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Volume 7, Pages 128-133
Short Communication

Ethylenediurea (EDU) Affects the Growth of Ozone-Sensitive and Tolerant Ash (Fraxinus excelsior) Trees under Ambient O3 Conditions

1IPP-CNR, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy
2Department of Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza 1, Milan, Italy
3Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003-9320, USA
4PLA, Corso Casale 476, I-10128 Turin, Italy

Received 14 December 2006; Revised 14 December 2006; Accepted 15 December 2006

Academic Editor: Andrzej Bytnerowicz

Copyright © 2007 Elena Paoletti et al.


Adult ash trees (Fraxinus excelsior L.), known to be sensitive or tolerant to ozone, determined by presence or absence of foliar symptoms in previous years, were treated with ethylenediurea (EDU) at 450 ppm by gravitational trunk infusion over the 2005 growing season (32.5 ppm h AOT40). Tree and shoot growth were recorded in May and September. Leaf area, ectomycorrhizal infection, and leaf and fine root biomass were determined in September. EDU enhanced shoot length and diameter, and the number and area of leaves, in both O3-sensitive and tolerant trees. However, no EDU effects were recorded at the fine root and tree level. Therefore, a potential for EDU protection against O3-caused growth losses of forest trees should be evaluated during longer-term experiments.