title: Cutleaf coneflower (Rudbeckia laciniata L.) response to ozone and ethylenediurea (EDU).
abstract: Cutleaf coneflower (Rudbeckia laciniata L.) seedlings were placed into open-top chambers in May, 2004 and fumigated for 12 wks. Nine chambers were fumigated with either carbon-filtered air (CF), non-filtered air (NF) or twice-ambient (2x) ozone (O(3)). Ethylenediurea (EDU) was applied as a foliar spray weekly at 0 (control), 200, 400 or 600 ppm. Foliar injury occurred at ambient (30%) and elevated O(3) (100%). Elevated O(3) resulted in significant decreases in biomass and nutritive quality. Ethylenediurea reduced percent of leaves injured, but decreased root and total biomass. Foliar concentrations of cell-wall constituents were not affected by EDU alone; however, EDUxO(3) interactions were observed for total cell-wall constituents and lignocellulose fraction. Our results demonstrated that O(3) altered the physiology and productivity of cutleaf coneflower, and although reducing visible injury EDU may be phytotoxic at higher concentrations.
authors.affiliation: School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA.
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Szantoi
authors.forename: Arthur H
authors.initials: AH
authors.lastname: Chappelka
authors.forename: Russell B
authors.initials: RB
authors.lastname: Muntifering
authors.forename: Greg L
authors.initials: GL
authors.lastname: Somers
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D018533:Biomass; D054750:Ecotoxicology / Q000379:methods; D010126:Ozone / Q000633:toxicity*; D010671:Phenylurea Compounds / Q000494:pharmacology* / Q000633:toxicity; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development; D036582:Rudbeckia / Q000187:drug effects* / Q000254:growth & development; D036226:Seedlings
chemical_list: D000393:Air Pollutants; D010671:Phenylurea Compounds; C032766:ethylene diurea; D010126:Ozone