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  1. No Access

    Article

    Pre-inoculation with arbuscular mycorrhizal fungi increases early nutrient concentration and growth of field-grown leeks under high productivity conditions

    Pre-inoculation of transplants with arbuscular mycorrhizal fungi may increase the in-field P uptake through an increased exploitation of the soil volume and, thereby, reduce the need for P fertilizer applicati...

    J. N. Sorensen, J. Larsen, I. Jakobsen in Plant and Soil (2008)

  2. No Access

    Article

    Mycorrhiza formation and nutrient concentration in leeks (Allium porrum) in relation to previous crop and cover crop management on high P soils

    An improved integration of mycorrhizas may increase the sustainability in plant production. Two strategies for increasing the soil inoculum potential of mycorrhizal fungi were investigated in field experiments...

    J. N. Sorensen, J. Larsen, I. Jakobsen in Plant and Soil (2005)

  3. No Access

    Article

    Beyond the rhizosphere: growth and function of arbuscular mycorrhizal external hyphae in sands of varying pore sizes

    Research on nutrient acquisition by symbiotic arbuscular mycorrhizal (AM) fungi has mainly focused on the root–fungus interface and less attention has been given to the growth and functioning of external hypha...

    E.A. Drew, R.S. Murray, S.E. Smith, I. Jakobsen in Plant and Soil (2003)

  4. No Access

    Chapter

    Function and Diversity of Arbuscular Mycorrhizae in Carbon and Mineral Nutrition

    The function of arbuscular mycorrhizae (AM) is discussed in terms of reciprocal nutrient exchange within single pairs of symbionts. Emphasis is on carbon and phosphate nutrition and on the importance of divers...

    I. Jakobsen, S. E. Smith, F. A. Smith in Mycorrhizal Ecology (2003)

  5. No Access

    Article

    Laboratory and field methods for measurement of hyphal uptake of nutrients in soil

    Experimental systems for measuring nutrient transport by arbuscular mycorrhizal (AM) fungi in soil are described. The systems generally include two soil compartments that are separated by fine nylon mesh. Both...

    P. Schweiger, I. Jakobsen in Plant and Soil (2000)

  6. No Access

    Article

    Diversity and evolution of T-cell receptor variable region genes in mammals and birds

     The receptor of a T lymphocyte (TCR) recognizes nonself antigens in the company of major histocompatibility complex (MHC) molecules presented to it by the antigen-presenting cell. The variable region of TCR i...

    C. Su, I. Jakobsen, X. Gu, M. Nei in Immunogenetics (1999)

  7. No Access

    Article

    Comparison of two test systems for measuring plant phosphorus uptake via arbuscular mycorrhizal fungi

     Plant phosphorus uptake via external hyphae of arbuscular mycorrhizal fungi has been measured using compartmented systems where a hyphal compartment is separated from a rooting compartment by a fine mesh. By ...

    P. F. Schweiger, I. Thingstrup, I. Jakobsen in Mycorrhiza (1999)

  8. No Access

    Chapter and Conference Paper

    The Role of Mycorrhizas in Plant P Nutrition: Fungal Uptake Kinetics and Genotype Variation

    Because of the widespread occurrence of arbuscular mycorrhizas (AM) across plant families and across habitats and because of their mutualistic nature, nutrient uptake by soil-grown plants can be fully understo...

    P. F. Schweiger, I. Jakobsen in Plant Nutrition — Molecular Biology and Genetics (1999)

  9. No Access

    Chapter

    Transport of Phosphorus and Carbon in Arbuscular Mycorrhizas

    The evolutionary success of arbuscular mycorrhizas reflects the unique combination of a superior biotrophic mode of fungal carbon acquisition and the ability of the living plant to absorb nutrients, especially...

    I. Jakobsen in Mycorrhiza (1999)

  10. No Access

    Article

    Detection of necrosis in human tumour xenografts by proton magnetic resonance imaging

    Tumours with necrotic regions have an inadequate blood supply and are expected to differ from well-vascularised tumours in response to treatment. The purpose of the present work was to investigate whether prot...

