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Lookup NU author(s): Professor Howard Neufeld, Emeritus Professor Alan Davison
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Incidence and severity of visible foliar ozone injury on cutleaf coneflower (Rudbeckia laciniata L.) and crown-beard (Verbesina occidentalis Walt.) were determined along selected trails at three locations in Great Smoky Mountains National Park during the summers of 2000 and 2001: Clingmans Dome, kCherokee Orchard Road and Purchase Knob. Cutleaf coneflower exhibited a greater amount of foliar injury than crown-beard each year of the 2-year study. Incidence and severity of injury was significantly greater for cutleaf coneflower growing near the edge of the Clingmans Dome trail than in the interior of the stand. Injury was greater at Clingmans Dome than Purchase Knob (70% vs. 40% ozone-injured plants, respectively), coincident with greater ozone exposures. In contrast to Clingmans Dome, there were no differences in injury between plants growing near- and off-trail at Purchase Knob. Differences in sensitivity to ozone were not observed for crown-beard growing near the edge compared with the interior of the stand adjacent to the Cherokee Orchard Road Loop. Ozone injury was greatest on the lower leaves for both species sampled with over 95% of the injured leaves occurring on the lower 50% of the plant. This is the first report of foliar ozone injury on these plant species in situ, in the Park, illustrating the great variability in symptom expression with time, and within and between populations. © 2003 Elsevier Science Ltd. All rights reserved.
Author(s): Chappelka AH, Neufeld HS, Davison AW, Somers GL, Renfro JR
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Environmental Pollution: Symposium on Native Plants as Bioindicators of Air Pollutants held in Conjunction with the 34th Air Pollution Workshop
Year of Conference: 2003
Pages: 53-59
ISSN: 0269-7491
Publisher: Pergamon
URL: http://dx.doi.org/10.1016/S0269-7491(03)00086-1
DOI: 10.1016/S0269-7491(03)00086-1
PubMed id: 12804827
Library holdings: Search Newcastle University Library for this item
ISBN: 18736424
