| | 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 | |
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