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- W167441330 abstract "Constraints upon plant growth imposed by low availability of N are a characteristic feature of many ecosystems dominated by ectomycorrhizal (ECM) plants. The potential importance of organic N sources for the nutrition of mycorrhizal plants came from studies first of ericoid mycorrhiza (ERM) and then of ECM symbioses. The ease with which many ECM fungi can be grown in axenic culture has enabled screening of their abilities to use different forms of N. Most species readily use ammonium, nitrate, and some simple organic N compounds, although there are differences at both the inter- and intraspecific levels. Much new information has been gained concerning the biochemistry of N assimilation, in particular in relation to the enzymes involved in assimilation of ammonium, which in many ECM fungi, appears to be the preferred source of inorganic N. Progress has been made towards characterization of the processes of nitrate and ammonium uptake and transport at the molecular levels. This has enabled a better understanding of the mechanisms and pathways whereby uptake of mineral N sources takes place in ECM symbioses. It has been recognized that much of the N contained in the superficial layer of soil occupied by ECM roots is in organic form and that some ECM fungi have access to these more complex N sources. The molecular studies, mostly using Amanita muscaria,by revealing N dependent expression profiles of N importer genes, have enabled us to envisage how N uptake by the fungi and transfer to the plant may occur in nature. The pathways and processes involved in the import and transfer of N across the ECM interfaces are intrinsically linked to those by which carbon is transferred in the reverse direction." @default.
- W167441330 created "2016-06-24" @default.
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- W167441330 date "2008-01-01" @default.
- W167441330 modified "2023-10-18" @default.
- W167441330 title "Nitrogen mobilization and nutrition in ectomycorrhizal plants" @default.
- W167441330 doi "https://doi.org/10.1016/b978-012370526-6.50011-8" @default.
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