| 1 | Author
| D. Urbach, M. Suchanka, W. Urbach | Requires 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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| default:Reihe_C/31/ZNC-1976-31c-0652.pdf | | | Identifier
| ZNC-1976-31c-0652 | | | Volume
| 31 | |
2 | Author
| PeterM. Bramley, IanE. Clarke, K., Gerhard Sandmann, Peter Böger | Requires 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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| default:Reihe_C/39/ZNC-1984-39c-0460.pdf | | | Identifier
| ZNC-1984-39c-0460 | | | Volume
| 39 | |
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