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Field assessment of a snap bean ozone bioindicator system under elevated ozone and carbon dioxide in a free air
Kent O Burkey1, Fitzgerald L Booker, Elizabeth A Ainsworth
1USDA-ARS, Plant Science Research Unit and Department of Crop Science, North Carolina State University, 3127 Ligon Street, Raleigh, NC 27607, USA. Kent.Burkey@ars.usda.gov
Abstract:
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.
