Effect of ultraviolet-A (UV-A) light on growth, photosynthetic activity and production of biopterin glucoside by the marine UV-A resistant cyanobacterium Oscillatoria sp.

Youji Wachi, J. Grant Burgess, Kaori Iwamoto, Noriko Yamada, Noriyuki Nakamura, Tadashi Matsunaga

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38 Citations (Scopus)


We have isolated a marine planktonic cyanobacterium Oscillatoria sp. NKBG 091600 which is resistant to ultraviolet-A (UV-A) irradiation. In response to UV-A irradiation this cyanobacterium produces high levels of a UV-A absorbing compound which was identified previously as biopterin glucoside. Here, we have investigated the effect of UV-A light intensity on growth, biopterin glucoside production and photosynthetic activity. Oscillatoria sp. NKBG 091600 could grow at UV-A intensities of up to 800 μW/cm2 and at 300 μW/cm2 could grow as well as in the absence of UV-A irradiation. In addition, pre-culture of cells with UV-A protected cells from UV-A induced inhibition of photosynthetic activity. Detection of biopterin glucoside levels in irradiated cells by HPLC demonstrated that after 10 h there was a rapid increase in biopterin glucoside content. This increase was dependent on the intensity of the UV-A irradiation.

Original languageEnglish
Pages (from-to)165-168
Number of pages4
JournalBBA - General Subjects
Issue number1
Publication statusPublished - 1995 May 11
Externally publishedYes



  • (Oscillatoria sp.)
  • Biopterin glucoside
  • Cyanobacterium
  • Ultraviolet A

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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