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Lookup NU author(s): Professor Howard Neufeld, Emeritus Professor Alan Davison, Dr Mark Roberts
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• Morphological and physiological attributes were assessed to elucidate the underlying mechanisms of ozone (O3) sensitivity in a highly sensitive species, cutleaf coneflower (Rudbeckia laciniata var. digitata). • Foliage at the same height in the canopy on paired O 3-sensitive and -insensitive cutleaf coneflowers was assessed for level of foliar symptoms, stomatal density, stomatal responsiveness to dynamic changes in light and leaf-to-air vapor pressure deficit (VPD), steady-state responses to light and CO2, intrinsic transpirational efficiency, and plant water balance. • There were no morphological differences between the sensitivity types that might have contributed to greater O3 uptake in sensitive individuals. Stomata of sensitive plants were less responsive than those of insensitive plants to experimentally increased and decreased light intensities, and to increased VPD. O3-insensitive plants had greater intrinsic transpirational efficiencies, greater maximum assimilation rates under saturating CO2 and light, and greater carboxylation rates. • Different physiological attributes vary independently within an individual plant, which collectively confer sensitivity or insensitivity to O3 injury. © New Phytologist (2006).
Author(s): Grulke NE, Neufeld HS, Davison AW, Roberts M, Chappelka AH
Publication type: Article
Publication status: Published
Journal: New Phytologist
Year: 2007
Volume: 173
Issue: 1
Pages: 100-109
ISSN (print): 0028-646X
ISSN (electronic): 1469-8137
Publisher: Wiley-Blackwell Publishing Ltd.
URL: http://dx.doi.org/10.1111/j.1469-8137.2006.01872.x
DOI: 10.1111/j.1469-8137.2006.01872.x
PubMed id: 17176397
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