Cited by 97Plant Stress Responses and TolerancePlant nutrient uptake and metabolismPolyamine Metabolism and Applications

Over-expression of a tomato N-acetyl-L-glutamate synthase gene (SlNAGS1) in Arabidopsis thaliana results in high ornithine levels and increased tolerance in salt and drought stresses

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Kalamaki, Mary S., Alexandrou, Dimitris, Lazari, Diamanto, Merkouropoulos, Georgios, Fotopoulos, Vasileios, Pateraki, Irene, Aggelis, Alexandros, Carrillo-López, Armando +2 more·2009·Journal of Experimental Botany

Abstract

A single copy of the N-acetyl-L-glutamate synthase gene (SlNAGS1) has been isolated from tomato. The deduced amino acid sequence consists of 604 amino acids and shows a high level of similarity to the predicted Arabidopsis NAGS1 and NAGS2 proteins. Furthermore, the N-terminus ArgB domain and the C-terminus ArgA domain found in SlNAGS1 are similar to the structural arrangements that have been reported for other predicted NAGS proteins. SlNAGS1 was expressed at high levels in all aerial organs, and at basic levels in seeds, whereas it was not detected at all in roots. SlNAGS1 transcript accumulation was noticed transiently in tomato fruit at the red-fruit stage. In addition, an increase of SlNAGS1 transcripts was detected in mature green tomato fruit within the first hour of exposure to low oxygen concentrations. Transgenic Arabidopsis plants have been generated expressing the SlNAGS1 gene under the control of the cauliflower mosaic virus (CaMV) 35S promoter. Three homozygous transgenic lines expressing the transgene (lines 1-7, 3-8, and 6-5) were evaluated further. All three transgenic lines showed a significant accumulation of ornithine in the leaves with line 3-8 exhibiting the highest concentration. The same lines demonstrated higher germination ability compared to wild-type (WT) plants when subjected to 250 mM NaCl. Similarly, mature plants of all three transgenic lines displayed a higher tolerance to salt and drought stress compared to WT plants. Under most experimental conditions, transgenic line 3-8 performed best, while the responses obtained from lines 1-7 and 6-5 depended on the applied stimulus. To our knowledge, this is the first plant NAGS gene to be isolated, characterized, and genetically modified.

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  • Better salt tolerance can be conferred through expression of glycinebetaine and polyamines in terrestrial plants.

    “better salt tolerance conferred through expression of glycinebetaine and polyamines in terrestrial plants [166,167]”

    From Biofuels from algae: Challenges and potential (2010) · cites this paper as [166]

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Authors
Kalamaki, M. S., Alexandrou, D., Lazari, D., Merkouropoulos, G., Fotopoulos, V., Pateraki, I., Aggelis, A., Carrillo-López, A., Rubio-Cabetas, M. J., & Kanellis, A. K.
Affiliations
Aristotle University of Thessaloniki (GR)
Corresponding author
Kanellis, Angelos K.
Venue
Journal of Experimental Botany
Published
2009-04
Volume
60
Issue
6
Pages
1859-1871
ISSN
  • 0022-0957 (ISSN-L)
  • 1460-2431
OpenAlex
W2115848425
Cited by
97
References
52
Citations by year
2026: 4 · 2025: 8 · 2024: 7 · 2023: 4 · 2022: 5 · 2021: 8 · 2020: 2 · 2019: 6 · 2018: 3 · 2017: 6 · 2016: 7 · 2015: 7 · 2014: 4 · 2013: 9 · 2012: 3
FWCI
6.87
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Journal of Experimental Botany (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Ktisis at Cyprus University of Technology (Cyprus University of Technology) (submittedVersion, cc-by-nc)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Polyamine Metabolism and Applications
Keywords
tomato, salt tolerance, drought tolerance, transgenic Arabidopsis, urea cycle
MeSH terms
Amino Acid Sequence, Molecular Sequence Data, Ornithine, Plant Proteins, Sodium Chloride, Gene Expression, Arabidopsis, Gene Expression Regulation, Plant, Solanum lycopersicum, Amino-Acid N-Acetyltransferase, Salt Tolerance, Droughts

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