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Ambient ozone effects on gas exchange and total non-structural carbohydrate levels in cutleaf coneflower (Rudbeckia laciniata L.) growing in Great Smoky Mountains National Park

Lookup NU author(s): Professor Howard Neufeld, Emeritus Professor Alan Davison

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Abstract

Ozone-sensitive and -tolerant individuals of cutleaf coneflower (Rudbeckia laciniata L) were compared for their gas exchange characteristics and total non-structural carbohydrates at Purchase Knob, a high elevation site in Great Smoky Mountains National Park, USA. Photosynthesis and stomatal conductance decreased with increased foliar stipple. Sensitive plants had lower photosynthetic rates for all leaves, except the very youngest and oldest when compared to tolerant plants. Stomatal conductance decreased with increasing leaf age, but no ozone-sensitivity differences were found. Lower leaves had less starch than upper ones, while leaves on sensitive plants had less than those on tolerant plants. These results show that ambient levels of ozone in Great Smoky Mountains National Park can adversely affect gas exchange, water use efficiency and leaf starch content in sensitive coneflower plants. Persistence of sensitive genotypes in the Park may be due to physiological recovery in low ozone years. (C) 2011 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Neufeld HS, Peoples SJ, Davison AW, Chappelka AH, Somers GL, Thomley JE, Booker FL

Publication type: Article

Publication status: Published

Journal: Environmental Pollution

Year: 2012

Volume: 160

Pages: 74-81

Print publication date: 14/10/2011

ISSN (print): 0269-7491

ISSN (electronic): 1873-6424

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.envpol.2011.09.010

DOI: 10.1016/j.envpol.2011.09.010

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