Analysis of the causative gene for the albino phenotype of the white koji fungus, <i>Aspergillus luchuensis</i> mut. <i>kawachii</i> NBRC 4308

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  • KADOOKA Chihiro
    United Graduate School of Agricultural Sciences, Kagoshima University Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • GOUBARU Shohei
    Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • KUBO Shingo
    Research Support Center, Institute for Research Promotion, Kagoshima University
  • ONOUE Masahira
    Research Support Center, Institute for Research Promotion, Kagoshima University
  • OKUTSU Kayu
    Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • YOSHIZAKI Yumiko
    United Graduate School of Agricultural Sciences, Kagoshima University Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • TAKAMINE Kazunori
    United Graduate School of Agricultural Sciences, Kagoshima University Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • GOTO Masatoshi
    United Graduate School of Agricultural Sciences, Kagoshima University Applied Biochemistry and Food Science Course, Faculty of Agriculture, Saga University
  • TAMAKI Hisanori
    United Graduate School of Agricultural Sciences, Kagoshima University Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University
  • FUTAGAMI Taiki
    United Graduate School of Agricultural Sciences, Kagoshima University Education and Research Center for Fermentation Studies, Faculty of Agriculture, Kagoshima University

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Other Title
  • 白麹菌<i>Aspergillus luchuensis</i> mut. <i>kawachii</i> NBRC 4308のアルビノ表現型の原因遺伝子の解析
  • 白麹菌Aspergillus luchuensis mut. kawachii NBRC 4308のアルビノ表現型の原因遺伝子の解析
  • シロ コウジキン Aspergillus luchuensis mut. kawachii NBRC 4308 ノ アルビノ ヒョウゲンガタ ノ ゲンイン イデンシ ノ カイセキ
  • Analysis of the causative gene for the albino phenotype of the white koji fungus, Aspergillus luchuensis mut. kawachii NBRC 4308

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Melanin has an important role in conidial pigmentation and tolerance to environmental stress in filamentous fungi. A white koji fungus, Aspergillus luchuensis mut. kawachii, was isolated as an albino mutant from the black koji fungus, Aspergillus luchuensis. In this study, we found that A. luchuensis mut. kawachii produces black colored conidia by complementation of the wild type pksP gene, which encodes a polyketide synthase involved in the biosynthesis of dihydroxynaphthalene（DHN）-melanin. The pksP complementation and overexpression did not affect the colony size or conidial surface structure in A. luchuensis mut. kawachii, but did cause an increase in the number of conidia per colony area. In addition, the pksP overexpression strain produced a larger amount of dark yellowish pigment during the hyphal growth than the control strain. Moreover, the conidia of pksP complementation and overexpression strains showed higher resistance against ultraviolet light, hydrogen peroxide, and ion beams than that of the control strain. These findings will help expand our understanding of the characteristic features of A. luchuensis mut. kawachii.

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