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Expression of the bacterial gdhA gene encoding a NADPH glutamate dehydrogenase in tobacco affects plant growth and development

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Abstract

We investigated the effects of genetic modification of nitrogen metabolism via the bacterial glutamate dehydrogenase (GDH) on plant growth and metabolism. The gdhA gene from Escherichia coli encoding a NADPH-GDH was expressed in tobacco plants under the control of the 35 S promoter. The specific activity of GDH in gdhA plants was 8-fold of that in E. coli. Damage caused by spray application of 1.35 mM of phosphinothricin (PPT) herbicide, a glutamine synthetase (GS) inhibitor, was less pronounced in gdhA plants as compared with the control plants which suggests that the introduced GDH can assimilate some of the excess ammonium, at least during GS inhibition. However, gdhA plants were susceptible to 2.7 mM PPT. Biomass production was consistently increased in gdhA transgenic plants grown under controlled conditions and in the field. Total free amino acids and total carbohydrates were increased in gdhA plants grown in the greenhouse suggesting that both nitrogen and carbon metabolism were altered. We conclude that the modifications in transgenic plants may result from both increased nitrogen efficiency and altered gene expression and metabolism.

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Authors
  1. Rafiqa Ameziane
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  2. Karen Bernhard
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  3. David Lightfoot
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Ameziane, R., Bernhard, K. & Lightfoot, D. Expression of the bacterial gdhA gene encoding a NADPH glutamate dehydrogenase in tobacco affects plant growth and development. Plant and Soil 221, 47–57 (2000). https://doi.org/10.1023/A:1004794000267

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