Ultraweak photoemission from dark-adapted leaves and isolated chloroplasts

Èva Hideg, Masaki Kobayashi, Humio Inaba

Research output: Contribution to journalArticle

27 Citations (Scopus)


Dark-adapted isolated spinach chloroplasts and leaves, unlike sub-chloroplast fractions, are capable of emitting ultraweak light spontaneously (50-125 counts per cm2). The emission of leaves is due to two processes with activation energies of 97 and 25 kJ/mol while in isolated chloroplasts, it is the result of a single process (98 kJ/mol), as indicated by the Arrhenius plots of the intensity. Emission spectra demonstrate that the terminal step of these reactions is the excitation of chlorophyll in both samples. We suggest that the additional component in the ultraweak light emission of leaves may be related to mitochondria.

Original languageEnglish
Pages (from-to)121-124
Number of pages4
JournalFEBS letters
Issue number1-2
Publication statusPublished - Nov 26 1990


  • Arrhenius plot
  • Chloroplasts
  • Emission spectrum
  • Spinach leaf
  • Ultraweak light emission

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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