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Fungal growth response to carbon and nitrogen limitation: Application of a model to laboratory and field data
Departments of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Departments of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden; Departments of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
1987 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 19, no 5, 621-629 p.Article in journal (Refereed) Published
Abstract [en]

We evaluated assumptions about fungal growth regulation by applying a model to laboratory and field experimental data. Hyphal length, dry weight, CO2, solution N and solution C were measured during 140 h incubations in liquid batch cultures of Trichoderma harzianum on mineral media at three nitrogen concentrations. Assuming preferential allocation of N to maintain hyphal extension and including cytoplasm translocation gave the best agreement between model predictions and observed data for N-limited growth. When excluding translocation from the model, hyphal length increase could not be well predicted.

Fungal growth in an arable soil was simulated for two soil moisture regimes; one receiving rainfall only and one maintained in a moist condition by daily irrigation. Simulations were compared to measured total hyphal length, FDA-active hyphae and O2-consumption. Model results suggested that hyphal length increases were highly subsidized by translocation of cytoplasm. The response of the active biomass component to soil moisture conditions primarily influenced substrate availability.

Place, publisher, year, edition, pages
Elsevier, 1987. Vol. 19, no 5, 621-629 p.
National Category
Soil Science
Identifiers
URN: urn:nbn:se:oru:diva-52189DOI: 10.1016/0038-0717(87)90108-8ISI: A1987J667100020Scopus ID: 2-s2.0-38249036393OAI: oai:DiVA.org:oru-52189DiVA: diva2:970988
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2017-10-17Bibliographically approved

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