Effect of UV-A radiation on photosynthetic electron transport

Enikö Turcsányi, Imre Vass

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We have studied the inhibition of photosynthetic electron transport by UV-A (320-400nm)radiation in isolated spinach thylakoids by flash-induced oxygen and thermolumniscence (TL) measurements. The flash pattern of oxygen evolution showed an increased amount of the S0 state in the dark, which indicate a direct effect of UV-A radiation in the water-oxidizing complex. TL measurements revealed the UV-A induced loss of PSII centers. Flash-induced oscillation of the B TL band, originating from the S2QB- recombination, indicated a UV-A induced decrease in the amount of QB- relative to QB. In conclusion, our data show that UV-A radiation is highly damaging for PSII, whose electron transport is affected both at the water oxidizing complex, and the binding site of the QB quinone electron acceptor.

Original languageEnglish
Pages (from-to)171-173
Number of pages3
JournalActa Biologica Szegediensis
Issue number3-4
Publication statusPublished - Jan 1 2002



  • Oxygen evolution
  • Photosystem II
  • Spinach
  • Thermoluminescence
  • UV-4 irradiation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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