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Fraunhofer-Institut für Atmosphärische Umweltforschung IFU
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PublicationMolecular approaches to glutathione biosynthesis( 1997)Rennenberg, H.The thiol tripeptide glutathione is synthesized in plants from the constituent amino acids in two enzyme catalyzed reaction steps. The properties and the regulation of both enzymes, namely gamma-glutamyl-cysteine synthetase (EC 6.3.2.2) and glutathione synthetase (EC 6.3.2.3), have been analyzed by classical biochemical studies and, recently, by plant molecular biology techniques. In the present review, the results achieved by these approaches are compared and a preliminary scheme for the regulation of cytosolic glutathione levels in plants is suggested with special emphasis on the interaction between the pathways of assimilatory sulphate reduction and glutathione biosynthesis.
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PublicationLong term effects of naturally elevated CO2, H2S and SO2 on sulphur allocation in Quercus( 1997)
;Schulte, M. ;Herschbach, C.Rennenberg, H.The thiol composition and contents were analysed in oak trees growing at sites with naturally elevated atmospheric CO2 and sulphur concentrations. Exposure to these gases leads to enhanced thiol contents in metabolically active tissues such as leaves and bark. In both tissues GSH was the predominant thiol. The additional reduced sulphur in leaves and bark seems to originate from atmospheric sulphur influx, since sulphur contents of the xylem sap remained unchanged. In contrast to xylem sap, GSH contents of phloem exudates decreased at elevated compared to ambient CO2 and sulphur independent of the site studied. Enhanced thiol contents in the bark, but reduced thiol contents in the phloem under elevated CO2 and sulphur indicate that reduced sulphur from atmospheric influx is partially stored in the bark and may not be allocated to the root. -
PublicationModelling and parameterization of chemical reactions in connection with fog events( 1997)
;Forkel, R. ;Ruggaber, A. ;Seidl, W.Dlugi, R. -
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PublicationThe chemical behaviour and deposition of ammonium nitrate, nitric acid and ammonia( 1997)
;Dlugi, R. ;Kins, L. ;Seiler, T. ;Seidl, W. ;Seifert, P. ;Kaspar, A. ;Sievering, H. ;Zelger, M. ;Köhler, E.Reusswig, K.