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Página 1 a partir de 154 resultados
Functional Characterization of the Steroid Reductase Genes GmDET2a and GmDET2b form Glycine max.
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Brassinosteroids are important phytohormones for plant growth and development. In soybean (Glycine max), BR receptors have been identified, but the genes encoding BR biosynthesis-related enzymes remain poorly understood. Here, we found that the soybean genome encodes eight steroid reductases
Isolation, sequence identification and tissue expression profile of two novel soybean (glycine max) genes-vestitone reductase and chalcone reductase.
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The complete mRNA sequences of two soybean (glycine max) genes-vestitone reductase and chalcone reductase, were amplified using the rapid amplification of cDNA ends methods. The sequence analysis of these two genes revealed that soybean vestitone reductase gene encodes a protein of 327 amino acids
Cloning, nucleotide sequence and expression of the bifunctional dihydrofolate reductase-thymidylate synthase from Glycine max.
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cDNAs encoding the bifunctional dihydrofolate reductase-thymidylate synthase from Glycine max were isolated and sequenced. The 1794 base full length cDNA contains a single open reading frame of 1593 bases. The predicted size of the encoded protein is 530 amino acids with a molecular weight of
Nitrate Reductases from Wild-Type and nr(1)-Mutant Soybean (Glycine max [L.] Merr.) Leaves : II. Partial Activity, Inhibitor, and Complementation Analyses.
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Soybean (Glycine max [L.] Merr.) leaves have been shown to contain three forms of nitrate reductase (NR). Two of the forms, which are present in leaves of wild-type (cv. Williams) plants grown in the absence of NO(3) (-), are termed constitutive and designated c(1)NR and c(2)NR. The third form,
Isolation and Initial Characterization of Constitutive Nitrate Reductase-Deficient Mutants NR328 and NR345 of Soybean (Glycine max).
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Two nitrate reductase deficient mutants of soybean (Glycine max [L.] Merr. cv Bragg) were isolated from approximately 10,000 M(2) seedlings, using a direct enzymic assay in microtiter plates. Stable inheritance of NR345 and NR328 phenotypes has been demonstrated through to the M(5) generation. Both
Nitrate Reductases from Wild-Type and nr(1)-Mutant Soybean (Glycine max [L.] Merr.) Leaves : I. Purification, Kinetics, and Physical Properties.
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NADH:nitrate reductase (EC 1.6.6.1) and NAD(P)H:nitrate reductase (EC 1.6.6.2) were purified from wild-type soybean (Glycine max [L.] Merr., cv Williams) and nr(1)-mutant soybean plants. Purification included Blue Sepharose- and hydroxylapatite-column chromatography using acetone powders from fully
Nitrate Reductase Activity in Soybeans (Glycine max [L.] Merr.): I. Effects of Light and Temperature.
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The optimum in vivo nitrate reductase (NR) assay medium for soybean (Glycine max [L.] Merr.) leaves was 50 mm KNO(3), 1% (v/v) 1- propanol, and 100 mm potassium phosphate buffer (pH 7.5).Loss of in vivo NR activity from leaves of soybeans exposed to dark was fastest at 40 C and slowest at 20 C.
Nitrate Reductase Activity in Soybeans (Glycine max [L.] Merr.): II. Energy Limitations.
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Growth chamber studies with soybeans (Glycine max [L.] Merr.) were designed to determine the relative limitations of NO(3) (-), NADH, and nitrate reductase (NR) per se on nitrate metabolism as affected by light and temperature. Three NR enzyme assays (+NO(3) (-)in vivo, -NO(3) (-)in vivo, and in
Canopy and Seasonal Profiles of Nitrate Reductase in Soybeans (Glycine max L. Merr.).
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Nitrate reductase activity of soybeans (Glycine max L. Merr.) was evaluated in soil plots and outdoor hydroponic gravel culture systems throughout the growing season. Nitrate reductase profiles within the plant canopy were also established. Mean activity per gram fresh weight per hour of the entire
Evaluation of constitutive iron reductase (AtFRO2) expression on mineral accumulation and distribution in soybean (Glycine max. L).
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Iron is an important micronutrient in human and plant nutrition. Adequate iron nutrition during crop production is central for assuring appropriate iron concentrations in the harvestable organs, for human food or animal feed. The whole-plant movement of iron involves several processes, including the
Enzymic synthesis of lignin precursors. Comparison of cinnamoyl-CoA reductase and cinnamyl alcohol:NADP+ dehydrogenase from spruce (Picea abies L.) and soybean (Glycine max L.).
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Cambial sap of spruce (Picea abies) proved to be a good source for isolation of cinnamoyl-CoA reductase and cinnamyl alcohol:NADP+ dehydrogenase. Apparently homogeneous enzymes were obtained by a multistep procedure including dye-ligand chromatography and for the reductase also affinity
Overexpression of a GmCnx1 gene enhanced activity of nitrate reductase and aldehyde oxidase, and boosted mosaic virus resistance in soybean.
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Molybdenum cofactor (Moco) is required for the activities of Moco-dependant enzymes. Cofactor for nitrate reductase and xanthine dehydrogenase (Cnx1) is known to be involved in the biosynthesis of Moco in plants. In this work, a soybean (Glycine max L.) Cnx1 gene (GmCnx1) was transferred into
Glutathione reductase activity and chilling tolerance are induced by a hydroxylamine derivative BRX-156 in maize and soybean.
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The possible contribution of antioxidants in the improvement of stress tolerance induced by the hydroxylamine derivative BRX-156 was studied in two thermophilic crops, soybean (Glycine max (L.) Merr.) and maize (Zea mays L.) both during germination and at the seedling stage. The most effective
Deoxyribonucleotide synthesis and DNA polymerase activity in plant cells (Vicia faba and Glycine max).
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Enzymes of deoxyribonucleotide and DNA biosynthesis, which are little known in plants, were studied in root tips of germinating broad beans (Vicia faba) and in fast-growing cultures of soybean cells (Glycine max). The plant cells contain a ribonucleoside 5'-diphosphate reductase which is detected in
Analysis of a ferric leghemoglobin reductase from cowpea (Vigna unguiculata) root nodules.
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Ferric leghemoglobin reductase (FLbR), an enzyme reducing ferric leghemoglobin (Lb) to ferrous Lb, was purified from cowpea (Vigna unguiculata) root nodules by sequential chromatography on hydroxylapatite followed by Mono-Q HR5/5 FPLC and Sephacryl S-200 gel filtration. The purified cowpea FLbR had
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