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  • 1
    ISSN: 1432-1890
    Keywords: Key words Alkaline phosphatase ; Mycelium ; Acaulospora ; Gigaspora ; Glomus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Two glasshouse experiments were done to assess the development and metabolic activity of mycorrhizas formed by isolates of arbuscular mycorrhizal fungi (AMF) from three different genera, Acaulospora, Gigaspora and Glomus on either Pueraria phaseoloides L. or Desmodium ovalifolium L. plants. The second of the two experiments included three levels of a localised phosphate source in the pots. Alkaline phosphatase (ALP), stained histochemically in the intra-radical mycelium (IRM) of AMF over sequential harvests, did not provide a direct marker for the efficiency of AMF in mobilising phosphorus (P) for plant growth and development. The ability of the extra-radical mycelium (ERM) to scavenge a localised phosphate source, determined by its extraction from buried 35-μm mesh pouches, was dependent on the species of AMF tested. This work indicates that AMF from different genera have unique patterns of mycelial development when forming mycorrhizas with tropical hosts in the presence of a localised phosphate source. AMF also appear to have different mechanisms for the control of P transfer, within the mycelium, to the host. The significance of the architecture of the ERM is discussed as well as the localisation of ALP in the IRM in determining the efficiency of AMF in terms of P accumulation in planta and subsequent growth of plants.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 53 (1979), S. 131-136 
    ISSN: 1573-5036
    Keywords: Air pollution ; Grassland ; Native grass ; Sulfur ; Sulfur dioxide ; Uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Sulfur concentrations of western wheatgrass tillers and individual leaves were measured from plants exposed to four SO2 concentrations (9, 52, 105 and 183 μg·m−3). Sulfur concentration of plants was a linear function of either time of exposure or concentration. Young leaves and the youngest portion of leaves contained less sulfur than their older counterparts irregardless of whether they had or had not been exposed to SO2. Current hypotheses which relate plant sensitivity to amount of sulfur taken up do not apply for western wheatgrass.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5036
    Keywords: Atmosphere ; Selenium ; Sulfur ; Sulfur dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A native northern mixed prairie, Montana, U.S.A., was exposed to three controlled levels of sulfur dioxide and subplots fertilized with sulfur and/or selenium. Plant species that accumulated relatively greater quantities of soil sulfur did not necessarily accumulate relatively greater quantities of atmospheric sulfur, andvisa versa. Plant-sulfur concentrations increased with increasing time and level of exposure, but the rate of increase in plant-sulfur concentrations decreased with increasing SO2 concentration. Plants exposed to the high-SO2 concentration tended to have lower sulfur concentrations when growing in the sulfur-or the selenium-fertilized plots. High soil selenium caused a reduction in plant-sulfur content, but a decrease in plant selenium concentration with high soil sulfur could be detected only when comparing plants on the selenium and sulfur plus selenium plots, where high plant selenium concentrations were encountered.
    Type of Medium: Electronic Resource
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