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'Pyridazinone' in keywords
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1Author    D. Urbach, M. Suchanka, W. UrbachRequires cookie*
 Title    Effect of Substituted Pyridazinone Herbicides and of Difunone (EMD-IT 5914) on Carotenoid Biosynthesis in Green Algae  
 Abstract    The carotenoid biosynthesis of the green alga A n kistrodesm u s braunii is blocked if these cells are cultured in presence of sublethal doses of pyridazinone herbicides (San 9789, San 6706, BASF 44521) or of the herbicide difunone (EMD-IT 5914). The amount of colored carotenoids normally found in these algae is reduced drastically and the precursors phytoene and phytofluene are ac­ cumulated. Furthermore a decrease in the chlorophyll level occurs in the treated cells, but there is a stronger loss of chlorophyll a, resulting in a lowering of the chlorophyll a/b ratio with time. Concerning the activity of substituted pyridazinones leading to inhibition of carotenoid biosynthesis this effect can be related to the chemical structure of these compounds: a trifluoromethyl substitu­ tion of the phenyl ring an d a mono-or dimethyl substitution of the amine (San 9789, San 6706) or a methoxy group instead of the substituted amine (BASF 44521) are required both for this effect. Other pyridazinone derivatives with eith er a trifluoromethyl substitution of the phenyl ring (San 9774) or a dimethyl substitution of the amine (San 9785) or a methoxy group (BASF 13761) are without any effect on the pigment pattern of these algae. 
  Reference    (Z. Naturforsch. 31c, 652 [1976]; received July 28 1976) 
  Published    1976 
  Keywords    Herbicides, Pyridazinone, Difunone, Carotenoid Biosynthesis, Green Algae 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0652.pdf 
 Identifier    ZNC-1976-31c-0652 
 Volume    31 
2Author    H. K. Lichtenthaler, H. K. KleudgenRequires cookie*
 Title    Effect of the Herbicide San 6706 on Biosynthesis of Photosynthetic Pigments and Prenylquinones in Raphanus and in Hordeum Seedlings  
 Abstract    The pyridazinone herbicide San 6706 blocks chlorophyll and carotenoid formation simultaneously in a correlated way in both Raphanus and Hordeum seedlings. With decreasing carotenoid content the carotenoid precursor phytoene appears in San 6706-treated plants. The accumulation of the chloroplast prenylquinones (plastoquinone-9, a-tocopherol, <x-toco-quinone and vitamin Kj) is much less affected. This indicates that the biosynthesis of C20-and C45-prenyl chains (geranyl-geraniol, phytol and solanesol) which are incorporated in prenylquinones is not blocked by San 6706. It is assumed that the block of chlorophyll and carotenoid formation is due to one basic inhibi­ tion mechanism. The possibility that San 6706 may interfere with chloroplast ribosome formation, is discussed. 
  Reference    (Z. Naturforsch. 32c, 236 [1977]; received December 13 1976) 
  Published    1977 
  Keywords    Herbicide, Pyridazinone, Prenyl Biosynthesis, Carotenoids, Prenylquinones 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0236.pdf 
 Identifier    ZNC-1977-32c-0236 
 Volume    32 
3Author    JosefA. Graf, RetoJ. Strasser, Ulrich KuliRequires cookie*
 Title    Structure-Function-Relationship in Thylakoids Influenced by the Pyridazinone BAS 13—338 (SAN 9785)  
 Abstract    The pyridazinone B A S 13 — 338 (S A N 9785) inhibits the desaturation sequence leading to polyunsaturated fatty acids, mainly o f glycolipids. Parallel to the inhibition of fatty acid desatura­ tion in the presence o f the pyridazinone, changes in energy-distribution parameters have been observed. These data indicate that the amount o f polyunsaturated fatty acids in glycolipids is strongly correlated with excitation, trapping, grouping and dissipation, but not with spillover. Functional changes in energy distribution induced by B A S 13—338 are interpreted as a conse­ quence of structural changes in the lipid matrix, which may imply a structure-function relationship betw een pigment protein com plexes and the surrounding lipid environm ent in thylakoids. 
  Reference    Z. Naturforsch. 42c, 808 (1987); received O ctober 31 1986 
  Published    1987 
  Keywords    Pyridazinone, Fatty Acid D esaturation, Energy Distribution, Structure-Function Relationship 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0808.pdf 
 Identifier    ZNC-1987-42c-0808 
 Volume    42 
4Author    ManojK. Joshia, PrasannaM. Ohantyb, Salil BoseaRequires cookie*
 Title    Inhibition of State Transition and Light-Harvesting Complex II Phosphorylation-Mediated Changes in Excitation Energy Distribution in the Thylakoids of SANDOZ 9785-Treated Plants  
 Abstract    Thylakoids isolated from SA N 9785 (4-chloro-5-dimethylamino-2-phenyl-3(2H)-pyridazi-none)-treated pea plants showed an inhibition of "state transition" and the light-harvesting complex II (LHC II) phosphorylation-mediated changes in the energy distribution between photosystem II (PS II) and photosystem I (PS I) as measured by a decrease in PS II and an increase in PS I fluorescence yield. Interestingly, in these thylakoids the extent o f phosphory-lation-induced migration o f light-harvesting complex (LHC II-P) to non-appressed m em ­ brane regions was only marginally inhibited. We propose that the suppression in the ability for "state transition" by S A N D O Z 9785 (SA N 9785) treatment occurs due to a lack o f effec­ tive coupling of the migrated LHC II-P and PS I. Since we observed a decrease in the antenna size of PS I of the treated plants, the lack of effective coupling is attributed to this decrease in the antenna size of PS I. 
  Reference    Z. Naturforsch. 50c, 77—8 (1995); received August 3/September 28 1994 
  Published    1995 
  Keywords    Pyridazinone, Photosystems, State Transition, LHC II Phosphorylation, Energy Redistribution 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0077.pdf 
 Identifier    ZNC-1995-50c-0077 
 Volume    50