Ethylenediurea (EDU) affects the growth of ozone-sensitive and tolerant ash (Fraxinus excelsior) trees under ambient O3 conditions.
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.
Paoletti
Elena
E
IPP-CNR, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy. e.paoletti@ipp.cnr.it
Contran
Nicla
N
Manning
William J
WJ
Tagliaferro
Francesco
F
D000393:Air Pollutants / Q000037:antagonists & inhibitors* / Q000633:toxicity; D031661:Fraxinus / Q000187:drug effects* / Q000254:growth & development; D010126:Ozone / Q000037:antagonists & inhibitors* / Q000633:toxicity; D010671:Phenylurea Compounds / Q000494:pharmacology*; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development
D000393:Air Pollutants; D010671:Phenylurea Compounds; C032766:ethylene diurea; D010126:Ozone