Gradients of photoinhibition in the interior of a leaf induced by photoinhibition lights of different colors

Riichi Oguchi, Peter Douwstra, Takashi Fujita, Wah Soon Chow, Ichiro Terashima

    Research output: Chapter in Book/Report/Conference proceedingChapter

    2 Citations (Scopus)


    Gradients of photoinhibition within a leaf caused by different color lights were studied to get more insight into the controversy whether photon absorption by chlorophyll or Mn is the primary cause of photoinhibition, suggested by the excess-energy hypothesis or the Mn (two-step) hypothesis, respectively. We photoinhibited lincomycin-treated leaf-discs with white, blue, green or red light. A combination of a micro-fiber fluorometer, a fiber-thinning technique and a micro-manipulator enabled us to measure the chlorophyll fluorescence signals within a leaf. Gradients of photoinhibition were also compared with results from various conventional fluorometers to estimate their depth of signal detection. The photoinhibition was more severe in the descending order of blue, red and green light near the adaxial surface, and in the descending order of blue, green and red light in the deeper tissue, which is correlated with the absorption spectrum of chlorophyll and Mn, respectively. These results cannot be explained by either hypothesis alone and strongly suggest that both mechanisms occur in photoinhibition. Fv/Fm values of photoinhibited leaves estimated with the conventional fluorometers were different from the whole tissue. This is because the depths, in which these systems detect fluorescence signals, differ depending on the wavelengths of measuring beam and detector.

    Original languageEnglish
    Title of host publicationAdvanced Topics in Science and Technology in China
    PublisherSpringer Science and Business Media Deutschland GmbH
    Number of pages6
    Publication statusPublished - 2013

    Publication series

    NameAdvanced Topics in Science and Technology in China
    ISSN (Print)1995-6819
    ISSN (Electronic)1995-6827


    • Chlorophyll fluorescence
    • Excess-energy hypothesis
    • Fluorometers
    • Mn hypothesis
    • P700 redox kinetics
    • Photoinhibition action spectra

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Engineering(all)
    • General


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