Cutleaf coneflower ( Rudbeckia laciniata L.) response to ozone and ethylenediurea (EDU)

• Published in: Environmental pollution (1987) Vol. 157; no. 3; pp. 840 - 846
• Main Authors: Szantoi, Zoltan, Chappelka, Arthur H., Muntifering, Russell B., Somers, Greg L.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-03-2009; Elsevier
• Subjects: Air Pollutants - toxicity; air pollution; Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Biomass; cell wall components; cellulose; chemical concentration; chemical constituents of plants; Ecotoxicology - methods; Ecotoxicology, biological effects of pollution; ethylene diurea; Ethylenediurea; foliar spraying; Fundamental and applied biological sciences. Psychology; General aspects; hemicellulose; leaves; lignin; lignocellulose; Natural vegetation; nutrient content; Nutritive quality; Ozone; Ozone - toxicity; Phenylurea Compounds - pharmacology; Phenylurea Compounds - toxicity; phytotoxicity; plant damage; Plant Leaves - drug effects; Plant Leaves - growth & development; roots; Rudbeckia - drug effects; Rudbeckia - growth & development; Rudbeckia laciniata; Rudbekia laciniata L; Seedlings; Ethylenediurea; Nutritive quality; Ozone; Natural vegetation; Rudbekia laciniata L; Nutritive value; Compositae; Pollution; Dicotyledones; Angiospermae; Vegetation; Environment; Rudbeckia; Spermatophyta
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2008.11.014

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 (2×) 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, EDU
×
O
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.
EDU can potentially reduce O
3 visible injury in cutleaf coneflower, but may have phytotoxic effects regarding plant productivity.