Contribution of extracellular substances to cell protective abilities against UV radiation and differentiation of germination, vegetative cells and hormogonia, during their life cycle in Nostoc sp. HK-01

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  • Ong Midori
    Graduate school of Life and Environmental Sciences, University of Tsukuba
  • Tokita Miku
    Graduate school of Life and Environmental Sciences, University of Tsukuba
  • Katoh Hiroshi
    Division of Plant Functional Genomics, Advanced Science Research Promotion Center, Organization for Research Initiative and Promotion, Mie University
  • Abe Tomoko
    School of Science and Engineering, Tokyo Denki University
  • Takahashi Sayaka
    Department of Life, Environment and Applied Chemistry, Graduate School of Fukuoka Institute of Technology
  • Mita Hajime
    Department of Life, Environment and Applied Chemistry, Faculty of Engineering, Fukuoka Institute of Technology
  • Nakagawa Kazumichi
    SANKEN, Osaka University
  • Suzuki Toshisada
    Faculty of Agriculture, Kagawa University
  • Tomita-Yokotani Kaori
    Faculty of Life and Environmental Sciences, University of Tsukuba

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タイトル別名
  • Contribution of extracellular substances to cell protective abilities against UV radiation and differentiation of germination, vegetative cells and hormogonia, during their life cycle in <i>Nostoc</i> sp. HK-01

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<p>The functions of extracellular substances (ESs) that contribute to the protection of cells against ultraviolet (UV) radiation were investigated in the terrestrial cyanobacterium, Nostoc sp. HK-01. The original advanced method was used successfully and was found useful for UV- protective bioassay. Cells with and without ESs were exposed to UV radiation, and results showed the survival rate of the cells with ESs was higher than that of the cells without ESs. The ES of Nostoc sp. HK-01 did not show the specific reflection; however, the high absorption in the UV range, especially UV-C range, was investigated. The results indicated the presence of substances with UV-C protection properties in the ES. Additionally, we confirmed other functions related to cell differentiation, namely, akinete germination, differentiation to vegetative cells, and differentiation to hormogonia, in ES. This phenomenon showed in a limited concentration of ES. In the germination test, contribution of elements in ESs had great effect; however, some inhibiting and promoting effects were confirmed as some organic compound. The occurrence of differentiation in hormogonia by ESs was first examined and confirmed during the early stages of akinete germination. Our results demonstrated that Nostoc sp. HK-01 cells may have unique abilities during cell hydration and drying under harsh environmental conditions.</p>

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  • Eco-Engineering

    Eco-Engineering 35 (1), 13-23, 2023-01-31

    生態工学会

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