Inhibition of Chloroplast Electron Transport Reactions by Trifluralin and Diallate

Robinson, Steven J.; Yocum, Charles F.; Ikuma, Hiroshi; Hayashi, Fumio

doi:10.1104/pp.60.6.840

Cited by 27 publications

(6 citation statements)

References 15 publications

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“…This has also been stressed by Barr et al for other plasto quinone antagonists [10]. It should be mentioned that Robinson et al [37] have reported that trifluralin, a dinitroaniline herbicide inhibits photosynthet ic electron flow like DBMIB. …”

Section: Discussionmentioning

confidence: 86%

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

Trebst

Reimer

Draber

et al. 1979

Zeitschrift Für Naturforschung C

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Alkyl substituted derivatives of halogenated p-benzoquinones, of halogenated /7-nitrophenols, and of 2,4-dinitrophenols were tested in the inhibition of photosynthetic electron flow in chloro plasts. The effect of the compounds on photoreductions by photosystem I or II, on a TMPD bypass in NADPH formation and the reversibility of the inhibition by dithiothreitol is used to distin guish between an inhibition site before or after plastoquinone function, i. e. between a DBMIB versus a DCMU inhibition pattern.It is shown, that different isopropyl and /-butyl substituted halogenated p-benzoquinones are as effective and specific as DBMIB in the inhibition of plastoquinone function.Alkyl substituted /^-nitrophenols, with an additional halogen-or nitro-group at C-2, are shown to be effective electron flow inhibitors. The new potent nitrophenol derivatives inhibit at the site of DCMU action, nevertheless they do not contain the basic chemical element essential for inhibi tion common to DCMU and its many herbicidal analogues. Small changes in the ring-substitution can alter the inhibition pattern from a DCMU typ to a DBMIB typ inhibition.

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Section: Discussionmentioning

confidence: 86%

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

Trebst

Reimer

Draber

et al. 1979

Zeitschrift Für Naturforschung C

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“…Data were digitized and analyzed by a least-squares fitting procedure using a minicomputer. The procedures for measurements of oxygen evolution activity and lightinduced cytochrome f oxidation/reduction changes have been described previously [39]. Illumination of NMR samples utilized a beam of white light (>106 ergs.…”

Section: Methodsmentioning

confidence: 99%

NMR relaxivity changes in chloroplast suspensions. Effects of NH2OH and of treatments altering the redox state of the photosynthetic electron transport chain

Robinson

Sharp

Yocum

1980

Biochimica et Biophysica Acta (BBA) - Bioenergetics

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Treatments (illumination, chemical oxidation or reduction) which are potentially capable of producing paramagnetic centers in chloroplast thylakoid membranes do not produce enhancements of the proton magnetic relaxivities of these preparations. However, exposure of thylakoid membranes to varying concentrations of hydroxylamine induces a time-dependent increase in relaxivity for which the steady-state magnitude is dependent on hydroxylamine concentration. The appearance of relaxivity is correlated kinetically with inactivation of oxygen-evolving centers; in addition both processes show a threshold effect with respect to hydroxylamine concentration. Kinetic analyses of these hydroxylamine-induced effects suggest that at low (less than or equal to 100 microM) and at intermediate (200--500 microM) concentrations, hydroxylamine extraction is partially counteracted by a reverse process that reactivates oxygen-evolving centers in the dark.

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“…Blue arrows indicate the antimycin A‐sensitive pathway, and green arrows indicate the antimycin A‐insensitive or NDH‐dependent pathway. Redox‐reagent‐supported cyclic electron transport (shown in orange) has been studied extensively many years ago (e.g., Jagendorf & Avron, ; Robinson et al, ). The main function of the three pathways is the production of ATP for the Calvin–Benson cycle and many other ATP‐dependent intracellular processes.…”

Section: The Supply Of Atp Via Cyclic Electron Transport Contributes mentioning

confidence: 99%

ATP is a driving force in the repair of photosystem II during photoinhibition

Murata

Nishiyama

2017

Plant Cell & Environment

122

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Repair of photosystem II (PSII) during photoinhibition involves replacement of photodamaged D1 protein by newly synthesized D1 protein. In this review, we summarize evidence for the indispensability of ATP in the degradation and synthesis of D1 during the repair of PSII. Synthesis of one molecule of the D1 protein consumes more than 1,300 molecules of ATP equivalents. The degradation of photodamaged D1 by FtsH protease also consumes approximately 240 molecules of ATP. In addition, ATP is required for several other aspects of the repair of PSII, such as transcription of psbA genes. These requirements for ATP during the repair of PSII have been demonstrated by experiments showing that the synthesis of D1 and the repair of PSII are interrupted by inhibitors of ATP synthase and uncouplers of ATP synthesis, as well as by mutation of components of ATP synthase. We discuss the contribution of cyclic electron transport around photosystem I to the repair of PSII. Furthermore, we introduce new terms relevant to the regulation of the PSII repair, namely, "ATP-dependent regulation" and "redox-dependent regulation," and we discuss the possible contribution of the ATP-dependent regulation of PSII repair under environmental stress.

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Inhibition of Chloroplast Electron Transport Reactions by Trifluralin and Diallate

Abstract: ABSTRACrTheherbicIdes tulurain(a,a,a-tifuoro-2,6-dinitro-N,N.dipropyl.ptohldine) and difte 3dihIoroallyl]

Cited by 27 publications

References 15 publications

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

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

NMR relaxivity changes in chloroplast suspensions. Effects of NH2OH and of treatments altering the redox state of the photosynthetic electron transport chain

ATP is a driving force in the repair of photosystem II during photoinhibition

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