Literature DB >> 24186788

Glutamine-synthetase isoforms appearing in sunflower cotyledons during germination : Effects of light and nitrate.

P de la Haba1, P Cabello, J M Maldonado.   

Abstract

Ion-exchange chromatography has been used to separate the isoforms of glutamine synthetase (GS; EC 6.3.1.2) appearing in sunflower (Helianthus annuus L. cv. Peredovic) cotyledons during seedling growth under different light and nitrogen conditions. Both in dry and imbibed seeds, only a single form of GS (GSs) was detected. Upon seed germination, the GSs isoform was gradually replaced by cytosolic (GS1) and plastidic (GS2) isoforms. Light and nitrate decreased the levels of GS1. In contrast, the appearance of GS2 was greatly stimulated by light. Nitrate also had a positive effect, particularly in the light. Light and nitrate acted synergistically on the appearance of GS2. The GS2:GS1 ratio in cotyledons of 9-d-old seedlings ranged from about 2, in darkness and nitrate-deprivation conditions, to 16 under light and nitrate application. The possible physiological roles of the distinct GS isoforms appearing in the epigeal cotyledons of sunflower during germination, and their differential regulation by light and nitrate, are discussed.

Entities:  

Year:  1992        PMID： 24186788     DOI： 10.1007/BF00198038

Source DB:  PubMed          Journal:  Planta        ISSN： 0032-0935            Impact factor:   4.116


  13 in total

1.  Evidence for a cytosolic-dependent light induction of chloroplastic glutamine synthetase during greening of etiolated rice leaves.

Authors:  B Hirel; J Vidal; P Gadal
Journal:  Planta       Date:  1982-06       Impact factor: 4.116

2.  Signal storage in phytochrome action on nitrate-mediated induction of nitrate and nitrite reductases in mustard seedling cotyledons.

Authors:  C Schuster; R Oelmüller; H Mohr
Journal:  Planta       Date:  1987-05       Impact factor: 4.116

3.  Glutamine synthetase oligomers and isoforms in sugarbeet (Beta vulgaris L.).

Authors:  G Mäck; R Tischner
Journal:  Planta       Date:  1990-04       Impact factor: 4.116

4.  Factors involved in the coordinate appearance of nitrite reductase and glutamine synthetase in the mustard (Sinapis alba L.) seedling.

Authors:  M Weber; S Schmidt; C Schuster; H Mohr
Journal:  Planta       Date:  1990-02       Impact factor: 4.116

5.  Barley mutants lacking chloroplast glutamine synthetase-biochemical and genetic analysis.

Authors:  R M Wallsgrove; J C Turner; N P Hall; A C Kendall; S W Bright
Journal:  Plant Physiol       Date:  1987-01       Impact factor: 8.340

6.  Glutamine Synthetases of Higher Plants : Evidence for a Specific Isoform Content Related to Their Possible Physiological Role and Their Compartmentation within the Leaf.

Authors:  S F McNally; B Hirel; P Gadal; A F Mann; G R Stewart
Journal:  Plant Physiol       Date:  1983-05       Impact factor: 8.340

7.  Regulation of the appearance of glutamine synthetase in mustard (Sinapis alba L.) cotyledons by light, nitrate and ammonium.

Authors:  S Schmidt; H Mohr
Journal:  Planta       Date:  1989-04       Impact factor: 4.116

8.  Phytochrome-mediated activation of the gene for cytosolic glutamine-synthetase (GS1) during imbibition of photosensitive lettuce seeds.

Authors:  A Sakamoto; G Takeba; D Shibata; K Tanaka
Journal:  Plant Mol Biol       Date:  1990-08       Impact factor: 4.076

9.  Chloroplast and cytosolic glutamine synthetase are encoded by homologous nuclear genes which are differentially expressed in vivo.

Authors:  S V Tingey; F Y Tsai; J W Edwards; E L Walker; G M Coruzzi
Journal:  J Biol Chem       Date:  1988-07-15       Impact factor: 5.157

10.  Development of nitrogen-assimilating enzymes in sunflower cotyledons during germination as affected by the exogenous nitrogen source.

Authors:  P de la Haba; E Agüera; J M Maldonado
Journal:  Planta       Date:  1988-01       Impact factor: 4.116
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  2 in total

1.  Genetic and physiological analysis of germination efficiency in maize in relation to nitrogen metabolism reveals the importance of cytosolic glutamine synthetase.

Authors:  Anis M Limami; Clothilde Rouillon; Gaëlle Glevarec; André Gallais; Bertrand Hirel
Journal:  Plant Physiol       Date:  2002-12       Impact factor: 8.340

2.  Boron deficiency decreases plasmalemma H+-ATPase expression and nitrate uptake, and promotes ammonium assimilation into asparagine in tobacco roots.

Authors:  Juan J Camacho-Cristóbal; Agustín González-Fontes
Journal:  Planta       Date:  2007-03-03       Impact factor: 4.540
  2 in total

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