Lupinus Albus L
Mostrando 37-48 de 52 artigos, teses e dissertações.
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37. Phosphorus deficiency in Lupinus albus. Altered lateral root development and enhanced expression of phosphoenolpyruvate carboxylase.
The development of clustered tertiary lateral roots (proteoid roots) and the expression of phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) in roots were studied in white lupin (Lupinus albus L.) grown with either 1 mM P (+P-treated) or without P (-P-treated). The +P-treated plants initiated fewer clustered tertiary meristems and the emergence of these me
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38. Phosphorus Stress-Induced Proteoid Roots Show Altered Metabolism in Lupinus albus.
Proteoid roots develop in Lupinus albus L. in response to nutrient stress, especially P. Proteoid roots excrete citrate and thus increase the availability of P, Fe, and Mn in the rhizosphere. In an effort to understand citrate synthesis and organic acid metabolism in proteoid roots of lupin, we have evaluated in vitro enzyme activities of citrate synthase (C
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39. Root Carbon Dioxide Fixation by Phosphorus-Deficient Lupinus albus (Contribution to Organic Acid Exudation by Proteoid Roots).
When white lupin (Lupinus albus L.) is subjected to P deficiency lateral root development is altered and densely clustered, tertiary lateral roots (proteoid roots) are initiated. These proteoid roots exude large amounts of citrate, which increases P solubilization. In the current study plants were grown with either 1 mM P (+P-treated) or without P (-P-treate
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40. Asparagine Metabolism—Key to the Nitrogen Nutrition of Developing Legume Seeds 1
Asparagine accounted for 50 to 70% of the nitrogen carried in translocatory channels serving fruit and seed of white lupin (Lupinus albus L.). Rates of supply of the amide always greatly exceeded its incorporation as such into protein. An asparaginase (l-asparagine amido hydrolase EC 3.5.1.1) was demonstrated in crude extracts of seeds. In vitro activity was
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41. Nutrition of a Developing Legume Fruit: Functional Economy in Terms of Carbon, Nitrogen, Water 1
The economy of functioning of the developing fruit of white lupin (Lupinus albus L.) is assessed quantitatively in relation to intake and usage of carbon, nitrogen, and water. Of every 100 units of carbon imported from the parent plant, 52 are incorporated into seeds, 37 into nonmobilizable material of the pod, and the remaining 11 lost as CO2 to the atmosph
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42. Assimilation and Transport of Nitrogen in Nonnodulated (NO3-grown) Lupinus albus L 1
The response of nonnodulated white lupin (Lupinus albus L. cv. Ultra) plants to a range of NO3 levels in the rooting medium was studied by in vitro assays of extracts of plant parts for NO3 reductase (EC 1.6.6.1) activity, measurements of NO3-N in plant organs, and solute analyses of root bleeding (xylem) sap and phloem sap from stems and petioles. Plants we
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43. Linking Development and Determinacy with Organic Acid Efflux from Proteoid Roots of White Lupin Grown with Low Phosphorus and Ambient or Elevated Atmospheric CO2 Concentration1
White lupin (Lupinus albus L.) was grown in hydroponic culture with 1 μm phosphorus to enable the development of proteoid roots to be observed in conjunction with organic acid exudation. Discrete regions of closely spaced, determinate secondary laterals (proteoid rootlets) emerged in near synchrony on the same plant. One day after reaching their final lengt
American Society of Plant Physiologists.
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44. Phloem Glutamine and the Regulation of O2 Diffusion in Legume Nodules.
The aim of the present study was to test the hypothesis that the N content or the composition of the phloem sap that supplies nodulated roots may play a role in the feedback regulation of nitrogenase activity by increasing nodule resistance to O2 diffusion. Treating shoots of lupin (Lupinus albus cv Manitoba) or soybean (Glycine max L. Merr. cv Maple Arrow)
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45. Red Light-enhanced Phytochrome Pelletability: Re-examination and Further Characterization 1
Red light-enhanced pelletability of phytochrome was observed in extracts of all 11 plants tested: Avena sativa L., Secale cereale L., Zea mays L., Cucurbita pepo L., Sinapis alba L., Pisum sativum L., Helianthus anuus L., Raphanus sativus L., Glycine max (L.) Merr., Phaseolus vulgaris L., and Lupinus albus L. This enhanced pelletability was observed in all 1
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46. Modeling the Transport and Utilization of Carbon and Nitrogen in a Nodulated Legume 1
An empirical modeling technique was developed for depicting quantitatively the transport and partitioning of photosynthetically fixed C and symbiotically fixed N during 10-day intervals of a 40-day period in the growth of nodulated plants of white lupin (Lupinus albus L. cv. Ultra). Model construction utilized data for C and N consumption of plant parts and
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47. Uptake and Utilization of Xylem-borne Amino Compounds by Shoot Organs of a Legume 1
Amino compounds representative of the major N solutes of xylem sap were pulse-fed (10 to 20 minutes) singly in 14C-labeled form to cut transpiring shoots of white lupin (Lupinus albus L.). 14C distribution was studied by autoradiography and radioassays of phloem sap, leaflet tissues, and shoot parts harvested at intervals after labeling. Primary distribution
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48. Inhibition of Nodule Functioning in Cowpea by a Xanthine Oxidoreductase Inhibitor, Allopurinol
Allopurinol (1H-pyrazolo-[3,4-d]pyrimidine-4-ol), an inhibitor of xanthine oxidation in ureide-producing nodulated legumes, was taken up from the rooting medium, translocated in xylem, and transferred to nodules of both the ureide-forming cowpea (Vigna unguiculata L. Walp.) and the amide-forming white lupin (Lupinus albus L.). Cowpea suffered severe nitrogen