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. 2007 Nov;150(2):200-8. doi: 10.1016/j.envpol.2007.01.020. Epub 2007 Apr 6.
Purple coneflower plants (Echinacea purpurea) were placed into open-top chambers (OTCs) for 6 and 12 weeks in 2003 and 2004, respectively, and exposed to charcoal-filtered air (CF) or twice-ambient (2x) ozone (O3) in 2003, and to CF, 2x or non-filtered (NF), ambient air in 2004. Plants were treated with ethylenediurea (EDU) weekly as a foliar spray. Foliar symptoms were observed in >95% of the plants in 2x-treated OTCs in both years. Above-ground biomass was not affected by 2x treatments in 2003, but root and total-plant biomass decreased in 2004. As a result of higher concentrations of select cell wall constituents (% ADF, NDF and lignin) nutritive quality was lower for plants exposed to 2x-O3 in 2003 and 2004 (26% and 17%, respectively). Significant EDU x O3 interactions for concentrations of cell wall constituents in 2003 indicated that EDU ameliorated O3 effects on nutritive quality. Interactions observed in 2004 were inconsistent.
2003年和2004年，分别将紫锥菊（紫松果菊）植株置于开顶式气室（OTC）中6周和12周，2003年使其暴露于经活性炭过滤的空气（CF）或两倍环境浓度（2x）的臭氧（O₃）中，2004年使其暴露于CF、2x或未过滤（NF）的环境空气中。每周对植株进行叶面喷施乙二脲（EDU）处理。两年中，在经2x处理的OTC中的植株，超过95%出现了叶部症状。地上生物量在2003年不受2x处理的影响，但在2004年根部和整株生物量均下降。由于特定细胞壁成分（酸性洗涤纤维、中性洗涤纤维和木质素百分比）浓度较高，2003年和2004年暴露于2x - O₃的植株的营养品质较低（分别降低了26%和17%）。2003年细胞壁成分浓度存在显著的EDU×O₃交互作用，表明EDU减轻了O₃对营养品质的影响。2004年观察到的交互作用并不一致。
