The Effect of Analogues of Dibromothymoquinone and of Bromonitrothymol on Photosynthetic Electron Flow

Trebst, Achim; Reimer, S.; Draber, W.; Knops, H. J.

doi:10.1515/znc-1979-9-1029

Cited by 33 publications

(9 citation statements)

References 15 publications

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“…A chemically different group of inhibitors active at the Q B site was later developed-nitrophenols (like BNT = bromonitrothymol) by Trebst et al (1979) and Trebst and Draber (1986) and cyanophenols (like commercial ioxynil). There are differences in their inhibitory pattern as reviewed by Oettmeier (1999) and also below.…”

Section: Inhibition Of the Acceptor Side Of Photosystem IImentioning

confidence: 99%

Inhibitors in the functional dissection of the photosynthetic electron transport system

Trebst

2007

Photosynth Res

108

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The significance of inhibitors and artificial electron acceptor and donor systems as experimental tools for studying the photosynthetic system is described by reviewing early classical articles. The historical development in unravelling the role and sequence of electron carriers and energy conserving sites in the electron transport chain is acknowledged. Emphasis is given to inhibitors of the acceptor side of photosystem II and of the plastoquinol oxidation site in the cytochrome b6/f complex. Their role in regulatory processes under redox control is introduced.

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Section: Inhibition Of the Acceptor Side Of Photosystem IImentioning

confidence: 99%

Inhibitors in the functional dissection of the photosynthetic electron transport system

Trebst

2007

Photosynth Res

108

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“…However, higher concentrations of DBMlB are able to block electron flow from Q to PQ [39. 60,187]. This was confirmed by Bowes and Crofts [20]: the Qoxidation decreased drastically in the presence of 2-20pM reduced DBMIB.…”

Section: Soriir Nriv Rlrcrron Rrunsporr Irihihirorsmentioning

confidence: 62%

The Acceptor Side of Photosystem Ii in Photosynthesis

Govindjee¹

1981

Photochem Photobiol

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“…When the water to MV assay was performed in the presence of ADP and Pi, rates of electron flow were about one-half the maximal uncoupled (+MA) rates. )2 evolution, and PSI C (12,22). However, we found poor rates of electron transport as a function of light when older tissue was used to isolate chloroplasts.…”

mentioning

confidence: 73%

“…2). Ascorbate DCBQ (Guikema, personal communications) but confirmation of nulation of oxidized this decline can be found in work presented by Trebst et al (22) icated with several where 100 lM DCBQ was found to inhibit NADP reduction as was less than 5%. well as O2 evolution.…”

mentioning

confidence: 82%

Photosynthesis in Fescue

Krueger¹,

Miles²

1981

Plant Physiol.

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Chloroplasts isolated from taDl fescue, Festuca arwudinacea Schreb., showed high rates of electron transport, comparable to rates observed for spinach chloroplasts.Chloroplasts were weDl coupled and rates of electron transport from water to methyl viologen (photosystem II and I) were increased two to five times when ADP and inorganic phosphate or methylamine (uncoupler) were added to the reaction mixture. Ratios of P:2e for photosystem II plus I were found to be near 1.2. Electron transport rates from water to pphenylenediamine or 2,6dichlorobenzoquinone (photosystem II) were over 300 micromoles 02 per hour per miligram chlorophyDl, while P:.2e ratios were found to be over 0.5. The highest rates of electron transport were found in electron flow from diaminodurene to methyl viologen (photosystem I) and P:2e ratios remained near 0.5.Light intensity saturation curves for photosystem II and I, as wel as the photosystems independently, resembled curves for spinach, with saturation of electron transport in photosystem I and photosystem II separately occurring at 35% of the available light intensity (6000 microeinsteins per square meter per second). Photosystem II and I in sequence were saturated at about half this light intensity.This report, as a preliminary study of the relationship between genome content and biochemical aspects of photosynthesis, presents a characterization of the photosynthetic electron transport system of the hexaploid tall fescue. Comparisons are made with the reported photosynthetic activities in isolated spinach chloroplasts and isolated maize tissue, two systems that have been examined extensively.Because ploidy level has been shown to affect leaf morphology (19), isolation of envelope-free chloroplasts can eliminate many variations due to physical differences; thus, direct comparison of genotypes can be made. The isolation procedure for fescue appeared difficult because the cell walls are highly silicated (27) and vegetative growth is coarse. Yet, when young, soft, actively growing tissue is harvested, little starch is isolated with the chloroplasts. Rates of electron transport and phosphorylation from this tissue are high and consistent.The results presented here show that optimal conditions for electron transport in fescue chloroplasts are similar to spinach chloroplasts. Measurements of changes in 02 concentration for PSII were 300+ tmol 02/h. mg Chl, for PSI were 1,000+ t,mol 02/h-mg Chl, and for both photosystems in sequence were 30+ (24,25) and results show increased nuclear chromosome number correlating with increased photosynthetic activity.

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The Effect of Analogues of Dibromothymoquinone and of Bromonitrothymol on Photosynthetic Electron Flow

Cited by 33 publications

References 15 publications

Inhibitors in the functional dissection of the photosynthetic electron transport system

Inhibitors in the functional dissection of the photosynthetic electron transport system

The Acceptor Side of Photosystem Ii in Photosynthesis

Photosynthesis in Fescue

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