Effects of light intensity on cyclic electron flow around PSI and its relationship to non-photochemical quenching of Chl fluorescence in tobacco leaves

Chikahiro Miyake, Sayaka Horiguchi, Amane Makino, Yuki Shinzaki, Hiroshi Yamamoto, Ken Ichi Tomizawa

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

We tested the hypothesis that plants grown under high light intensity (HL-plants) had a large activity of cyclic electron flow around PSI (CEF-PSI) compared with plants grown under low light (LL-plants). To evaluate the activity of CEF-PSI, the relationships between photosynthesis rate, quantum yields of both PSII and PSI, and Chl fluorescence parameters were analyzed simultaneously in intact leaves of tobacco plants which had been grown under different light intensities (150 and 1,100 μmol photons m-2 s-1, respectively) and with different amounts of nutrients supplied. HL-plants showed a larger value of non-photochemical quenching (NPQ) of Chl fluorescence at the limited activity of photosynthetic linear electron flow. Furthermore, HL-plants had a larger activity of CEF-PSI than LL-plants. These results suggested that HL-plants dissipated the excess photon energy through NPQ by enhancing the ability of CEF-PSI to induce acidification of the thylakoid lumen. JSPP

Original languageEnglish
Pages (from-to)1819-1830
Number of pages12
JournalPlant and Cell Physiology
Volume46
Issue number11
DOIs
Publication statusPublished - 2005 Nov 1

Keywords

  • Chl fluorescence
  • Cyclic electron flow
  • Non-photochemical quenching (NPQ)
  • PSI
  • Photosynthesis

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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