    I Jakobsen, O Kaalhus, H Lyng, EK Rofstad in British Journal of Cancer (1995)

  11. No Access

    Chapter

    Transport of Phosphorus and Carbon in VA Mycorrhizas

    The evolutionary success of VA mycorrhizas reflects the unique combination of a superior biotrophic mode of fungal carbon acquisition and the ability of the living plant to absorb nutrients, especially phospho...

    I. Jakobsen in Mycorrhiza (1995)

  12. No Access

    Article

    Hyphal N transport by a vesicular-arbuscular mycorrhizal fungus associated with cucumber grown at three nitrogen levels

    Cucumis sativus L. cv. Aminex (F1 hybrid) was grown alone or in symbiosis with Glomus intraradices Schenck and Smith in containers with two hyphal compartments (HCA and HCB) on either side of a root compartment ...

    A. Johansen, I. Jakobsen, E. S. Jensen in Plant and Soil (1994)

  13. No Access

    Article

    Research approaches to study the functioning of vesicular-arbuscular mycorrhizas in the field

    Approaches suitable for the study on the functioning of vesicular-arbuscular mycorrhizas (VAM) in the field are discussed, with emphasis on those VAM-specific processes which may influence P nutrition of crops...

    I. Jakobsen in Plant and Soil (1994)

  14. No Access

    Chapter

    Hyphal phosphorus transport, a keystone to mycorrhizal enhancement of plant growth

    The beneficial effects of arbuscular mycorrhizas on plant growth are in most cases caused by the transfer of mineral nutrients from the fungus to its host plant. Nutrients involved are those which are transpor...

    I. Jakobsen, E. J. Joner, J. Larsen in Impact of Arbuscular Mycorrhizas on Sustai… (1994)

  15. No Access

    Article

    Hyphal transport by a vesicular-arbuscular mycorrhizal fungus of N applied to the soil as ammonium or nitrate

    Transport of N by hyphae of a vesicular-arbuscular mycorrhizal fungus was studied under controlled experimental conditions. The N source was applied to the soil as 15NH inf4 su...

    A. Johansen, I. Jakobsen, E. S. Jensen in Biology and Fertility of Soils (1993)

  16. No Access

    Article

    Reduction of bacterial growth by a vesicular-arbuscular mycorrhizal fungus in the rhizosphere of cucumber (Cucumis sativus L.)

    Cucumber was grown in a partially sterilized sand-soil mixture with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus fasciculatum or left uninoculated. Fresh soil extract was places in polyvinyl chloride ...

    H. Christensen, I. Jakobsen in Biology and Fertility of Soils (1993)

  17. No Access

    Article

    Photosynthetic light-response curves

    Gradients in photosynthetic capacity through the leaf affect the shape of the irradiance-response curve. These gradients in photosynthetic capacity were manipulated by restraining leaves in different orientati...

    J. R. Evans, I. Jakobsen, E. Ögren in Planta (1993)

  18. No Access

    Article

    Effects of VA mycorrhiza on yield and harvest index of field-grown pea

    A field experiment was carried out to study the influence of vesicular-arbuscular mycorrhiza (VAM) on nutrient uptake and growth of pea at two levels of P fertilizer. Pea was grown in dazomet-fumigated and non...

    I. Jakobsen in Plant and Soil (1987)

  19. No Access

    Article

    The effect of pretransplant inoculation with VA mycorrhizal fungi on the subsequent growth of leeks in the field

    Leek plants were preinoculated with a mixed inoculum ofGlomus caledonium, Glomus fasciculatum andGlomus sp., and transplanted to Dazomet disinfected and untreated field plots of moderate P deficiency. Successive ...

    M. Sasa, G. Zahka, I. Jakobsen in Plant and Soil (1987)