1989
DOI: 10.1111/j.1399-3054.1989.tb05988.x
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Different effects of supplied ammonium on glutamine synthetase activity in mustard (Sinapis alba) and pine (Pinus sylvestris) seedlings

Abstract: H. 1989. Different effects of supplied ammonium on glutamine synthetase aetivity in mustard (Sitiapis alba) and pine {Pinus sytvestris) seedlings. -Physiol. Plant. 77: 129-135.The activity of glutamine synthetase (GS) in mustard (Sinapis alba L.) and Scots pine (Pintis sylvestris L.) seedlings was used as an index to evaluate the capacity to cope with excessive ammonium supply. In these 2 speeies GS aetivity was differently affected by the application of nitrogen compounds (NH| or NOj). Mustard seedlings older… Show more

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Cited by 19 publications
(7 citation statements)
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“…However, with 2,5 and 25 mM (NH4)2SO4 growth media, the concentration of NHj in the stems was comparable to that in the roots and needles. The results are consistent with the ammonium concentrations found in maize (Lee and Ratcliffe 1991) and pine needles (Vollbrecht et al, 1989), However, one interesting feature of the 'H-coupled '•'NHJ is the unusual line shape. Normally the 'H-coupled '"NHJ resonances from tissue are quite broad, but otherwise featureless peaks, but our spectra exhibited structure in the peaks, partictilarly with spectTa obtained from needles.…”
Section: Discussionsupporting
confidence: 87%
“…However, with 2,5 and 25 mM (NH4)2SO4 growth media, the concentration of NHj in the stems was comparable to that in the roots and needles. The results are consistent with the ammonium concentrations found in maize (Lee and Ratcliffe 1991) and pine needles (Vollbrecht et al, 1989), However, one interesting feature of the 'H-coupled '•'NHJ is the unusual line shape. Normally the 'H-coupled '"NHJ resonances from tissue are quite broad, but otherwise featureless peaks, but our spectra exhibited structure in the peaks, partictilarly with spectTa obtained from needles.…”
Section: Discussionsupporting
confidence: 87%
“…The roots and leaves of NH 4 + -prefered conifers always contain a high amount of glutamine synthetase (GS) and glutamate synthetase (GOGAT) which transform free NH 4 + into glutamic acid, and some species are found to have high level of glutamate dehydrogenase (GDH) activity which directly synthesizes NH 4 + into glutamic acid (Srivastata and Singht, 1987;Vézina et al, 1988;Vollbrecht et al, 1989;Knoepp et al, 1993). After the uptake of a large amount of NH 4 + into plants, these enzymes can immediately transform NH 4 + into amino acids and avoid the harm brought by excessive NH 4 + .…”
Section: Nitrogen Assimilating Enzymesmentioning
confidence: 99%
“…High NH 4 + deposition has also been implicated in the decline of some forests of red spruce, although this tree is considered to be highly adapted to NH 4 + as an N source (Holldampf and Barker 1993). Substantial variations in NH 4 + tolerance can also be seen amongst closely-related species (Monselise and Kost 1993), within species (Feng and Barker a, Magalhaes et al 1995, Schortemeyer et al 1997, and at different developmental stages (Vollbrecht et al 1989). Such differences, as well as differences in experimental systems (for instance, NH 4 + concentrations, pH regimes, supply of other nutrients, light intensity, temperature, and standards of comparison in terms of growth on other N sources and choice of contrasting species), have led to some apparent contradictions in the literature (compare, for instance, van den Driessche 1971 and Krajina et al 1973, for conifers).…”
Section: Species Response Gradientsmentioning
confidence: 99%