Parallel assessment of ROS formation and photosynthesis in leaves by fluorescence imaging

Éva Hideg, Ulrich Schreiber

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36 Citations (Scopus)

Abstract

Stress-induced generation of reactive oxygen species (ROS) leads to lowering of the biochemical yield of photosynthesis in plant leaves. The detrimental effects of oxidative stress by paraquat are initiated by the generation of superoxide anion radicals in the vicinity of the thylakoid membrane. However, direct proof of ROS production has been elusive. In this study, we report first in vivo detection and imaging of the generated superoxide in illuminated tobacco leaves following paraquat infiltration. This was done using a newly developed imaging apparatus capable of detecting changes in the fluorescence of the ROS sensor 3-(N-dansyl)aminomethyl-2,2,5,5-tetramethyl-2,5- dihydro-1H-pyrrole. Under identical conditions, the effects on photosynthesis caused by the oxidative stress were assessed via chlorophyll fluorescence imaging and the saturation pulse method. In the future, the combination of these two imaging techniques may provide information on the spatial distribution and extent of stress induced ROS production in plant leaves, as well as on the protective ability of various free radical scavengers and antioxidants.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalPhotosynthesis research
Volume92
Issue number1
DOIs
Publication statusPublished - Apr 2007

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Keywords

  • Chl-a fluorescence
  • Electron transport
  • Fluorescence imaging
  • PAM
  • Paraquat
  • ROS

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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