Two sites of inhibition of the photosynthetic electron transport chain by the herbicide trifluralin

Magdolna Droppa, Sándor Demeter, Gábor Horváth

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The effect of trifluralin on the photosynthetic electron transport has been investigated by oxygen evolution and thermoluminescence measurements. The results confirm the earlier observations that trifluralin at low concentrations blocks electron transport between the two photosystems probably at the same site as DBMIB does. At higher concentrations however, trifluralin inhibits the reaction from H2O ↔ PBQ also and affects the thermoluminescence of chloroplasts in a manner similar to DCMU. These results suggest that trifluralin has a second inhibitory site therefore the useof trifluralin as a specific inhibitor of electron transport has to be questioned.

Original languageEnglish
Pages (from-to)853-855
Number of pages3
JournalZeitschrift fur naturforschung - section c journal of biosciences
Issue number9-10
Publication statusPublished - Oct 1 1981



  • Herbicide
  • Inhibition
  • Photosynthetic Electron Transport
  • Thermoluminescence
  • Trifluralin

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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