| 1 | Author
| Joachim Leube, Hans Grisebach | Requires cookie* | | Title
| Further Studies on Induction of Enzymes of Phytoalexin Synthesis in Soybean and Cultured Soybean Cells  | | | Abstract
| The glucan elicitor from cell walls o f the fungal pathogen, Phytophthora m egasperm a f. sp. glycinea, caused a decrease in activity o f 3-hydroxy-3-m ethylglutaryl coenzym e A reductase in wounded soybean cotyledons, whereas wounding alone led to an increase in the activity o f this enzyme. A decrease o f HM G -CoA reductase activity after elicitor treatment was also found in soybean hypocotyls and soybean cell cultures. In contrast to the activity o f H M G -CoA reductase, the activity o f dim ethylallylpyrophosphate: 3,6a,9-trihydroxypterocarpan dimethylallyltransferase increases after elicitor challenge o f soy bean cell cultures and after inoculation o f soybean hypocotyls (cv A m so y 7 1) with m ycelium o f either race 1 (incom patible) or race 3 (com patible) o f P. megasperma. | | |
Reference
| Z. Naturforsch. 38c, 730 (1983); received June 23 1983 | | |
Published
| 1983 | | |
Keywords
| Phytoalexins, Soybean, Soybean Cell Cultures, Enzyme-Induction | | |
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| default:Reihe_C/38/ZNC-1983-38c-0730.pdf | | | Identifier
| ZNC-1983-38c-0730 | | | Volume
| 38 | |
3 | Author
| A. P. Singh, J. B. Singh | Requires cookie* | | Title
| Regulation of ß-Galactosidase Synthesis in Wild Type and in a Succinate-Resistant Mutant of Rhizobium meliloti  | | | Abstract
| The synthesis o f /?-galactosidase in Rhizobium m eliloti W U 60 was found to be inducible by lactose and its non-m etabolizable analogue, isopropyl-ß-D-thiogalactoside (IPTG). In contrast to Escherichia coli, galactose and m elibiose were very weak inducers o f this enzyme in R. meliloti. The maximum level o f /3-galactosidase in this bacterium is 2% o f that in fully induced E. coli. In addition to glucose, the induced synthesis o f this enzyme in R. m eliloti was repressed by galactose, glycerol, and succinate. In comparison to E. coli, addition o f cyclic AMP to the growth medium o f R. m eliloti did not alleviate the repressive effect o f the above com pounds on ß-galactosidase synthesis. High concentrations o f sodium succinate (100 m M) were inhibitory to the growth o f R. meliloti. Spontaneous succinate-resistant mutants could be isolated at low frequency. In contrast to the wild type parent, in a succinate-resistant mutant, the synthesis o f /J-galactosidase was not repressed by succinate. | | |
Reference
| Z. Naturforsch. 40c, 170—175 (1985); received October 3 1984 | | |
Published
| 1985 | | |
Keywords
| /3-Galactosidase, Rhizobium meliloti, Enzyme Induction, Catabolite Repression, Succinate-Resistant Mutant | | |
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| default:Reihe_C/40/ZNC-1985-40c-0170.pdf | | | Identifier
| ZNC-1985-40c-0170 | | | Volume
| 40 | |
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