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Identification of several soybean cytosolic glutamine synthetase transcripts highly or specifically expressed in nodules: expression studies using one of the corresponding genes in transgenic Lotus corniculatus

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Abstract

A DNA fragment containing sequences hybridizing to the 5′ region of GS15, a gene encoding soybean cytosolic glutamine synthetase, was isolated from a soybean genomic library. Mapping and partial sequence analysis of the genomic clone revealed that it encodes a cytosolic GS gene, GS21, which is different from GS15.

In parallel, a number of cDNA clones encoding cytosolic GS were isolated using the coding region of pGS20 as a probe (pGS20 is a cDNA clone which corresponds to a transcript of the GS15 gene). Two new full-length cDNAs designated pGS34 and pGS38 were isolated and sequenced.

In the 5′ non-coding region a strong homology was found between the two clones and the GS21 gene. However, none of these sequences were identical, which suggests that there are at least three members in this group of genes.

In order to determine their relative levels of transcription, specific sequences from pGS34, pGS38 and GS21 were used in an RNAse protection assay. This experiment clearly showed that GS21 and the gene encoding pGS38 are specifically expressed in young or mature nodules, whereas the gene encoding pGS34 is highly transcribed in nodules and constitutively expressed at a lower level in other soybean organs.

In order to further analyse the molecular mechanisms controlling GS21 transcription, different fragments of the promoter region were fused to the Escherichia coli reporter gene encoding β-glucuronidase (GUS) and the constructs were introduced into Lotus corniculatus via Agrobacterium rhizogenes-mediated transformation. Analysis of GUS activity showed that the GS21 promoter-GUS constructs were expressed in the vasculature of all vegetative organs. This result is discussed in relation to species-specific metabolic and developmental characteristics of soybean and Lotus.

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  1. Guilhem Debrosses

    Present address: Biochimie et Physiologie Végétales, INRA, 2, Place Viala, F-34060, Montpellier Cedex 1, France

Authors and Affiliations

  1. Laboratoire du Métabolisme et de la Nutrition des Plantes, INRA, Centre de Versailles, Route de St Cyr, F-78026, Versailles Cedex, France

    Marie-Claude Marsolier, Guilhem Debrosses & Bertrand Hirel

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Marsolier, MC., Debrosses, G. & Hirel, B. Identification of several soybean cytosolic glutamine synthetase transcripts highly or specifically expressed in nodules: expression studies using one of the corresponding genes in transgenic Lotus corniculatus . Plant Mol Biol 27, 1–15 (1995). https://doi.org/10.1007/BF00019174

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  • DOI: https://doi.org/10.1007/BF00019174

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