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'H erbicides' in keywords Facet   section ZfN Section C  [X]
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1986 (1)
1984 (2)
1979 (3)
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    J.J S Van RensenRequires cookie*
 Title    Interaction of Photosystem II Herbicides with Bicarbonate and Formate in Their Effects on Photosynthetic Electron Flow  
 Abstract    The reactivation o f the Hill reaction in C 0 2-depleted broken chloroplasts by various concen­ trations o f bicarbonate was measured in the absence and in the presence o f photosystem II herbicides. It appears that these herbicides decrease the apparent affinity o f the thylakoid membrane for bicarbonate. Different characteristics o f bicarbonate binding were observed in chloroplasts o f triazine-resistant Amaranthus hybridus com pared to the triazine-sensitive biotype. It is concluded that photosystem II herbicides, bicarbonate and formate interact with each other in their binding to the Q B-protein and their interference with photosynthetic electron transport. 
  Reference    Z. Naturforsch. 39c, 374—377 (1984); received N ovem ber 15 1983 
  Published    1984 
  Keywords    Photosynthesis, Electron Transport, H erbicides, Bicarbonate, Formate 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0374.pdf 
 Identifier    ZNC-1984-39c-0374 
 Volume    39 
3Author    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 
4Author    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 
5Author    JohnE. Hearst, Kenneth SauerRequires cookie*
 Title    Protein Sequence Homologies between Portions of the L and M Subunits of Reaction Centers of Rhodopseudomonas capsulata and the QB-Protein of Chloroplast Thylakoid Membranes: a Proposed Relation to Quinone-Binding Sites  
 Abstract    Department o f Chemistry, U niversity o f California and D ivision o f C hem ical Biodynam ics, Sequence hom ology has been found between the L and M subunits o f Rhodopseudom onas capsulata reaction centers and the Q B-protein from all species thus far sequenced. The hom ology between the L subunit and the Q B-protein is contained in the sequence P F H M L GA M H G -L V -S and is believed to have survived three billion years o f evolution. A m odel is presented which associates quinone binding with this 
  Reference    Z. Naturforsch. 39c, 421 (1984); received D ecem ber 6 1983 
  Published    1984 
  Keywords    32 Kilodalton Protein, Sem iquinone Anion Stabilization, H erbicides, Photosynthesis 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0421.pdf 
 Identifier    ZNC-1984-39c-0421 
 Volume    39 
6Author    Christof Niehrs, Jan AhlersRequires cookie*
 Title    Pentachlorophenol Inhibits Photosynthetic Electron Flow and Quenches Chlorophyll Fluorescence after Preillumination  
 Abstract    The pesticide PCP was shown to inhibit the Hill reaction in broken chloroplasts (I50 = 15 jam) and to quench chlorophyll fluorescence. Both effects require preillum ination. In contrast to the com m on "phenol-type" inhibitors, neither inhibition o f Hill reaction nor chlorophyll fluorescence quench were affected by pretreatm ent of chloroplast with trypsin instead o f preillum ination. An inhibition site differing from the "phenol type" inhibitors is therefore assum ed. The results presented indicate that the observed light requirem ent is due to electron transport through PS II. M easurem ents of intrinsic tryptophane fluorescence phobic environment. 
  Reference    Z. Naturforsch. 41c, 433 (1986); received N ovem ber 4 1985 
  Published    1986 
  Keywords    Photosynthesis, Pentachlorophenol, Chlorophyll F luorescence, H erbicides, Trypsin Treatment 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0433.pdf 
 Identifier    ZNC-1986-41c-0433 
 Volume    41