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1984 (1)
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1975 (1)
1Author    A. Trebst, H. WietoskaRequires cookie*
 Title    Hemmung des photosynthetischen Elektronentransports von Chloroplasten durch Metribuzin * Mode of Action and Structure-Acitivity-Relationships of the Aminotriazinone Herbicide Metribuzin Inhibition of Photosynthetic Electron Transport in 'Chloroplasts by M etribuzin  
 Abstract    The influence of the aminotriazinone herbicide Metribuzin on photosynthetic reactions of iso­ lated chloroplasts is investigated. Metribuzin inhibits all Hill-reactions when water is the electron donor, but not photoreductions by photosystem I at the expense of an artificial electron donor. The PIso-value is 6.7. Cyclic photophosphorylation is not affected by Metribuzin. Measurements of the prompt and delayed fluorescence of the photosynthetically active chlorophyll support the notion, that Metribuzin inhibits photosynthetic electron flow between the primary and secondary electron acceptor of photosystem II (Q and plastoquinone). The relationship of inhibitory potency to chemical structure is investigated by comparing a number of related aminotriazinones. The effect of various substituents is discussed. E in le itu n g 
  Reference    (Z. Naturforsch. 30c, 499 [1975]; eingegangen am 7. April 1975) 
  Published    1975 
  Keywords    Photosynthesis, Chloroplasts, Herbicide, Metribuzin, Aminotriazinone 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0499.pdf 
 Identifier    ZNC-1975-30c-0499 
 Volume    30 
2Author    KntonK. HatziosRequires cookie*
 Title    Use o f Isolated L ea f Cells o f A butilon theophrasti to Localize the Action o f Two Aminotriazinone Herbicidal Derivatives  
 Abstract    The effects o f the aminotriazinone herbicides metribuzin [4-amino-6-/er/-butyl-3-(methylthio)-l,2,4,-triazin-5(4H)one] and metamitron [4-amino-3-methyl-6-phenyl-l,2,4-triazin-5(4H)-one] on the metabolism o f enzymatically isolated leaf cells o f Abutilon theophrasti Medic, were examined. Photosynthesis, protein, ribonucleic acid (R N A), and lipid synthesis were assayed by the in­ corporation o f radioactive substrates such as N aH 14C 0 3, [14C]leucine, [14C]uracil, and [14C]acetate, respectively, into the isolated cells. Photosynthesis was the most sensitive process inhibited by both herbicides, but metribuzin was a more potent inhibitor than metamitron. Protein synthesis was not affected by any herbicide. R N A synthesis was inhibited significantly by both herbicides and may be involved in their ultimate herbicidal action. Lipid synthesis was inhibited signifi­ cantly only by the high concentrations o f metribuzin, and it was not affected by any concentration o f metamitron at any incubation time. Inhibition o f lipid synthesis may be involved in the action o f metribuzin as a herbicide. 
  Reference    Z. Naturforsch. 37c, 276—281 (1982); received October 8 December 71981 
  Published    1982 
  Keywords    Abutilon theophrasti, Metabolism o f Isolated Leaf Cells, Metribuzin, Metamitron, Herbicidal Ac­ tion, Inhibition 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0276.pdf 
 Identifier    ZNC-1982-37c-0276 
 Volume    37 
3Author    N. Pucheu, W. Oettmeier, U. H. Eisterkam, K. Masson, G.F W IldnerRequires cookie*
 Title    Metribuzin-Resistant Mutants of Chlamydomonas reinhardii  
 Abstract    Herbicide resistance in Chlamydomonas reinhardii cells was induced by m utagenesis with 5-fluorodeoxyuridine and ethylm ethanesulfonate. Four m utant strains were isolated and analyzed for resistance against D C M U -type or phenolic inhibitors o f photosynthetic electron transport. The mutants were different in both the extent and the pattern o f their resistance: the R / S value, i.e. the ratio o f / 50 values o f the inhibition o f photosynthetic electron transport in isolated resistant and susceptible thylakoids, varied for m etribuzin from 10 000 to 36. The mutant MZ-1 was resistant against metribuzin, atrazine and D C M U , whereas the mutant M Z-2 showed resistance mainly against metribuzin and atrazine. The m utant M Z-3 was sim ilar to MZ-1, but showed a lesser extent o f resistance against D C M U . The m utant M Z-4 show ed resistance against metribuzin, but not against atrazine. These results dem onstrate that the resistance against one herbicide o f the D C M U -type (m etribuzin) must not be accom panied by sim ilar resistance against te other inhibitors. Binding studies with radioactively labeled herbicides, [l4C]metribuzin, [HC]atrazine and [3H]DCM U, and isolated thylakoids supported these observations. Phosphorylation o f thylakoid m embrane proteins was studied with w ild-type cells and resistant mutants under in vivo conditions in the light. The 32P-labeled m ain proteins bands were in the molecular weight range o f 1 0 -1 4 kDa, 2 6 -2 9 kD a, 3 2 -3 5 kD a and 4 6 -4 8 kDa. The pattern and the extent o f incorporation o f 32P were sim ilar for the m utants and the w ild-type cells. 
  Reference    Z. Naturforsch. 39c, 437—439 (1984); received N ovem ber 30 1983 
  Published    1984 
  Keywords    Metribuzin, Chlamydomonas reinhardii, Q B-Protein, H erbicide R esistance, Thylakoid Phosphorylation 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0437.pdf 
 Identifier    ZNC-1984-39c-0437 
 Volume    39