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Stranica 1 iz 456 rezultatima
Induction and Turnover of Nitrate Reductase in Zea mays (Influence of NO3-).
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Zea mays (cv W64A x W182E) was used to investigate the induction and turnover of nitrate reductase (NR). In our system, 5 or 10 mM KNO3 gave the best growth over a 6-d growing period. With these NO3- levels, NR reached steady-state levels after 24 h. For the turnover experiments, the seedlings were
Nitrate Reductase Activity in Maize (Zea mays L.) Leaves: II. Regulation by Nitrate Flux at Low Leaf Water Potential.
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Experiments were conducted to determine whether the nitrate flux to the leaves or the nitrate content of the leaves regulated the nitrate reductase activity (NRA) in leaves of intact maize (Zea mays L.) seedlings having low water potentials (psi(w)) when other environmental and endogenous factors
Characterization of two GL8 paralogs reveals that the 3-ketoacyl reductase component of fatty acid elongase is essential for maize (Zea mays L.) development.
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Prior analyses established that the maize (Zea mays L.) gl8a gene encodes 3-ketoacyl reductase, a component of the fatty acid elongase required for the biosynthesis of very long chain fatty acids (VLCFAs). A paralogous gene, gl8b, has been identified that is 96% identical to gl8a. The gl8a and gl8b
Distribution of the Mo-enzymes aldehyde oxidase, xanthine dehydrogenase and nitrate reductase in maize (Zea mays L.) nodal roots as affected by nitrogen and salinity.
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The distribution of the Mo-enzymes aldehyde oxidase (AO; EC 1.2.3.1) xanthine dehydrogenase (XDH; EC 1.2.1.37) and nitrate reductase (NAD(P)H NR; EC 1.6.6.1-2) was studied along the longitudinal and transversal axes of maize (Zea mays L. cv. Jubily) nodal roots as affected by nitrogen sources and
Induction and Turnover of Nitrate Reductase in Zea mays (Influence of Light).
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Both light and NO3- are necessary for the appearance of nitrate reductase (NR) activity (NRA) in photosynthetic tissues. To define the light effect more precisely, we examined the response to light/dark transitions on NRA, NR protein (NRP), and NR mRNA in 6-d-old maize (Zea mays cv W64A x W182E)
The nitrate reductase inhibitor, tungsten, disrupts actin microfilaments in Zea mays L.
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Tungsten is a widely used inhibitor of nitrate reductase, applied to diminish the nitric oxide levels in plants. It was recently shown that tungsten also has heavy metal attributes. Since information about the toxic effects of tungsten on actin is limited, and considering that actin microfilaments
A Comparison of Nitrite Reductase Enzymes from Green Leaves, Scutella, and Roots of Corn (Zea mays L.).
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Nitrite reductase from green leaves of corn (Zea mays L.) is eluted from a diethylaminoethyl-cellulose column in one peak of activity by a chloride gradient, while nitrite reductase from scutellum tissue is resolved into two peaks of activity, apparently representing two forms of the enzyme NiR1 and
Nitrate Reductase Activity in Maize (Zea mays L.) Leaves: I. Regulation by Nitrate Flux.
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The roles that leaf nitrate content and nitrate flux play in regulating the levels of nitrate reductase activity (NRA) were investigated in 8- to 14-day old maize (Zea mays L.) plants containing high nitrate levels while other environmental and endogenous factors were constant. The nitrate flux of
Molecular analysis of a second functional A1 gene (dihydroflavonol 4-reductase) in Zea mays.
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Some genes involved in anthocyanin biosynthesis in Zea mays are duplicated and differentially expressed. From the analysis of the A1 gene (dihydroflavonol 4-reductase), which is involved in this pathway, no molecular evidence for gene duplication was known to date. Isolation and analysis of A1
Structure and characterization of the gene encoding the ferredoxin-NADP reductase-binding protein from Zea mays L.
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A genomic clone encoding ferredoxin-NADP reductase binding protein (BP) from Zea mays L. was sequenced and characterized. The promoter region (692 bp) shows several motives resembling those involved in enhancement, tissue-specific expression and light regulation in plants, besides the typical TATA
Genomic analysis of the 12-oxo-phytodienoic acid reductase gene family of Zea mays.
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The 12-oxo-phytodienoic acid reductases (OPRs) are enzymes that catalyze the reduction of double bonds adjacent to an oxo group in alpha,beta-unsaturated aldehydes or ketones. Some of them have very high substrate specificity and are part of the octadecanoid pathway which convert linolenic acid to
Aldose reductase inhibitory activity of compounds from Zea mays L.
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Aldose reductase (AR) inhibitors have a considerable therapeutic potential against diabetes complications and do not increase the risk of hypoglycemia. Through bioassay-guided fractionation of an EtOH extract of the kernel from purple corn (Zea mays L.), 7 nonanthocyanin phenolic compounds (compound
Insect elicitors and exposure to green leafy volatiles differentially upregulate major octadecanoids and transcripts of 12-oxo phytodienoic acid reductases in Zea mays.
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The induction of jasmonic acid (JA) is one of the major signaling events in plants in response to insect herbivore damage and leads to the activation of direct and indirect defensive measures. Green leafy volatiles, which constitute a major portion of volatile organic compounds, often are released
Cloning and sequencing of a corn (Zea mays) nuclear gene coding for the chloroplast specific catalytic subunit of ferredoxin-thioredoxin reductase.
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We determined the complete nucleotide sequence of a cDNA clone encoding the smaller, catalytic subunit of ferredoxin-thioredoxin reductase from corn chloroplasts. The translated protein sequence, representing a subunit of 12.9 kDa shows 80% identity with the protein sequence from spinach and
Grain Protein Accumulation and the Relationship between Leaf Nitrate Reductase and Protease Activities during Grain Development in Maize (Zea mays L.): I. VARIATION BETWEEN GENOTYPES.
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Four maize hybrids, two with high and two with low levels of postanthesis nitrate reductase activity were grown under field conditions. The characteristic enzyme patterns had been established in previous work. Nitrate reductase and proteases were measured in three representative leaves (ear leaf,
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