title: [Different NaCl-dependence of the circadian CO2-gas-exchange of some halophil growing coastal plants].
abstract: CO2-exchange, diurnal changes in malate- and ion concentrations of the halophytes Carpobrotus edulis, Crithmum maritimum, Mesembryanthemum nodiflorum, Salicornia fruticosa, Suaeda maritima, and Trifolium fragiferum were investigated after culture at different NaCl concentrations. In Carp. edulis and Mes. nodiflorum the diurnal rhythm of CO2-exchange is in accordance with that of crassulacean acid metabolism (CAM), in Sal. fruticosa, Crithm. maritimum, Suaeda maritima, and Trif. fragiferum with that of Benson-Calvin metabolism (C3). Malate concentration and CO2uptake in the sap latter group are not influenced. On the other hand, Carp. edulis and Mes. nodiflorum show an accumulation of malate during the night, which can be interpreted as a further indication of CAM.The two species most resistant to NaCl, Carp. edulis and Sal. fruticosa, greatly differ very much in their NaCl content. NaCl concentration in Salicornia is four times higher than in Carpobrotus.The different metabolic properties studied might be of ecological importance for the plants in their natural habitats. The effect of NaCl on metabolic processes is discussed.
authors.affiliation: Fachbereich Biologie-Botanik der Technischen Hochschule Darmstadt, Darmstadt, Deutschland.
authors.forename: Siegfried
authors.initials: S
authors.lastname: Treichel
authors.affiliation: Fachbereich Biologie-Botanik der Technischen Hochschule Darmstadt, Darmstadt, Deutschland.
authors.forename: Peter
authors.initials: P
authors.lastname: Bauer