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   <subfield code="a">Effects of varied soil nitrogen supply on Norway spruce ( Picea abies [L.] Karst.)</subfield>
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   <subfield code="b">II. Carbon metabolism in needles and mycorrhizal roots</subfield>
   <subfield code="c">[Thomas Wallenda, Christoph Schaeffer, Werner Einig, Astrid Wingler, Rüdiger Hampp, Bettina Seith, Eckhard George, Horst Marschner]</subfield>
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   <subfield code="a">The response of carbohydrate metabolism in 3-year-old Norway spruce plants to an increased amount of nitrogen supply to a N-poor forest soil was investigated in a pot experiment. After 7 months of treatment we found a decreased amount of starch in both needles and roots, together with decreased amounts of sucrose in needles of those plants grown under an enhanced inorganic N supply. In addition, the activity and the protein amount of the anaplerotic enzyme phosphoenolpyruvate carboxylase (PEPC) and the activity of NADP-dependent isocitrate dehydrogenase (IDH) were clearly increased. The activity of sucrose phosphate synthase (SPS) and the pool size of fructose 2,6-bisphosphate (F26BP) were not affected by high supply of inorganic N. These data indicate a shift of carbon flow from starch formation towards an enhanced provision of carbon skeletons for N assimilation and shoot growth. In parallel, we found decreased contents of fungus-specific compounds (ergosterol, mannitol, trehalose) in roots, which are indicators of a decreased colonization by ectomycorrhizal fungi, probably as a result of a changed allocation and partitioning of photoassimilates due to an increased N supply.</subfield>
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