Ozone-sensitive (S156) and -tolerant (R123 and R331) genotypes of snap bean (Phaseolus vulgaris L.) were tested as a plant bioindicator system for detecting O 3 effects at current and projected future levels of tropospheric O 3 and atmospheric CO 2 under field conditions. Plants were treated with ambient air, 1.4× ambient O 3 and 550 ppm CO 2 separately and in combination using Free Air Concentration Enrichment technology. Under ambient O 3 concentrations pod yields were not significantly different among genotypes. Elevated O 3 reduced pod yield for S156 (63%) but did not significantly affect yields for R123 and R331. Elevated CO 2 at 550 ppm alone did not have a significant impact on yield for any genotype. Amelioration of the O 3 effect occurred in the O 3 + CO 2 treatment. Ratios of sensitive to tolerant genotype pod yields were identified as a useful measurement for assessing O 3 impacts with potential applications in diverse settings including agricultural fields.
- Carbon dioxide
- Free air concentration enrichment (FACE)
- Snap bean
ASJC Scopus subject areas
- Health, Toxicology and Mutagenesis