Redox changes of ferredoxin, P700, and plastocyanin measured simultaneously in intact leaves

Photosynthesis Research
U Schreiber

Abstract

Properties and performance of the recently introduced Dual/KLAS-NIR spectrophotometer for simultaneous measurements of ferredoxin (Fd), P700, and plastocyanin (PC) redox changes, together with whole leaf chlorophyll a (Chl) fluorescence (emission >760, 540 nm excitation) are outlined. Spectral information on in vivo Fd, P700, and PC in the near-infrared region (NIR, 780-1000 nm) is presented, on which the new approach is based. Examples of application focus on dark-light and light-dark transitions, where maximal redox changes of Fd occur. After dark-adaptation, Fd reduction induced by moderate light parallels the Kautsky effect of Chl fluorescence induction. Both signals are affected analogously by removal of O2. A rapid type of Fd reoxidation, observed after a short pulse of light before light activation of linear electron transport (LET), is more pronounced in C4 compared to C3 leaves and interpreted to reflect cyclic PS I (CET). Light activation of LET, as assessed via the rate of Fd reoxidation after short light pulses, occurs at very low intensities and is slowly reversed (half-time ca. 20 min). Illumination with strong far-red light (FR, 740 nm) reveals two fractions of PS I, PS I (LET), and PS I (CET), differing in the r...Continue Reading

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Citations

Apr 1, 2018·Physiologia Plantarum·Daisuke Takagi, Chikahiro Miyake
Sep 11, 2018·Plant, Cell & Environment·Vijay KumarKarl-Josef Dietz
Nov 30, 2018·The Plant Journal : for Cell and Molecular Biology·Yugo Lima-MeloEva-Mari Aro
Jun 28, 2019·Plant Direct·Lauri NikkanenEevi Rintamäki
Apr 10, 2020·International Journal of Molecular Sciences·Xiaodong LiYuanhua Wu
May 13, 2020·The Plant Journal : for Cell and Molecular Biology·Lauri NikkanenYagut Allahverdiyeva
Jan 20, 2021·Photosynthesis Research·Ulrich Schreiber, Christof Klughammer
Jul 6, 2020·Biochimica Et Biophysica Acta. Bioenergetics·Pierre SétifChikahiro Miyake
Jun 3, 2021·International Journal of Molecular Sciences·Ginga Shimakawa, Chikahiro Miyake
Jun 26, 2021·Nature Communications·Thilo RühleDario Leister
Aug 3, 2021·Photosynthesis Research·Alonso Zavafer

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Software Mentioned

KLAS
NIR
Dual

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