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Pagina 1 a partire dal 104 risultati
Synthesis of glutamine and glutamate by intact bundle-sheath cells of maize (Zea mays L.).
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Intact bundle-sheath cells with functional plasmodesmata were isolated from leaves of Zea mays L. cv. Mutin, and the capacity of these cells to synthesize glutamine and glutamate was determined by simulating physiological substrate concentrations in the bathing medium. The results show that
Purification and Characterization of Two Forms of Glutamine Synthetase from the Pedicel Region of Maize (Zea mays L.) Kernels.
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Maize (Zea mays L.) kernel pedicels, including vascular tissues, pedicel parenchyma, placento-chalazal tissue, and the surrounding pericarp, contained two forms of glutamine synthetase (EC 6.3.1.2), separable by anion exchange chromatography under mildly acidic conditions. The earlier-eluting
Glutamine Synthetase and Ferredoxin-Dependent Glutamate Synthase Expression in the Maize (Zea mays) Root Primary Response to Nitrate (Evidence for an Organ-Specific Response).
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To define further the early, or primary, events that occur in maize (Zea mays) seedlings exposed to NO3-, accumulation of chloroplast glutamine synthetase (GS2; EC 6.3.1.2) and ferredoxin-dependent glutamate synthase (Fd-GOGAT; EC 1.4.7.1), transcripts were examined in roots and leaves. In roots,
Glutamine synthetase activity in leaves of Zea mays L. as influenced by magnesium status.
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CONCLUSIONS
The total capacity of the GS-mediated ligation of free ammonium and glutamate to form glutamine in the leaves of maize plants is not impaired upon severe magnesium starvation. Magnesium deficiency does not obligatorily lead to the decreased total protein concentrations in the leaves.
Effect of post-silking drought on nitrogen partitioning and gene expression patterns of glutamine synthetase and asparagine synthetase in two maize (Zea mays L.) varieties.
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Glutamine synthetase (GS) and asparagine synthetase (AS) are proposed to have important function in plant nitrogen (N) remobilization, but their roles under drought stress are not well defined. In this study, the expression dynamics of GS and AS genes were analyzed in two maize varieties (ZD958 and
Transcriptional activation of Igl, the gene for indole formation in Zea mays: a structure-activity study with elicitor-active N-acyl glutamines from insects.
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The indole-3-glycerol phosphate lyase Igl is the structural gene of volatile indole biosynthesis in the tritrophic interaction in maize. The gene is activated on transcriptional level with the same kinetics and to the same level by the fatty acid-amino acid conjugates (FAC's) volicitin
Differential expression of six glutamine synthetase genes in Zea mays.
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The maize genome has been shown to contain six glutamine synthetase (GS) genes with at least four different expression patterns. Noncoding 3' gene-specific probes were constructed from all six GS cDNA clones and used to examine transcript levels in selected organs by RNA gel blot hybridization
Distribution of the glutamine synthetase isozyme GSp1 in maize (Zea mays).
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In maize (Zea mays L.), GSp1, the predominant GS isozyme of the developing kernel, is abundant in the pedicel and pericarp, but absent from the endosperm and embryo. Determinations of GSp1 tissue distribution in vegetative tissues have been limited thus far to root and leaves, where the isozyme is
An integrated "omics" approach to the characterization of maize (Zea mays L.) mutants deficient in the expression of two genes encoding cytosolic glutamine synthetase.
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BACKGROUND
To identify the key elements controlling grain production in maize, it is essential to have an integrated view of the responses to alterations in the main steps of nitrogen assimilation by modification of gene expression. Two maize mutant lines (gln1.3 and gln1.4), deficient in two genes
Regulation of Nitrate Reductase during Early Seedling Growth (A Role for Asparagine and Glutamine).
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Growth systems that either permit (wet system) or prevent (dry system) the hydrolysis of endosperm reserves in maize (Zea mays) seedlings were developed to study the effect of endosperm reserves on the acquisition of external nitrogen. Three-day-old seedlings treated with 5 mM KNO3 for 24 h had
Glutamine synthetase and glutamate dehydrogenase isoforms in maize leaves: localization, relative proportion and their role in ammonium assimilation or nitrogen transport.
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Mesophyll cells (MCs) and bundle-sheath cells (BSCs) of leaves of the C4 plant maize (Zea mays L.) were separated by cellulase digestion to determine the relative proportion of the glutamine synthetase (GS; EC 6.3.1.2) or the NADH-glutamate dehydrogenase (GDH; EC 1.4.1.2) isoforms in each cell type.
Nitrogen Assimilation in the Highly Salt- and Boron-Tolerant Ecotype Zea mays L. Amylacea.
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The Lluta Valley in Northern Chile is an important agricultural area affected by both salinity and boron (B) toxicity. Zea mays L. amylacea, an ecotype arisen because of the seed selection practiced in this valley, shows a high tolerance to salt and B levels. In the present study the
Studies of Root Function in Zea mays: III. Xylem Sap Composition at Maximum Root Pressure Provides Evidence of Active Transport into the Xylem and a Measurement of the Reflection Coefficient of the Root.
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The cut ends of excised Zea mays roots were sealed to a pressure transducer and their root pressures recorded. These rose approximately hyperbolically to a maximum value of 4.21 +/- 0.34 bar after 30 to 40 minutes. Xylem exudate could not be collected at this pressure since the flow rate was zero.
Glutamine Induces the N-Dependent Accumulation of mRNAs Encoding Phosphoenolpyruvate Carboxylase and Carbonic Anhydrase in Detached Maize Leaf Tissue.
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We have used detached leaves to study the N-dependent control of expression of phosphoenolpyruvate carboxylase (PEPC) and carbonic anhydrase (CA) genes in maize (Zea mays L. cv Golden Cross Bantam T51). Following supplementation with an N-source and zeatin, PEPC and CA mRNA levels increased in
Immunolocalization of a Unique Form of Maize Kernel Glutamine Synthetase Using a Monoclonal Antibody.
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The pedicel (basal maternal tissue) of maize (Zea mays L.) kernels contains a physically and kinetically unique form of glutamine synthetase (GSp1) that is involved in the conversion of transport forms of nitrogen into glutamine for uptake by the developing endosperm (M.J. Muhitch [1989] Plant
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