Journal Article

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 and Ken-ichi Tomizawa

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 11, pages 1819-1830
Published in print November 2005 | ISSN: 0032-0781
Published online November 2005 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pci197
Effects of Light Intensity on Cyclic Electron Flow Around PSI and its Relationship to Non-photochemical Quenching of Chl Fluorescence in Tobacco Leaves

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  • Biochemistry
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  • Plant Sciences and Forestry

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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.

Keywords: Chl fluorescence; Cyclic electron flow; Non-photochemical quenching (NPQ); Photosynthesis; PSI; CEF-PSI, cyclic electron flow around PSI; DPS, de-epoxidation state; Fd, ferredoxin; FNR, ferredoxin-NADP oxidoreductase; FQR, ferredoxin-quinone oxidoreductase; Φ(PSII), quantum yield of PSII; HL, high light; HLHN, high light high nitrogen; HLMN, high light middle nitrogen; Je(PSII), electron flux in PSII; LEF, linear electron flow; LL, low light; LLLN, low light low nitrogen; LLMN, low light middle nitrogen; NDH, NAD(P)H oxidoreductase; NPQ, non-photochemical quenching; PC, plastocyanin; PFD, photon flux density; PQ, plastoquinone; Qp, photochemical quenching; Rubisco, RuBP carboxylase/oxygenase; RuBP, ribulose-1,5-bisphosphate

Journal Article.  8475 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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