| | 41 | Author
| G.Erhard Sandm, R. Olf, Lam Bert, Peter Böger | Requires cookie* | | | Title
| Multifunctional Mode of Action of Substituted Nitrodiphenylethers in Scenedesmus Cells  | | | | Abstract
| Nitrodiphenylethers substituted with Cl, CF3, and other comparatively simple substituents are compared with respect to their primary effects on the photosynthetic apparatus. These are direct electron-transport inhibition, energy-transfer inhibition (of ATP synthesis), and pigment bleach ing, the latter accompanied by decrease o f electron transport activity. Certain substituents and their positions at the diphenylether skeleton can be correlated with a particular influence on these phytotoxic effects. The unicellular alga, Scenedesmus, is an appropriate species to fumisch quantitative data on these primary herbicidal modes of action within a 24-h assay period. | | | |
Reference
| Z. Naturforsch. 36c, 633 (1981); received March 311981 | | | |
Published
| 1981 | | | |
Keywords
| Nitrodiphenylethers, Energy-Transfer Inhibition of ATP Synthesis, Herbicides, Photosynthetic Electron Transport, Pigment Bleaching | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0633.pdf | | | | Identifier
| ZNC-1981-36c-0633 | | | | Volume
| 36 | |
| 42 | Author
| Zoltán Szigeti, Éva Sárvári, Endre Lehoczki | Requires cookie* | | | Title
| Chlorophyll Proteins and Lipids in Paraquat Treated Sensitive and Resistant Cony za Canadensis Leaves | | | | Abstract
| Photosynthetic activity and molecular com position o f thylakoid membranes o f sensitive and atrazine/paraquat coresistant biotypes o f Conyza canadensis (L.) Cronq was compared before and after 5 x 10~4 molar paraquat spraying. In contrast to the irreversibly damaged sensitive plants the Rfd values (vitality indices) calculated from parameters o f fluorescence induction curves, and the in vivo C 0 2 fixation in resistant plants showed -after a transitory inhibition -a recovery. Resistant thylakoids contained higher amount o f PS II and LHC II, (i.e. lower relative amount o f CP I) which can be the result o f an adaptation process. Fatty acid com position o f total leaf extract was almost the same in both biotype even after spraying. The amount o f the oligomeric form o f LHCP II decreased in paraquat treated sensitive thylakoids, which was in correlation with the reduction o f A3-transhexadecanoic acid content. Decrease in oligom eric LHCP II and/or special lipids (PG) in sensitive thylakoids may change the association o f LHCP II and photosystem II core as it is evidenced from lowering o f the M g2+ induced changes o f the short wavelength fluorescence intensity and increase in the relative quantum requirement values. The results are discussed in connection with a possible effect o f paraquat on PS II. | | | |
Reference
| Z. Naturforsch. 47c, 400 (1992); received January 20 1992 | | | |
Published
| 1992 | | | |
Keywords
| Paraquat/Atrazine Coresistance, Conyza canadensis, Chlorophyll-Protein Complexes, C hloro plast Lipids, Herbicides | | | |
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| default:Reihe_C/47/ZNC-1992-47c-0400.pdf | | | | Identifier
| ZNC-1992-47c-0400 | | | | Volume
| 47 | |
| 43 | Author
| KlausG. Tietjen, Wilfried Draber, John Goossens, JohannesR. Jansen, JoachimF. Kluth, Michael Schindler, Heinz-Jürgen, Wroblowsky Bayer, A. G. | Requires cookie* | | | Title
| Binding of Triazines and Triazinones in the QB-Binding Niche of Photosystem II | | | | Abstract
| A series o f 20 triazines (derivatives o f 2-alkylam ino-4-benzylam ino-6-chloro-l,3,5-triazines) and 37 triazinones (derivatives o f 3-alkyl-4-am ino-6-phenyl-l,2,4-triazin-5-ones) is tested for inhibitory potency in photosynthetic electron flow through photosystem II o f wild type Chla-mydomonas reinhardtii and o f five mutants with aminoacid substitutions in the D 1 protein at valine 219, alanine 251, phenylalanine 255, serine 264, and leucine 275. The data are used for computer modelling o f .the possible location o f the com pounds within a three dimensional model o f the QB-binding niche o f the D 1 protein. | | | |
Reference
| Z. Naturforsch. 48c, 205 (1993); received November 23 1992 | | | |
Published
| 1993 | | | |
Keywords
| D 1 Protein, Herbicides, Molecular M odeling, Photosystem II, Q B-Binding Niche | | | |
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| default:Reihe_C/48/ZNC-1993-48c-0205.pdf | | | | Identifier
| ZNC-1993-48c-0205 | | | | Volume
| 48 | |
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