Cutleaf coneflower (Rudbeckia laciniata

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• 作者：Zoltan Szantoi ; Arthur H. Chappelka ; Russell B. Muntifering ; Greg L. Somers
• 关键词：Ozone ; Ethylenediurea ; Natural vegetation ; Nutritive quality ; Rudbekia laciniata L.
• 刊名：Environmental Pollution
• 出版年：2009
• 出版时间：March 2009
• 年：2009
• 卷：157
• 期：3
• 页码：840-846
• 全文大小：252 K

文摘

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 (O₃). 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 O₃ (100 % ). Elevated O₃ 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 × O₃ interactions were observed for total cell-wall constituents and lignocellulose fraction. Our results demonstrated that O₃ altered the physiology and productivity of cutleaf coneflower, and although reducing visible injury EDU may be phytotoxic at higher concentrations.