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32 results on '"Jakobsen Iver"'

1. Roles of arbuscular mycorrhizas in plant phosphorus nutrition: interactions between pathways of phosphorus uptake in arbuscular mycorrhizal roots have important implications for understanding and manipulating plant phosphorus acquisition.

Author

Smith SE, Jakobsen I, Grønlund M, and Smith FA

Subjects
Gene Expression Regulation, Plant, Plants genetics, Symbiosis genetics, Mycorrhizae metabolism, Phosphorus metabolism, Plants metabolism, Signal Transduction genetics
Published
2011
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2. Arbuscular mycorrhiza reduces phytoextraction of uranium, thorium and other elements from phosphate rock.

Author

Roos P and Jakobsen I

Subjects
Geological Phenomena, Geology, Mycorrhizae physiology, Phosphates metabolism, Plants metabolism, Thorium metabolism, Uranium metabolism
Abstract

Uptake of metals from uranium-rich phosphate rock was studied in Medicago truncatula plants grown in symbiosis with the arbuscular mycorrhizal fungus Glomus intraradices or in the absence of mycorrhizas. Shoot concentrations of uranium and thorium were lower in mycorrhizal than in non-mycorrhizal plants and root-to-shoot ratio of most metals was increased by mycorrhizas. This protective role of mycorrhizas was observed even at very high supplies of phosphate rock. In contrast, phosphorus uptake was similar at all levels of phosphate rock, suggesting that the P was unavailable to the plant-fungus uptake systems. The results support the role of arbuscular mycorrhiza as being an important component in phytostabilization of uranium. This is the first study to report on mycorrhizal effect and the uptake and root-to-shoot transfer of thorium from phosphate rock.

Published
2008
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3. Mycorrhizal research on the move.

Author

Burleigh SH and Jakobsen I

Subjects
Cloning, Molecular, Fungal Proteins genetics, Fungal Proteins metabolism, Fungi genetics, Fungi metabolism, Phosphate Transport Proteins genetics, Research trends, Symbiosis, Transformation, Genetic, Vacuoles metabolism, Fungi growth & development, Plants microbiology
Published
2002
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32. VESICULAR-ARBUSCULAR MYCORRHIZA IN FIELD-GROWN CROPS I. MYCORRHIZAL INFECTION IN CEREALS AND PEAS AT VARIOUS TIMES AND SOIL DEPTHS.

Author

Jakobsen, Iver and Nielsen, Niels Erik

Subjects
*MYCORRHIZAL fungi, *ECTOMYCORRHIZAL fungi, *FUNGAL diseases of plants, *PLANTS, *PHOSPHATES, *BARLEY
Abstract

Development of infection by vesicular-arbuscular mycorrhiza (VAM) was studied in some field-grown crops. An infection plateau was reached within the first month after seedling emergence of spring barley, oats and peas. During the rest of the growth period the proportion of root length infected by VAM remained at about 50 % in the cereals and 75 % in the peas.. In the spring, infection levels were low in winter wheat, winter rye and winter barley, and development of infection was slower in them than in the spring-sown crops. VAM infection was also studied in relation to soil depth and root density. The proportion of root length infected decreased markedly below 40 cm soil depth.. Root density varied greatly between crops, whereas the absolute length of infected roots was similar in all crops. This indicates that susceptibility to infection was independent of host species. The results are discussed in relation to final phosphorus uptake and dry-matter production, and it is proposed that a relatively low soil-phosphorus availability was counterbalanced, to some extent, by a well-developed VAM infection. [ABSTRACT FROM AUTHOR]

Published
1983
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