| | 1 | Author
| I. Perewoska, C. Vernotte, M. Picaud, C. Astier | Requires cookie* | | | Title
| Mutations in the Subunit of Photosystem II and Resistance to the Phenol Type Herbicide Ioxynil in Synechocystis PCC 6714 and 6803  | | | | Abstract
| Several herbicides block the photosystem II electron transfer because they compete with QB, the second stable electron acceptor o f photosystem II for binding to the D, subunit. We have previously isolated a mutant o f Synechocystis 6714 in which Asn is replaced by Thr at position 266 o f D, (G. Ajlani, I. Meyer, C. Vernotte, and Astier, FEBS Lett. 246, 2 0 7 -2 1 0 (1989)) and presenting resistance to ioxynil but not to D C M U . In this report we present selection, from this mutant, o f a double mutant with an additional substitution at position 264 (Ser by Ala). The sensitivity o f this mutant toward several herbicides is given and compared to those o f the mutants having only one substitution at 266 and one substitution at 264. It was also compared to a mutant o f Chlamydomonas having the same substitutions. This allows us to discuss the interaction o f various herbicides with the D , protein and to compare the herbicide binding niches o f Chlamydomonas and Synechocystis. | | | |
Reference
| Z. Naturforsch. 47c, 580—5 (1992); received March 13 1992 | | | |
Published
| 1992 | | | |
Keywords
| Cyanobacteria, Chlamydomonas, Herbicide-Resistant M utants, Photosynthesis, Sequence Analysis | | | |
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| default:Reihe_C/47/ZNC-1992-47c-0580.pdf | | | | Identifier
| ZNC-1992-47c-0580 | | | | Volume
| 47 | |
| 2 | Author
| Alexander Pazur, Hugo Scheer | Requires cookie* | | | Title
| The Growth of Freshwater Green Algae in Weak Alternating Magnetic Fields of 7.8 Hz Frequency | | | | Abstract
| Liquid cultures o f Chlorella kessleri, Scenedesmus armatus and Chlamydomonas reinhardtii have been grown phototrophically in weak (0 .2 -2 G) alternating (7.8 Hz) magnetic fields. The data indicate, that the rate o f cell division is larger at 0.2 than at 2 G, viz. that the higher fields have inhibitory effects on cell division and that there is possibly an optimum at = 1 G. N o reli able effect is found on the pigment contents. | | | |
Reference
| Z. Naturforsch. 47c, 690—6 (1992); received April 13/July 7 1992 | | | |
Published
| 1992 | | | |
Keywords
| Earth M agnetic Field, Schumann Resonance, Chlorella, Scenedesmus, Chlamydomonas, Chlorophyll | | | |
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| default:Reihe_C/47/ZNC-1992-47c-0690.pdf | | | | Identifier
| ZNC-1992-47c-0690 | | | | Volume
| 47 | |
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