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Regulation of GmNRT2 expression and nitrate transport activity in roots of soybean (Glycine max).

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A full-length cDNA, GmNRT2, encoding a putative high-affinity nitrate transporter was isolated from a Glycine max (L.) root cDNA library and sequenced. The deduced GmNRT2 protein is 530 amino acids in length and contains 12 putative membrane-spanning domains and a long, hydrophilic C-terminal

Nitrate inhibition of N2 fixation and its effect on micronutrient accumulation in shoots of soybean (Glycine max L. Merr.), Bambara groundnut (Vigna subterranea L. Vedc) and Kersting's groundnut (Macrotyloma geocarpum Harms.).

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Although nitrate is known to inhibit nodulation and N2 fixation in symbiotic legumes, little is known about its effect on the uptake and accumulation of trace elements such as Fe, Zn, Mn and Cu. The aim of this study was to evaluate the effect of 5 mM NO3- supply, either with or without rhizobial

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,

Differences in photosynthetic behaviour and leaf senescence of soybean (Glycine max [L.] Merrill) dependent on N2 fixation or nitrate supply.

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Biological N(2) fixation can fulfil the N demand of legumes but may cost as much as 14% of current photosynthate. This photosynthate (C) sink strength would result in loss of productivity if rates of photosynthesis did not increase to compensate for the costs. We measured rates of leaf

Characterization of Anion Effects on the Nitrate-Sensitive ATP-Dependent Proton Pumping Activity of Soybean (Glycine max L.) Seedling Root Microsomes.

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The ATP-dependent proton-pumping activity of soybean (Glycine max L.) root microsomes is predominantly nitrate sensitive and presumably derived from the tonoplast. We used microsomes to characterize anion effects on proton pumping of the tonoplast vesicles using two distinctly different

Isolation and properties of soybean [Glycine max (L.) Merr.] mutants that nodulate in the presence of high nitrate concentrations.

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Soybean seeds [Glycine max (L.) Merr. ev. Bragg] were mutagenized with ethyl methanesulfonate. The M(2) progeny (i.e., the first generation after mutagenesis) of these seeds were screened for increased nodulation under high nitrate culture conditions. Fifteen independent nitrate-tolerant symbiotic

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

Nitrate Reduction by Roots of Soybean (Glycine max [L.] Merr.) Seedlings.

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Studies were conducted with 9 to 12 day-old soybean (Glycine max [L.] Merr. cv. Williams) seedlings to determine the contribution of roots to whole plant NO(3) (-) reduction. Using an in vivo -NO(3) (-) nitrate reductase (NR) assay (no exogenous NO(3) (-) added to incubation medium) developed for

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

Efficiency of Nitrogen Assimilation by N(2)-Fixing and Nitrate-Grown Soybean Plants (Glycine max [L.] Merr.).

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Nodulated and non-nodulated (not inoculated) soybeans (Glycine max [L.] Merr. cv Wells) were grown in controlled environments with N(2) or nonlimiting levels of NO(3) (-), respectively, serving as sole source of nitrogen. The efficiency of the N(2)-fixing plants was compared with that of the

[The influence of ammonium and nitrate of nutrient medium on ultrastructural organization and photosynthesis of callus cells in Glycine max L].

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We studied the influence of exogenic ammonium on the functional activity and ultrastructural organization of cells of the mixotrophic soybean callus (Glycine max L.). Ammonium available in the nutrient medium increased the chlorophyll content, accelerating the rate of photosynthetic O2 evolution per

Influence of Temperature on Nitrate Metabolism and Leaf Expansion in Soybean (Glycine max L. Merr.) Seedlings.

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The effect of various day temperatures on NADH-nitrate reductase, NADH- and NADPH-glutamate dehydrogenases, nitrate, protein and leaf area, measured at intervals during the ontogeny of the first trifoliolate soybean leaf, was determined. At 32.5 C and 25 C, nitrate concentration, nitrate reductase,

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