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Photosynthesis Research

, Volume 41, Issue 3, pp 371–379 | Cite as

Thermoluminescence as a probe of Photosystem II in intact leaves: Non-photochemical fluorescence quenching in peas grown in an intermittent light regime

  • Giles Johnson
  • Anja Krieger
Regular Paper

Abstract

We have measured thermoluminescence (TL) and chlorophyll fluorescence from leaves of peas grown under an intermittent light regime (IML) and followed changes in those leaves during greening. IML peas show low variable fluorescence and a certain capacity for reversible non-photochemical quenching. It has been suggested that reversible quenching may be caused by pH-dependent release of Ca2+ from Photosystem II (PS II) (Krieger and Weis (1992) Photosynthetica 27: 89–98). Under conditions in which reversible non-photochemical quenching occurs, a TL band at around 50 °C is observed, in the presence of DCMU, in IML leaves. A band in this temperature range has previously been observed in PS II depleted of Ca2+ (Ono and Inoue (1989) Biochimica et Biophysica Acta 973: 443–449). The 50 °C band disappears upon dark adaptation. In mature leaves, no significant band is seen at 50 °C. It is concluded that, in IML leaves, reversible quenching may be related to the release of Ca2+ from Photosystem II. However, it seems that in the mature system, under most conditions, such release does not contribute significantly to quenching

Key words

photosynthesis chlorophyll fluorescence high energy-state quenching calcium release 

Abbreviations

Fo

dark level of fluorescence

Fm

maximal fluorescence

Fv

variable fluorescence

IML

intermittent light

TL

thermoluminescence

Tyr

tyrosine

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Giles Johnson
    • 1
  • Anja Krieger
    • 1
  1. 1.Section de BioénergetiqueDBCM (CNRS URA 1290) Bât 532, C.E.A.-SaclayGif-sur-Yvette, CedexFrance

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