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Study on the modeling of colony pattern selection of filamentous fungi

Research Project

Project/Area Number 10640390
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionTokai University

Principal Investigator

MATSUURA Shu  Tokai University, School of High-Technology for Human Welfare, Associate Professor, 開発工学部, 助教授 (70238955)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsfungi / filamentous fungi / pattern formation / fractal / self-affinity / diffusion / colony / パターン形成
Research Abstract

Filamentous fungi show variety of colony growth patterns depending upon the environmental conditions. In this study, a multi-layer mycelial colony that had three main parameters of nutrient level, nutrient diffusion and hyphal growth rate was constructed. By comparing the model growth with the real fungal colony growth, the selection rules of mycelial colony patterns were investigated.
Without nutrient diffusion, the model colonies exhibited equivalent self-affinity in their roughening of colony fronts at any nutrient levels the colony growth can be maintained. The same result was also obtained for the cases of infinite nutrient limit case. However, the growth exponents of front roughness were found dependent upon the nutrient levels for the multi-layer models. These results showed that the hyphal production in the interior of the colonized space affected the roughening of colony fronts.
The nutrient diffusion brought about the variation of growth patterns. Particularly, as the growth ra … More te was lowered at fixed nutrient levels and nutrient diffusion coefficient, the colony exhibited reaction-limited growth and formed densely aggregated patterns. Under this condition, as the nutrient level was lowered, the ramified morphology was found to develop through reaction-limited process.
By comparing the model colony morphology with the real mycelial colonies, the pattern selection rule was found to exist in the inherent manner of response in the hyphal growth rate to the environmental nutrient levels. The wild and mutant strains of Aspergillus nidulans were grouped into two types; those maintained uniform growth at any nutrient and agar levels, and those exhibited ramified patterns at low nutrient levels. By measuring the colony expansion rates at various nutrient levels, these morphological types can be related with the mutation-induced decay of the growth rate at low nutrient levels.
Further, to consider the effect of growth inhibition by the hyphal aging etc., long-term measurement of hyphal growth rate was commenced for A. nidulans and other strains. Gradual or steep decay of hyphal growth rate was found in the growth process, and it was suggested that the manner of growth rate reduction was dependent upon the environmental nutrient levels. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Shu Matsuura: "Growth and Colony Pattering of Filamentous Fungi"Forma. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Colony pattering of Aspergillus oryzae on agar media"Mycoscience. 39. 379-390 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Colony growth of Aspergillus nidulans on D_2O Media Supplemented with Cyclodextrin"The Journal of Deuterium Science. Vol.7 No.1. 37-41 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 松浦執 他(分担執筆): "形の科学事典"朝倉書店(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Growth and Colony Patterning of Filamentous Fungi"Foema. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Colony patterning of Aspergillus oryzae on agar media"Mycoscience. 39. 379-390 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Colony Growth of Aspergillus nidulans on DィイD22ィエD2O Media Supplemented with Cyclodextrin"The Japanese Journal of Deuterium Science. Vol.7, No.1. 37-41 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura(coauthor): "Dictionary of Science on Form"Asakura Pub. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Shu Matsuura: "Growth and Colony Patternig of Filamentous Fungi"Forma. (印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] Shu Matsuura: "Colony Patterning of Aspergillus oryzae on agar media"Mycoscience. vol.39. 379-390 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Shu Matsuura: "Colony Growth of Aspergillus on D_2O Media Supplemented with Cyclodextrin"The JapaneseJournal of Deuterium Science. vol.7,No.1. 37-41 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 松浦 執: "形の科学事典"朝倉書店(印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] Shu Matsuura: "Colony patterning of Aspergillus oryzae on ogar wedia" Mycoscience. vol.39. 379-390 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Shu Matsuura: "Colony Growth of Aspergillus nidulans on D_2O Media Supplemented with Cyclodextrion" The Japanese Journal of Deuterium Science. Vol.7,No.1. 37-41 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松浦 執: "糸状菌コロニーの空間占有と成長律速要因" 東海大学紀要開発工学部. Vol.7. 57-64 (1997)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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