The irreversible photoinhibition of the photosystem II complex in leaves of Vicia faba under strong light

Éva Hideg, Norio Murata

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13 Citations (Scopus)

Abstract

Exposure of the photosynthetic machinery to strong light causes the photoinhibition of the photosystem II complex. The recovery from the photoinhibition in vivo was characterized by monitoring the ratio of variable to maximum fluorescence (F(v)/F(m)) in detached leaves of broad bean (Vicia faba). The changes in the ratio were explained in terms of three components, namely, two saturating exponential components with half rise-times of about 15 and 120 min, respectively, and a non-recovery component. The non-recovery component increased gradually as the exposure to strong light was prolonged. Our results suggest that this irreversible component of the photoinhibition of the photosystem II complex was caused by severe stress due to strong light under which repair of the photosystem II complex was insufficient to allow full recovery. The irreversible photoinhibition is discussed in terms of both the physiology and ecology of plants.

Original languageEnglish
Pages (from-to)151-158
Number of pages8
JournalPlant Science
Volume130
Issue number2
DOIs
Publication statusPublished - Dec 22 1997

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Keywords

  • Chlorophyll fluorescence
  • Irreversible photoinhibition
  • Light stress

ASJC Scopus subject areas

  • Genetics
  • Agronomy and Crop Science
  • Plant Science

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