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  • phloem sap  (2)
  • ATP content  (1)
  • Hordeum vulgare  (1)
  • nicotianamine amino-transferase  (1)
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Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of microbial biomass across the rhizosphere of barley (Hordeum vulgare L.) in soils (1989)
    Springer
    Biology and fertility of soils 7 (1989), S. 341-345 
    Details
    ISSN: 1432-0789
    Keywords: ATP content ; Bulk soil ; CO2 production ; Mineral N ; Nitrification inhibitor ; Rhizosphere ; Sewage sludge ; Hordeum vulgare
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The microbial activity at the soil-root interface (rhizosphere) of barley was examined using a rhizobox system. In this system, the soil was placed in several compartments separated from each other by a 500-mesh nylon cloth. Plants were grown in the central compartment and after a 2-month growing period the roots were still confined to this compartment. The soil from each compartment was then analyzed for ATP, NO3 /−, total N, total C and CO2 production. The increase in ATP concentration was found in a range of 4 mm around the roots. The ATP content and CO2 production across the rhizosphere were correlated in all the soils used, but changes in NO3 − were not correlated with ATP changes. The range of NO3 − change was wider than that of the ATP change, indicating that NO3 − production is not influenced by the biological activity in the rhizosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257830
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Biosynthetic pathway of phytosiderophores in iron-deficient graminaceous plants: A new assay system for the detection of nicotianamine amino-transferase activity (1993)
    Springer
    Plant and soil 155-156 (1993), S. 103-105 
    Details
    ISSN: 1573-5036
    Keywords: mugineic acid ; nicotianamine ; nicotianamine amino-transferase ; phytosiderophores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A new assay system for the detection of nicotianamine amino-transferase activity was developed. The activity of nicotianamine amino-transferase which participated in biosynthetic pathway of MAs from methionine in graminaceous plants was induced by the iron deficiency treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024994
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in the amino acid composition and protein modification in phloem sap of rice (1993)
    Springer
    Plant and soil 155-156 (1993), S. 171-174 
    Details
    ISSN: 1573-5036
    Keywords: amino acid ; nitrogen ; phloem sap ; phosphorylation ; protein ; rice (Oryza sativa L.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Pure phloem sap was collected from insects feeding on rice (Oryza sativa L.) leaves by a laser technique similar to the aphid stylet technique. Rapid circulation of nitrogen in the sieve tubes was demonstrated directly using 15N as a tracer. Application to the roots of the metabolic inhibitors of amino acids, aminooxyacetate and methioninesulfoximine, changed the amino acid composition in the sieve tubes. Feeding methionine to leaf tips resulted in its bulk transfer into the sieve tubes. In vitro experiments confirmed the existence of protein kinases in the pure rice phloem sap. The phosphorylation status of the sieve tube sap proteins was affected by the light regime. The possibility that changes in chemical composition or protein modification such as phosphorylation in the sieve tubes might affect plant growth are discussed. Analysis of pure phloem sap collected from rice plants by insect laser technique has shown dynamic changes in the chemical composition and the quality of proteins in the sap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025011
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Why are young rice plants highly susceptible to iron deficiency? (1991)
    Springer
    Plant and soil 130 (1991), S. 143-156 
    Details
    ISSN: 1573-5036
    Keywords: MAs ; mitochondria ; mugineic acid ; phloem sap ; phytosiderophore ; rice root ; root washing ; xylem sap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The reason why young rice plant is highly susceptible to Fe-deficiency was clarified as follows: Among Gramineae plants rice secreted a very low amount of deoxy-MA as a phytosiderophore even under Fe-deficiency, and the secretion by rice ceased within 10 days under Fe-deficiency although barley secreted MAs during a period of more than one month. When iron depletion continued, the rice root tips become chimeric and epidermal cells became necrotic. The mitochondrial membrane systems in the cortex cells were also severely damaged. Iron starvation occurred even in the mitochondria, and energy charge in the root decreased. This reduced energy charge has firstly diminished the secretion activity of deoxy-MA from the roots, secondly reduced the activity of the transporter which absorb deoxy-MA-FeIII chelate and finally reduced the synthesis of deoxy-MA from metionine. Consequently, the depletion of FeII in the shoot was induced and severe chlorosis rapidly developed in the young rice plant under Fe-deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011869
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    Paper (German National Licenses)
    Fulltext
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