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  • ISE  (1)
  • Root mucilages  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Metal binding properties of high molecular weight soluble exudates from maize (Zea mays L.) roots (1987)
    Springer
    Biology and fertility of soils 3 (1987), S. 165-169 
    Details
    ISSN: 1432-0789
    Keywords: Root exudates ; Copper ; Cadmium ; Lead ; Zinc ; Dialysis ; ISE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A high molecular weight (MW 〉 1000) soluble root exudate fraction (HS) was isolated from hydroponic axenic maize cultures in order to investigate its metal-binding properties. Measurements of the maximum binding ability (MBA) and the overall stability constants (log K) for cadmium-, copper-, lead- and zinc-HS associations were obtained from dialysis and ion-selective electrode titrations. All results showed the occurrence of organometallic bindings. Data fitted to linear Langmuir isotherms. The MBA, measured by dialysis titration, varied from 160 to 206 mEq/100 g HS according to the nature of the metal. log K values, following the series Pb 〉 Cu 〉 Cd 5 Zn, varied from 3.15 to 3.65. Due to these metal-binding properties, soluble root products could play a role in the transfer of metal into the rhizosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255778
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of Pb2+, Cu2+ and Cd2+ binding with mucilage exudates from maize (Zea mays L.) roots (1986)
    Springer
    Biology and fertility of soils 2 (1986), S. 29-34 
    Details
    ISSN: 1432-0789
    Keywords: Root mucilages ; Maize ; Lead ; Copper ; Cadmium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The pectic nature of root mucilages suggests a hypothetical action of these substances on heavy metal flux into the root. In this study the existence of relations between heavy metals and root mucilages were verified and quantified. In order to obtain substantial amounts of pure root mucilages, two methods of collection were developed, using: (1) maize plants grown in the field and (2) hydroponic axenic cultures. The study of mucilage-metal binding was conducted using the dialysis method, which was developed in a previous work. Results show that root mucilages are able to bind metals. The importance of the binding depends on the nature of the cation, following the order Pb 〉 Cu 〉 Cd. These reactions could be due to exchange processes involving mucilage cations (Ca2+, Mg2+) and heavy metals. The role of mucilages on the retention of heavy metals in the rhizosphere is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00638958
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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