ZfN: Search Results

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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	TEI-XML for	default:Reihe_C/38/ZNC-1983-38c-0730.pdf
	Identifier	ZNC-1983-38c-0730
	Volume	38

2	Author	Herman Clijsters, Ann Cuypers, Jaco Vangronsveld	Requires cookie*
	Title	Physiological Responses to Heavy Metals in Higher Plants; Defence against Oxidative Stress
	Abstract	Depending on the physiological process investigated heavy metal phytotoxicity can be either inhibitory or stimulatory. Photosynthesis and its partial light and dark reactions are inhibited; the activity of various enzymes, located in several cell compartiments, is increased. These enzymes are mostly induced since metals affect the transcription activity. They appear to be related to the plant defence against oxidative stress caused by metal phytotoxicity. Careful examination of the time course of this induction reveals differences in response between the metals applied.
	Reference	Z. Naturforsch. 54c, 730—7 (1999); received November 22 1998/April 10 1999
	Published	1999
	Keywords	Heavy Metals, Photosynthesis, Enzyme Induction, Oxidative Stress, Plant Defence Mechanisms
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	TEI-XML for	default:Reihe_C/54/ZNC-1999-54c-0730.pdf
	Identifier	ZNC-1999-54c-0730
	Volume	54

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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	TEI-XML for	default:Reihe_C/40/ZNC-1985-40c-0170.pdf
	Identifier	ZNC-1985-40c-0170
	Volume	40