae were provided with nutrient particles repeatedly, as far as the nutrient was not depleted in the area in which the chosen hypha was located. Further, we examined two energy redistribution versions. In the uniform distribution version, nutrient particles stored in a hyphal system were evenly redistributed ; In the peripheral growth version, they were drained from the older portion of the hyphal system and re-allocated to the peripheral zone. Our simulation demonstrates that the colony shape changes from compact to ramified as the total amount of nutrient particles initially is lowered. Also, the particle diffusion leads to the development of instability in the peripheral shapes. Finally, the colony explores outer space with less nutrient uptake when the nutrient allocation enhances peripheral growth.
東海大学の論文
1997-03-30

著者

松浦執
東海大学開発工学部

エネルギー再配分を伴う糸状菌モデルコロニー

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