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cDNA sequence and differential expression of the gene encoding the glutamine synthetase γ polypeptide ofPhaseolus vulgaris L.

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Abstract

We report the sequence of an essentially full-length glutamine synthetase (GS) cDNA clone (pcGS-γ1) isolated from a root nodule library ofPhaseolus vulgaris L. The polypeptide encoded by this cDNA has been producedin vitro by transcription/translation and shown to co-migrate on two-dimensional gels with the previously identified major cytosolic GS polypeptide (γ) of nodules. Two previously identified GS cDNA clones, pR-2 and pR-1 (see Gebhardtet al., EMBO J 5: 1429–1435, 1986) have similarly been shown to encode the α and β cytosolic GS polypeptides respectively. An RNase protection technique has been used to analyse specifically and quantitatively the abundance of mRNA related to these three GS cDNAs and to the cDNA (pcGS-δ1) encoding the chloroplast-located GS, during nodulation. Differences in the abundances of these mRNAs at different times suggest that they are not coordinately regulated. Moreover, using this technique mRNA specifically related to pcGS-γ1 was found at high levels in nodules but not in roots or leaves. Surprisingly the expression of this gene is not nodule-specific as previously suggested, as its mRNA was also detected, but at lower levels, in stems, petioles and in green cotyledons. By comparison, mRNA related to a leghaemoglobin gene was detected only in nodules. Comparisons of the relative abundances of the pcGS-γ1 mRNA and the γ polypeptide in different organs and at different stages during nodulation, suggest that the appearance of the γ polypeptide is largely under transcriptional control.

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Author notes

  1. David A. Lightfoot

    Present address: Department of Biological Sciences, University of Warwick, CV4 7AL, Coventry, UK

Authors and Affiliations

  1. Department of Horticulture, Oregon State University, 97331, Corvallis, OR, USA

    Malcolm J. Bennett, David A. Lightfoot & Julie V. Cullimore

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  2. David A. Lightfoot
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Bennett, M.J., Lightfoot, D.A. & Cullimore, J.V. cDNA sequence and differential expression of the gene encoding the glutamine synthetase γ polypeptide ofPhaseolus vulgaris L.. Plant Mol Biol 12, 553–565 (1989). https://doi.org/10.1007/BF00036969

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  • DOI: https://doi.org/10.1007/BF00036969

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