| Synthesis, Storage, and Utilization of Amino Compounds in White Lupin (Lupinus albus L.). | |
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MedLine Citation:
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PMID: 16661629 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Changes in total N and in free amino compounds were followed during growth of nodulated white lupin. Leaflets contained the greatest fraction of plant N but had lower proportions (1 to 4%) of their N in soluble amino form than stem + petioles (10 to 27%) and reproductive parts (15 to 33%). Mobilization of free amino compounds from plant parts to fruits contributed at most only 7% of the total N intake of fruits, compared with 50% in mobilization of other forms of N and 43% from fixation during fruiting. Asparagine was usually the most abundant free amino compound in plant parts, followed by glutamine and alanine. Valine, glycine, isoleucine, aspartic acid and gamma-aminobutyric acid comprised the bulk of the remaining soluble amino N. Composition of tissue pools of amino-N closely resembled that of xylem and phloem exudates. Data on N flow and utilization were combined with information on composition of transport fluids to quantify syntheses, exchanges, and consumptions of asparagine, glutamine, aspartic acid, and valine by organs of the 51- to 58-day plant. These amino compounds carried 56, 29, 5, and 2%, respectively, of the N exported from nodules and contributed in roughly commensurate proportions to transport exchanges and N increments of plant parts. There were, however, more than expected involvements of glutamine and valine in mobilization of N from lower leaves, of asparagine in xylem to phloem transfer, and of aspartic acid in cycling of N through the root, and there was a less than expected participation of aspartic acid in xylem to phloem transfer and in phloem translocation to the shoot apex. The significance of these differences is discussed. |
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Authors:
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J S Pate; C A Atkins; D F Herridge; D B Layzell |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology Volume: 67 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 1981 Jan |
Date Detail:
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Created Date: 2010-06-29 Completed Date: 2010-06-29 Revised Date: 2010-09-14 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 37-42 Citation Subset: - |
Affiliation:
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Department of Botany, University of Western Australia, Nedlands, Western Australia, 6009. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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