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Fluorescence characteristics of photoautotrophic soybean cells

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Abstract

We report here the first measurements on chlorophyll (Chl) a fluorescence characteristics of photoautotrophic soybean cells (cell lines SB-P and SBI-P). The cell fluorescence is free from severe distortion problems encountered in higher plant leaves. Chl a fluorescence spectra at 77 K show, after correction for the spectral sensitivity of the photomultiplier and the emission monochromator, peaks at 688, 696 and 745 nm, representing antenna systems of photosystem II-CP43 and CP47, and photosystem I, respectively. Calculations, based on the complementary area over the Chl a fluorescence induction curve, indicated a ratio of 6 of the mobile plastoquinone (including QB) to the primary stable electron acceptor, the bound plastoquinone QA. A ratio of one between the secondary stable electron acceptor, bound plastoquinone QB, and its reduced form QB - was obtained by using a double flash technique. Owing to this ratio, the flash number dependence of the Chl a fluorescence showed a distinct period of four, implying a close relationship to the ‘S’ state of the oxygen evolution mechanism. Analysis of the QA - reoxidation kinetics showed (1) the halftime of each of the major decay components (∼ 300 μs fast and ∼ 30 ms slow) increases with the increase of diuron and atrazine concentrations; and (2) the amplitudes of the fast and the slow components change in a complementary fashion, the fast component disappearing at high concentrations of the inhibitors. This implies that the inhibitors used are able to totally displace QB. In intact soybean cells, the relative amplitude of the 30 ms to 300 μs component is higher (40:60) than that in spinach chloroplasts (30:70), implying a larger contribution of the centers with unbound QB. SB-P and SBI-P soybean cells display a slightly different sensitivity of QA - decay to inhibitors.

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Abbreviations

CA:

complementary area over fluorescence induction curve

Chl:

chlorophyll, diuron

DCMU:

3-(3,4-dichlorophenyl)-1,1-dimethylurea

F m :

maximum chlorophyll a fluorescence

F 0 :

minimum chlorophyll a fluorescence

F v =:

F t-F0

where F v =:

variable chlorophyll a fluorescence

and Ft =:

chlorophyll a fluorescence at time t

PS II:

photosystem II

Q a :

primary (plastoquinone) electron acceptor of PS II

Q b :

secondary (plastoquinone) electron acceptor of PS II

t50 :

the time at which the concentration of reduced Q a is 50% of that at its maximum value

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Authors and Affiliations

  1. Department of Physiology and Biophysics, University of Illinois at Urbana-Champaign, 61801, IL, USA

    C. Xu &  Govindjee

  2. Department of Agronomy, University of Illinois at Urbana-Champaign, 61801, IL, USA

    S. M. D. Rogers, C. Goldstein & J. M. Widholm

  3. Department of Plant Biology, University of Illinois at Urbana-Champaign, 61801, IL, USA

    Govindjee

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  1. C. Xu
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  2. S. M. D. Rogers
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  3. C. Goldstein
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  4. J. M. Widholm
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  5. Govindjee
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Xu, C., Rogers, S.M.D., Goldstein, C. et al. Fluorescence characteristics of photoautotrophic soybean cells. Photosynth Res 21, 93–106 (1989). https://doi.org/10.1007/BF00033363

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