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'H erbicides' in keywords Facet   Publication Year 1979  [X]
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1Author    J.J S Van Rensen, J. H. HobéRequires cookie*
 Title    Mechanism of Action of the Herbicide 4,6-Dinitro-o-cresol in Photosynthesis  
 Abstract    The herbicide 4,6-dinitro-o-cresol inhibits electron transport to ferricyanide and non-cyclic photophosphorylation for 50% at about 15 /am. At higher concentrations the photosystem I depen­ dent M ehler reaction ascorbate/dichlorophenolindophenol to m ethyl viologen is stim ulated, while cyclic photophosphorylation is inhibited. The herbicide thus is an inhibitory uncoupler. A lthough the chemical structure of 4,6-dinitro-o-cresol is different from th a t of the diuron-type herbicides, its site and mechanism of action is similar. Both 4,6-dinitro-o-cresol and diuron inhibit electron transport between the prim ary electron acceptor of Photosystem II and the plastoquinone pool. This causes a closing of the reaction centers of Photosystem II. The interaction with the inhibited molecule however is different for the two herbicides. 
  Reference    Z. Naturforsch. 34c, 1021 (1979); received May 26 1979 
  Published    1979 
  Keywords    Photosynthesis, Electron Transport, Photophosphorylation, H erbicides 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1021.pdf 
 Identifier    ZNC-1979-34c-1021 
 Volume    34 
2Author    BrunoW. Urzer, B. A. Sf, A. KtiengesellschaftRequires cookie*
 Title    Interpretation of Plant Growth Responses to Chemicals  
 Abstract    W hile searching for chem ical com pounds with herbicidal or growth regulating activities the researcher gladly notices if intact plants respond to the treatments at all. By means of colour slides, which unfortunately could not be printed here, changes in plant growth and leaf colour induced by chem icals were dem onstrated as they usually occur in an industrial screening operation. The range of sym ptom s shown in the presentation included sim ple lethal necrosis, "bleaching", increased generation of anthocyans, deterioration of the plant tissue, control of axillary buds, the prevention of resprouting, stunting of the shoots, and epinasties. Chem ical com pounds synthesised in the BA SF laboratories and com m ercial products were applied. 
  Reference    Z. Naturforsch. 34c, 931 (1979); received June 5 1979 
  Published    1979 
  Keywords    Plant Growth R esponse, H erbicides, Growth Regulators, Indicator Plants, Interactions 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0931.pdf 
 Identifier    ZNC-1979-34c-0931 
 Volume    34 
3Author    Carl FedtkeRequires cookie*
 Title    Plant Physiological Adaptations Induced by Low Rates of Photosynthesis  
 Abstract    A m ong the adaptory responses of plants to different ecological conditions the adaptation to low lig h t in tensities is one of the m ost im portant. This response, known as "shade adaptation", may, however, be sim ilarly induced by decreasing the rate of photosynthesis in other ways. The partial inhibition of photosynthetic electron flow with herbicides has clearly been shown to induce shade-type plants; in the case of photosynthetic lim itation by decreased C 0 2-availability only certain aspects of the shade-type m etabolism — namely the changes occurring in the nitrogen m etabolism — have been demonstrated. 
  Reference    Z. Naturforsch. 34c, 932 (1979); received May 5 1979 
  Published    1979 
  Keywords    Shade Adaptation, N itrogen M etabolism, H erbicides, Photosynthesis Inhibitors 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0932.pdf 
 Identifier    ZNC-1979-34c-0932 
 Volume    34