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'Herbicides' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    Bernd Schneider, Manfred Stock, Gernot Schneider, HorstRobert Schütte, Klaus Schreiber, Angela Brauner, ErnstUlrich KaußmannRequires cookie*
 Title    Metabolism of Amitrole in Apple: I. Soluble Metabolites from Mature Fruits  
 Abstract    Mature fruits from apple trees contain residual amounts of radiolabel derived from soil-ap-plied [3,5-14C]amitrole. This report deals with characterization of the soluble part of this radio­ activity. By GC/MS of suitable derivatives 3-(l,2,4-triazol-l-yl)-2-aminopropionic acid was identi­ fied as a new metabolite of amitrole. Significant parts of radiolabel were incorporated into genuine plant products, indicating liberation of 14C 0 2 from the applied substance followed by reassimilation. Possible pathways of metabolism of amitrole within the system soil/apple tree are discussed. 
  Reference    Z. Naturforsch. 47c, 120—125 (1992); received June 18/October 24 1991 
  Published    1992 
  Keywords    Herbicide, Amitrole, Metabolism, Reassimilation, Structural Elucidation 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0120.pdf 
 Identifier    ZNC-1992-47c-0120 
 Volume    47 
2Author    A. Aiach, U. Bodner, U. JohanningmRequires cookie*
 Title    A Herbicide Resistant Euglena Mutant Carrying a Ser to Thr Substitution at Position 265 in the D 1 Protein of Photosystem II  
 Abstract    A herbicide resistant Euglena mutant (M SI) has been obtained by adapting wild type cells to increasing concentrations o f D C M U (3-(3',4'-dichlorophenyl)-l ,1-dimethylurea). Lower re­ sistance levels towards D C M U and metribuzin were observed in MSI when compared with Euglena or C hlam ydom onas mutants with Ser 264 to Ala substitutions. RNA-sequence analysis identified a Ser to Thr change at position 265 (equivalent to position 264 in other organisms), thus making it possible to compare the influence o f amino acids Ser, Ala and Thr at identical positions on the inhibitory effect o f structurally different herbicides in the same species. 
  Reference    Z. Naturforsch. 47c, 245 (1992); received October 31 1991 
  Published    1992 
  Keywords    Herbicides, D 1-Protein, Point M utation, Resistance, Euglena 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0245.pdf 
 Identifier    ZNC-1992-47c-0245 
 Volume    47 
3Author    R. Jockers, R. D. SchmidRequires cookie*
 Title    Synthesis of Long-Chain Triazine Aldehydes -Substrates of Bacterial Luciferase and Photosynthetic Inhibitors  
 Abstract    S-triazines are photosynthetic inhibitors. They have been substituted with co-aminoundeca-noic acid. The coupling products have been transformed into triazine aldehydes. These com ­ pounds displace radioactive terbutryn and have inhibitory effects on photosynthesis in plants and bacteria. Triazine aldehydes were shown to be effective substrates for bacterial luciferase. A competitive assay between photosystem-II-herbicides and aldehyde-labeled triazines is dis­ cussed. 
  Reference    Z. Naturforsch. 47c, 573—5 (1992); received April 7/June 15 1992 
  Published    1992 
  Keywords    Herbicides, Bacterial Luciferase, Triazines, Aldehyde, Photosystem II, Biosensor 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0573.pdf 
 Identifier    ZNC-1992-47c-0573 
 Volume    47 
4Author    Barbara Schaller, Bernd Schneider, HorstRobert SchütteRequires cookie*
 Title    Metabolism of the Herbicide Bromoxynil in Hordeum vulgare and Stellaria media  
 Abstract    The metabolism of [3,5-14C]3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) was studied in Hordeum vulgare and Stellaria media. In excised barley seedlings the time course of metabolism was followed over 48 h and the distribution of radioactivity to various metabolic fractions measured. The metabolites, sepa­ rated by TLC and HPLC, were identified by chemical and spectrometric methods. Bromo-hydroquinone and 2,6-dibromohydroquinone were found, indicating partly debromination and replacement of the nitrile group by hydroxyl. The major parts of bromoxynil and of the metabolites were recovered in glucosidic conjugates. In Stellaria media the same metabolites as in Hordeum vulgare were determined. Additional­ ly, metabolites of unknown structures without bromine were detected. 
  Reference    Z. Naturforsch. 47c, 126—131 (1992); received June 18/August 21 1991 
  Published    1992 
  Keywords    Herbicide, Bromoxynil, Metabolites, Structural Elucidation, Hordeum vulgare, Stellaria media 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0126.pdf 
 Identifier    ZNC-1992-47c-0126 
 Volume    47 
5Author    Zoltán Szigeti, Éva Sárvári, Endre LehoczkiRequires cookie*
 Title    Chlorophyll Proteins and Lipids in Paraquat Treated Sensitive and Resistant Cony za Canadensis Leaves  
 Abstract    Photosynthetic activity and molecular com position o f thylakoid membranes o f sensitive and atrazine/paraquat coresistant biotypes o f Conyza canadensis (L.) Cronq was compared before and after 5 x 10~4 molar paraquat spraying. In contrast to the irreversibly damaged sensitive plants the Rfd values (vitality indices) calculated from parameters o f fluorescence induction curves, and the in vivo C 0 2 fixation in resistant plants showed -after a transitory inhibition -a recovery. Resistant thylakoids contained higher amount o f PS II and LHC II, (i.e. lower relative amount o f CP I) which can be the result o f an adaptation process. Fatty acid com position o f total leaf extract was almost the same in both biotype even after spraying. The amount o f the oligomeric form o f LHCP II decreased in paraquat treated sensitive thylakoids, which was in correlation with the reduction o f A3-transhexadecanoic acid content. Decrease in oligom eric LHCP II and/or special lipids (PG) in sensitive thylakoids may change the association o f LHCP II and photosystem II core as it is evidenced from lowering o f the M g2+ induced changes o f the short wavelength fluorescence intensity and increase in the relative quantum requirement values. The results are discussed in connection with a possible effect o f paraquat on PS II. 
  Reference    Z. Naturforsch. 47c, 400 (1992); received January 20 1992 
  Published    1992 
  Keywords    Paraquat/Atrazine Coresistance, Conyza canadensis, Chlorophyll-Protein Complexes, C hloro­ plast Lipids, Herbicides 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0400.pdf 
 Identifier    ZNC-1992-47c-0400 
 Volume    47