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'Carotenoid Biosynthesis' in keywords
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1984 (1)
1976 (1)
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    PeterM. Bramley, IanE. Clarke, K., Gerhard Sandmann, Peter BögerRequires cookie*
 Title    Inhibition of Carotene Biosynthesis in Cell Extracts of Phycomyces blakesleeanus  
 Abstract    Cell extracts o f the C l 15 (^-carotene-accum ulating) strain o f Phycom yces blakesleeanus were incubated with either [2-l4C]MVA or [1-I4C]IPP and a range o f possible inhibitors o f caro-tenogenesis, including bleaching herbicides, biphenyl com pounds and geranylacetone. Several o f these compounds were potent inhibitors o f /7-carotene form ation and caused the accum ulation o f phytoene. N o other carotenes were found to accum ulate, in vitro. The structures o f these inhibi­ tors, compared to that o f phytoene, suggest that they affect the enzym ic activity o f "phytoene dehydrogenase", possibly by com petitive inhibition. 
  Reference    Z. Naturforsch. 39c, 460—463 (1984); received N ovem ber 1 1983 
  Published    1984 
  Keywords    Carotenoid Biosynthesis, Bleaching Herbicides, Inhibitors o f Phytoene Desaturation, Phycomyces blakesleeanus, Cell Extracts 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0460.pdf 
 Identifier    ZNC-1984-39c-0460 
 Volume    39