Stomatal behavior of ozone-sensitive and -insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park
Grulke NE, Neufeld HS, Davison AW, Roberts M, Chappelka AH. 2007. Stomatal behavior of ozone-sensitive and -insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park. New Phytologist. 173(1):100-109
The objective of the study was to understand physiological mechanisms that might be at play in varying ozone sensitivity in cutleaf coneflower (Rudbeckia laciniata var. digitata) individuals at Great Smoky Mountains National Park. Researchers hypothesized that the stomatal response to varying environmental conditions might be the cause of varying sensitivity levels. Research was conducted at the forests edge at Purchase Knob in mid-summer of 2004. The cutleaf coneflowers were given a sensitivity score, followed by measurements of stomatal densities and gas exchange responses to light and vapor on the leaves of the plant. Results showed stomata of sensitive plants were less responsive than those of insensitive plants to experimentally increased and decreased light intensities. According to the researchers, different physiological attributes vary independently within an individual plant, and these can collectively confer sensitivity or insensitivity to O-3 injury.
- Type
- Journal Article
- Authors
- Grulke, N; Neufeld, H; Davison, A; Roberts, M; Chappelka, A
- Units
- ARD , GRSM
- Keywords
- AIRBIB, APHN, Appalachian Highlands Network, ARD_Park-Air-Info_Collection, cutleaf coneflower, Great Smoky Mountains National Park, GRSM, GRSM-00269, GRSM-00445, Ozone, ozone exposure, SER, Southeast Region, stomatal conductance, stomatal response