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Effects of the overexpression of a soybean cytosolic glutamine synthetase gene (GS15) linked to organ-specific promoters on growth and nitrogen accumulation of pea plants supplied with ammonium
- Source :
- Plant Physiology and Biochemistry, Plant Physiology and Biochemistry, Elsevier, 2006, 44 (10), pp.543-550. ⟨10.1016/j.plaphy.2006.09.007⟩
- Publication Year :
- 2005
-
Abstract
- A soybean cytosolic glutamine synthetase gene ( GS15 ) fused to a constitutive promoter (CaMV 35S), a putative nodule-specific promoter ( LBC 3 ), or a putative root-specific promoter ( rolD ) was transformed into Pisum sativum L. cv. Greenfeast. Four lines with single copies (Lines 1, 7, 8 and 9) and four lines with two copies each of GS15 (Lines 2, 4, 6 and 11) were compared to the wild-type (WT) parental line for levels of cytosolic glutamine synthetase (GS1), glutamine synthetase (GS) activity, N accumulation, N derived form the atmosphere (NDFA), and biomass of plants grown on 0.0, 0.1, 1.0 or 10.0 mM NH 4 + . Enhanced levels of GS1 were detected in leaves of one of the two lines transformed with the 35S-GS15 construct, and all three lines containing the rolD-GS15 construct. All three lines containing the LBC 3 -GS15 construct had increased levels of GS1 in nodules. Despite the increased levels of GS1 in many transformants, only the roots of lines containing the rolD-GS15 construct consistently demonstrated enhanced levels of GS activity (up to 12-fold). Positive responses in plant N content, NDFA, and biomass were rare, but increases in plant biomass and N content of up to 17% and 54%, respectively, occurred in some of the rolD-GS15 lines at certain levels of ammonium. In general, GS15 copy number did not seem to differentially affect phenotype of the transformants, and transformants respond to ammonium concentrations in similar patterns to that previously observed with nitrate. Despite the fact that the rolD-GS15 transformants consistently resulted in increased GS activity in roots and resulted in some occurrences of increases in biomass and plant N content, the lack of consistent positive growth effect across all transformants indicates that the generalized overexpression of GS1 in tissues holds little potential for positive growth responses in pea.
- Subjects :
- Physiology
Nitrogen
Plant Science
Gene Expression Regulation, Enzymologic
Pisum
chemistry.chemical_compound
Sativum
Cytosol
Gene Expression Regulation, Plant
Glutamate-Ammonia Ligase
Glutamine synthetase
Genetics
PISUM SATIVUM L
Ammonium
[SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology
TRANSGENIC PEA
Biomass
Promoter Regions, Genetic
Gene
chemistry.chemical_classification
biology
Dose-Response Relationship, Drug
Peas
food and beverages
Promoter
AMMONIUM
biology.organism_classification
Plants, Genetically Modified
Quaternary Ammonium Compounds
Enzyme
chemistry
Biochemistry
Organ Specificity
OVEREXPRESSION
Soybeans
GLUTAMINE SYNTHETASE
Subjects
Details
- ISSN :
- 09819428
- Volume :
- 44
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Plant physiology and biochemistry : PPB
- Accession number :
- edsair.doi.dedup.....ca2c334357fe7ccc708ca55c580608a8