Szantoi Zoltan, Chappelka Arthur H, Muntifering Russell B, Somers Greg L
School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA.
Environ Pollut. 2009 Mar;157(3):840-6. doi: 10.1016/j.envpol.2008.11.014. Epub 2008 Dec 11.
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.
2004年5月，将羽裂金光菊（Rudbeckia laciniata L.）幼苗置于开顶式气室中，并熏蒸12周。九个气室分别用经过活性炭过滤的空气（CF）、未过滤的空气（NF）或两倍环境浓度（2x）的臭氧（O₃）进行熏蒸。每周以0（对照）、200、400或600 ppm的浓度对叶片进行乙二脲（EDU）喷雾处理。在环境臭氧浓度（30%）和高浓度臭氧（100%）下均出现了叶片损伤。高浓度臭氧导致生物量和营养品质显著下降。乙二脲降低了叶片损伤的百分比，但减少了根系和总生物量。单独使用乙二脲不会影响叶片细胞壁成分的浓度；然而，在总细胞壁成分和木质纤维素部分观察到了乙二脲与臭氧的相互作用。我们的结果表明，臭氧改变了羽裂金光菊的生理和生产力，虽然乙二脲降低了可见损伤，但在较高浓度下可能具有植物毒性。
