Comparative thermoluminescence study of triazine-resistant and -susceptible biotypes of Erigeron canadensis L

Demeter, S.; Vass, Imre; Hideg, Éva; Sallai, Anna

doi:10.1016/0005-2728(85)90077-5

Cited by 48 publications

(22 citation statements)

References 25 publications

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“…Demeter et al [16] reported altered properties of the B-band of herbicide resistant strains (i.e. downshift of 15 °C in Erigeron canadensis at pH 7.5).…”

Section: Resultsmentioning

confidence: 99%

“…Furtherm ore, as peak temperature and shape of the glow curves depend on the activation free energy of the recom bination reaction, these param eters provide a measure of the redox poten tial difference between the involved redox couples [14,15]. Altered properties of the B-band in herbi cide-resistant strains compared to susceptible wild types have been clearly dem onstrated [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Application of Thermoluminescence to Herbicide Studies

Gleiter

Ohadh

Hirschberg

et al. 1990

Zeitschrift Für Naturforschung C

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“…Demeter et al [16] reported altered properties of the B-band of herbicide resistant strains (i.e. downshift of 15 °C in Erigeron canadensis at pH 7.5).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Application of Thermoluminescence to Herbicide Studies

Gleiter

Ohadh

Hirschberg

et al. 1990

Zeitschrift Für Naturforschung C

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“…Chloroplasts were isolated from market spinach as described previously [8] and suspended in a Hepes buffer (50 mM Hepes, pH 7.2, containing 0.4 M sorbitol, 10 mM NaCl, 5 mM MgC12, 2 mM EDTA and 1 mM MnC12) to approximately 1500/zg/ml chlorophyll concentration. This suspension was diluted further with the same buffer to the concentrations required.…”

Section: Methodsmentioning

confidence: 99%

High resolution emission spectra of one second delayed fluorescence from chloroplasts

Hideg

Scott²,

Inaba

1989

FEBS Letters

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“…The downshift in the B-band peak temperature that is observed in several Ser264 mutants has been interpreted as a destabilisation of the QJQi redox couple (Demeter et al, 1985;Etienne et al, 1990;Gleiter et al, 1992) so that the equilibrium constant for the reaction QiQR-+QAQ; is reduced from approximately 16 in wild-type to, for example, about 3.5 in both a cyanobacterial (Gleiter et al, 1992) and higher plant S264A mutant (Demeter et al, 1985). However Crofts and co-workers (Crofts et al, 1993) have argued that in a S264A mutant of C. reinhardtii it is the binding of plastoquinone to the Q, site that is perturbed rather than its redox potential.…”

Section: Effects On Electron-transport Propertiesmentioning

confidence: 99%

Reduced Turnover of the D1 Polypeptide and Photoactivation of Electron Transfer in Novel Herbicide Resistant Mutants ofSynechocystissp. PCC 6803

Chjesa

Friso

Deák

et al. 1997

European Journal of Biochemistry

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Two missense mutants, A263P and S264P, and a deletion mutant des-Ala263, Ser264, have been constructed in the D1 protein of the cyanobacterium Syneclzocystis sp PCC 6803. All were expected to induce a significant conformational change in the Q,-binding region of photosystem I1 (PSII). Although the des-Ala263, Ser264-D1 mutant accumulated some D1 protein in the thylakoid membrane it was unable to grow photoautotrophically or evolve oxygen. Thermoluminescence and chlorophyll fluorescence studies confirmed that this deletion mutant did not show any functional PSII activity. In contrast, [S264P]DI was able to grow photoautotrophically and give light-saturated rates of oxygen evolution at 60% of the rate of the wild-type control strain, TC31. The A263P missense mutant was also able to evolve oxygen at 50% of TC31 rates although it did not readily grow photoautotrophically. Thermoluminescence, flash oxygen yield and chlorophyll fluorescence measurements indicated that in both missense mutants electron transfer from QA to QU was significantly impaired in dark adapted cells. However, QA to QH electron transfer could be photoactivated in the mutants by background illumination. Both the A263P and S264P mutants also showed an increase in resistance to the s-triazine family of herbicides although this feature did not hold for the phenolic herbicide, ioxynil. Of particular interest was that the two missense mutants, especially S264P, possessed a slower rate of turnover of the D1 protein compared with TC31 and in vivo contained detectable levels of a 41-kDa adduct consisting of D1 and the a subunit of cytochrotne b,,,. When protein synthesis was blocked by the addition of lincomycin, D1 degradation was again slower in S264P than TC31. The results are discussed in terms of structural changes in the Q,-binding region which affect herbicide and plastoquinone binding and perturb the normal regulatory factors that control the degradation of the D1 protein and its synchronisation with the synthesis of a replacement D1 protein. K~~w o K~s :photosystem 11; D1 turnover; mutagenesis ; herbicide binding; quinone.The photosystem two (PSII) complex of oxygenic photosynthesis is a water-plastoquinone oxidoreductase. The reducing side of the complex shares many functional and structural similarities to the photosynthetic reaction centre complex found in purple non-sulphur photosynthetic bacteria (Michel and Deisenhofer, 1988). Electron transfer in both types of reaction-centres proceeds through a two-gate electronic mechanism whereby a bound quinone, Q,,, acts as a one-electron carrier which reduces a second quinone bound at the QR site. Following two turnovers of the reaction centre, Q, is doubly reduced, becomes protonated and leaves the reaction centre as the quinol to be replaced by a quinone molecule from the lipid bilayer. The D1 and D2 polypeptides form the PSII reaction centre and are considered to contain the QR and QA binding sites, respectively (Nanba and Satoh, 1987;Michel and Deisenhofer, 1988). In addition the D1 protein is th...

show abstract

Comparative thermoluminescence study of triazine-resistant and -susceptible biotypes of Erigeron canadensis L

Cited by 48 publications

References 25 publications

An Application of Thermoluminescence to Herbicide Studies

An Application of Thermoluminescence to Herbicide Studies

High resolution emission spectra of one second delayed fluorescence from chloroplasts

Reduced Turnover of the D1 Polypeptide and Photoactivation of Electron Transfer in Novel Herbicide Resistant Mutants ofSynechocystissp. PCC 6803

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