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Página 1 a partir de 88 resultados
Rapid Induction of Ion Pulses in Tomato, Cucumber, and Maize Plants following a Foliar Application of L(+)-Adenosine.
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Application of picomole quantities of (+)-adenosine, a plant growth-regulating second messenger elicited by triacontanol, to tomato (Lycopersicon esculentum Mill.), maize (Zea mays L.), and cucumber (Cucumis sativa L.) foliage, increased Ca2+, Mg2+, and K+ concentrations in the exudate from the
Control of nitrate and nitrite assimilation by carbohydrate reserves, adenosine nucleotides and pyridine nucleotides in leaves of Zea mays L. under dark conditions.
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The rate of in-vivo nitrate reduction by leaf segments of Zea mays L. was found to decline during the second hour of dark anaerobic treatment. On transfer to oxygen the capacity to reduce nitrate under dark conditions was restored. These observations led to the proposal that nitrate reductase is a
Structural relatedness of three ion-transport adenosine triphosphatases around their active sites of phosphorylation.
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Three membrane-bound adenosine triphosphatases were investigated for homology in the sequence of four amino acids about the active site of phosphorylation. The ATPases were as follows: sodium-potassium-dependent ATPase from dog kidney, Na,K-ATPase; hydrogen-potassium-dependent ATPase from hog
Identification and quantitation of adenosine-3':5'-cyclic monophosphate in plants using gas chromatography-mass spectrometry and high-performance liquid chromatography.
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Direct evidence has been obtained for the presence of adenosine-3':5'-cyclic monophosphate (cAMP) in tobacco (Nicotiana tabacum L.) callus tissue cultures, bean (Phaseolus vulgaris L.) seedlings and immature kernels of sweet corn (Zea mays L.) through the use of a highly specific and sensitive gas
Effect of dietary lipid on collagen- and adenosine diphosphate-induced platelet aggregation and thromboxane A2 synthesis in the rat.
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Dietary lipids containing different proportions of long-chain polyunsaturated fatty acids can affect platelet thromboxane A(2) formation and aggregation. In the present work, the effects of dietary lipid, from animal and vegetable sources, on collagen- and adenosine diphosphate (ADP)-induced
Purification and characterization of adenosine diphosphate glucose pyrophosphorylase from maize/potato mosaics.
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Adenosine diphosphate glucose pyrophosphorylase (AGPase) catalyzes a rate-limiting step in starch biosynthesis. The reaction produces ADP-glucose and pyrophosphate from glucose-1-P and ATP. Investigations from a number of laboratories have shown that alterations in allosteric properties as well as
Purification and properties of adenosine diphosphoglucose pyrophosphorylase from sweet corn.
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A 40-fold purification of adenosine diphosphoglucose pyrophosphorylase from sweet corn (Zea mays var. Golden Beauty) revealed the enzyme to be specific for adenosine triphosphate. The enzyme has an absolute requirement for Mg(2+) and is activated by 3-phosphoglycerate and to a lesser extent by
Evidence against the occurrence of adenosine-3':5'-cyclic monophosphate in higher plants.
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Previous reports on the incorporation of [(14)C]adenine into adenosine-3':5'-cyclic monophosphate (cyclic AMP) in oat (Avena sativa L.) and maize (Zea mays L.) coleoptile sections, chick-pea (Cicer arietinum L.) embryos and barley (Hordeum vulgare L.) aleurone layers were reexamined. Separation of
Measurement of Metabolites Associated with Nonaqueously Isolated Starch Granules from Immature Zea mays L. Endosperm.
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Starch granules with associated metabolites were isolated from immature Zea mays L. endosperm by a nonaqueous procedure using glycerol and 3-chloro-1,2-propanediol. The soluble extract of the granule preparation contained varying amounts of neutral sugars, inorganic phosphate, hexose and triose
Regulation of Assimilatory Sulfate Reduction by Cadmium in Zea mays L.
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Plants cultivated with Cd can produce large amounts of phytochelatins. Since these compounds contain much cysteine, these plants should have an increased rate of assimilatory sulfate reduction, the biosynthetic pathway leading to cysteine. To test this prediction, the effect of Cd on growth, sulfate
Regulation of Assimilatory Sulfate Reduction by Herbicide Safeners in Zea mays L.
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Effects of the herbicide safeners N,N-diallyl-2,2-dichloroacetamide and 4-dichloroacetyl-3,4-dihydro-3-methyl-2H-1,4-benzooxazin (CGA 154281) on the contents in cysteine and glutathione, on the assimilation of (35)SO(4) (2-), and on the enzymes of assimilatory sulfate reduction were analyzed in
Inhibition of the adenosine-5'-phosphosulfate-sulfotransferase activity from spinach, maize, and Chlorella by adenosine-5'-monophosphate.
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Adenosin-5'-phosphosulfate (APS) sulfotransferase from higher plants and algae seems to be regulated by adenosine-5'-monophosphate, an endproduct of the APS-sulfotransferase reaction. This was found in crude extracts of Spinacea oleracea L. and Zea mays L. and with partially purified
Increased Membrane-bound Adenosine Triphosphatase Activity Accompanying Development of Enhanced Solute Uptake in Washed Corn Root Tissue.
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Washing of excised corn (Zea mays L., variety WF9xM14) root tissue is accompanied by an increase in (Mg(2+) + K(+))-stimulated adenosine triphosphatase. This is the adenosine triphosphatase described by Fisher, Hansen, and Hodges as positively correlated with ion accumulation rates. The increase in
Characterization of small interfering RNAs derived from Sugarcane mosaic virus in infected maize plants by deep sequencing.
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RNA silencing is a conserved surveillance mechanism against viruses in plants. It is mediated by Dicer-like (DCL) proteins producing small interfering RNAs (siRNAs), which guide specific Argonaute (AGO)-containing complexes to inactivate viral genomes and may promote the silencing of host mRNAs. In
Intercellular Localization of Assimilatory Sulfate Reduction in Leaves of Zea mays and Triticum aestivum.
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The intercellular distribution of assimilatory sulfate reduction enzymes between mesophyll and bundle sheath cells was analyzed in maize (Zea mays L.) and wheat (Triticum aestivum L.) leaves. In maize, a C(4) plant, 96 to 100% of adenosine 5'-phosphosulfate sulfotransferase and 92 to 100% of ATP
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