Phloem transport of amino acids in relation to their cytosolic levels in barley leaves
A comparison of barley (Hordeum vulgare L.) leaves was made between the cytosolic content of amino acids and sucrose as determined by subcellular fractionation and the corresponding concentration in phloem sap, which was collected continuously for up to 6 days from severed aphid stylets. Because ami...
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| Published in | Plant physiology (Bethesda) Vol. 99; no. 3; pp. 996 - 1004 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Rockville, MD
American Society of Plant Physiologists
01.07.1992
|
| Subjects | |
| Online Access | Get full text |
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| Abstract | A comparison of barley (Hordeum vulgare L.) leaves was made between the cytosolic content of amino acids and sucrose as determined by subcellular fractionation and the corresponding concentration in phloem sap, which was collected continuously for up to 6 days from severed aphid stylets. Because amino acids were found to be almost absent from the vacuoles, and because the amino acid patterns in the stroma and cytosol are similar, whole leaf contents could be taken as a measure of cytosolic amino acid levels for a comparison of data during a diurnal cycle. The results show that the pattern of amino acids in the phloem sap was very similar to the pattern in the cytosol. Therefore, we concluded that the overall process of transfer of amino acids from the cytosol of the source cells into the sieve tubes, although carrier mediated, may be a passive process and that the translocation of amino acids via the sieve tubes requires the mass flow of sucrose driven by the active sucrose transport involved by the phloem loading |
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| AbstractList | A comparison of barley (Hordeum vulgare L.) leaves was made between the cytosolic content of amino acids and sucrose as determined by subcellular fractionation and the corresponding concentration in phloem sap, which was collected continuously for up to 6 days from severed aphid stylets. Because amino acids were found to be almost absent from the vacuoles, and because the amino acid patterns in the stroma and cytosol are similar, whole leaf contents could be taken as a measure of cytosolic amino acid levels for a comparison of data during a diurnal cycle. The results show that the pattern of amino acids in the phloem sap was very similar to the pattern in the cytosol. Therefore, we concluded that the overall process of transfer of amino acids from the cytosol of the source cells into the sieve tubes, although carrier mediated, may be a passive process and that the translocation of amino acids via the sieve tubes requires the mass flow of sucrose driven by the active sucrose transport involved by the phloem loading A comparison of barley (Hordeum vulgare L.) leaves was made between the cytosolic content of amino acids and sucrose as determined by subcellular fractionation and the corresponding concentration in phloem sap, which was collected continuously for up to 6 days from severed aphid stylets. Because amino acids were found to be almost absent from the vacuoles, and because the amino acid patterns in the stroma and cytosol are similar, whole leaf contents could be taken as a measure of cytosolic amino acid levels for a comparison of data during a diurnal cycle. The results show that the pattern of amino acids in the phloem sap was very similar to the pattern in the cytosol. Therefore, we concluded that the overall process of transfer of amino acids from the cytosol of the source cells into the sieve tubes, although carrier mediated, may be a passive process and that the translocation of amino acids via the sieve tubes requires the mass flow of sucrose driven by the active sucrose transport involved by the phloem loading. |
| Author | Winter, H. (Universitat Gottingen, Gottingen, Germany) Heldt, H.W Lohaus, G |
| Author_xml | – sequence: 1 fullname: Winter, H. (Universitat Gottingen, Gottingen, Germany) – sequence: 2 fullname: Lohaus, G – sequence: 3 fullname: Heldt, H.W |
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| Keywords | Translocation Monocotyledones Fractionation Sap Hordeum vulgare Sucrose Plant leaf Source sink relationship Vacuole Cereal crop Assay Phloem Gramineae Aminoacid Angiospermae Spermatophyta Chemical composition Conductive tissue Chloroplast Cytoplasm |
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| SubjectTerms | ACIDE AMINE Amino acid metabolism Amino acids AMINOACIDOS ANALISIS CUANTITATIVO ANALYSE QUANTITATIVE Barley Biological and medical sciences CITOPLASMA COMPOSICION QUIMICA COMPOSITION CHIMIQUE CYTOPLASME Cytosol FEUILLE FLOEMA FOTOSINTESIS Fundamental and applied biological sciences. Psychology HOJAS HORDEUM VULGARE Leaves LUMIERE LUZ Mesophyll cells Metabolism Metabolism and Enzymology METABOLISME METABOLISMO METABOLITE METABOLITOS OBSCURIDAD OBSCURITE Phloem PHLOEME PHOTOSYNTHESE Photosynthesis, respiration. Anabolism, catabolism Plant physiology and development Plants RITMOS BIOLOGICOS RYTHME BIOLOGIQUE Sieve tubes TRANSPORT DES SUBSTANCES NUTRITIVES TRANSPORTE DE NUTRIENTES Vacuoles |
| Title | Phloem transport of amino acids in relation to their cytosolic levels in barley leaves |
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