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1999 (1)
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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    HartmutB. Stegmann, Paul Schuler, Stefan Westphal, Edgar WagnerRequires cookie*
 Title    Oxidative Stress of Crops Monitored by EPR  
 Abstract    Treatm ent of leaves of spinach, corn, and peas with the herbicides paraquat, am itrole or acifluorfen leads to oxidative stress resulting in a light driven drastically increased production of ascorbic acid radical (monodehydroascorbic acid, M DAA) which could be dem onstrated by in vivo EPR analysis. A discrimination of the M D A A form ation between the action of elec­ tron uncouplers and catalase inhibitors can be achieved by observation of the radical rise ki­ netics. Significant M DAA signal intensities are detected in the darkness likewise. These signals are probably due to the action of ascorbic acid oxidase activated by membrane destruction. 
  Reference    Z. Naturforsch. 48c, 766—772 (1993); received M arch 3/July 1 1993 
  Published    1993 
  Keywords    Herbicides, Paraquat, Amitrole, Ascorbic Acid Radicals 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0766.pdf 
 Identifier    ZNC-1993-48c-0766 
 Volume    48 
3Author    Jasmina Muraja-Ljubičić, Mercedes Wrischer, Nikola LjubešićRequires cookie*
 Title    Influence of the Herbicides Amitrole and Norflurazon on Greening of Illuminated Potato Microtubers  
 Abstract    Potato microtubers turn green within a few days when kept in the light. The initial phases in this process were observed as early as 12 hours after the onset of illumination. The changes included a pronounced increase in chlorophyll and carotenoid concentrations, accompanied by changes in the protein pattern and in the transformation of amyloplasts and leucoplasts to chloroplasts. The bleaching herbicides amitrole and norflurazon inhibited the synthesis of carotenoids in the illuminated potato microtubers. However, amitrole only delayed greening and an increase in chlorophyll and carotenoid levels became visible as late as four days after the onset of illumination, and the LHC II protein of the photosynthetic membrane was not detected before the seventh day of light exposure. Norflurazon, in contrast, acted as a stronger inhibitor, and microtuber tissues stayed yellowish throughout the experiment. The concentrations of both carotenoids and chlorophylls were very low in tissues treated with this herbicide. The LHC II protein could not be detected after a seven-day light exposure and the plastids were damaged, small in size, without normal thylakoids and with numer­ ous plastoglobules. 
  Reference    Z. Naturforsch. 54c, 333 (1999); received November 30 1998/January 21 1999 
  Published    1999 
  Keywords    Solanum tuberosum L cv Istra, Microtuber, Plastid, Amitrole, Norflurazon 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0333.pdf 
 Identifier    ZNC-1999-54c-0333 
 Volume    54