Record ID No. |
700 |
Author(s) |
Haberer, K., Grebenc, T., Alexou, M., Gessler, A., Kraigher, H.,Rennenberg, H , 2007 |
Affiliation |
University of Freiburg, Chair of Tree Physiol, Inst Forest Bot & Tree Physiol, Georges Kohler Allee 053-054, D-79110 Freiburg, Germany |
Title |
Effects of long-term free-air ozone fumigation on delta N-15 and total N in Fagus sylvatica and associated mycorrhizal fungi |
Source. Vol.(no):Page |
Plant biology, 9(2): 242-252p. |
Categories |
Ectomycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Nitrogen metabolism |
Host |
Fagus sylvatica |
Organism |
EcM |
Country |
Germany, Europe |
Abstracts |
Patterns of nitrogen (N) isotope composition (delta N-15) and total N contents were determined in leaves, fine roots, root-associated ectomycorrhizal fungi (ECM) of adult beech trees (Fagus sylvatica), and soil material under ambient (1 x O-3) and double ambient (2 x O-3) atmospheric ozone concentrations over a period of two years. From fine root to leaf material delta N-15 decreased consecutively. Under enhanced ozone concentrations total N was reduced in fine roots and delta N-15 showed a decrease in roots and leaves. In the soil and in most types of mycorrhizae, delta N-15 and total IN were not altered due to ozone fumigation. The number of vital ectomycorrhizal root tips increased and the mycorrhizal community structure changed in 2 x O-3. Simultaneously, the specific rate of inorganic N-uptake by the roots was reduced under the double ozone regime. From these results it is assumed that 2 x O-3 changes N-nutrition of the trees at the level of N-acquisition, as indicated by enhanced mycorrhizal root tip density, altered mycorrhizal species composition, and reduced specific N-uptake rates. |