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The role of ozone flux and antioxidants in the suppression of ozone injury by elevated CO2 in soybean.
J Exp Bot 2005; 56(418):2139-51JE

Abstract

The projected rise in atmospheric CO2 concentration is expected to increase growth and yield of many agricultural crops. The magnitude of this stimulus will partly depend on interactions with other components of the atmosphere such as tropospheric O3. Elevated CO2 concentrations often lessen the deleterious effects of O3, but the mechanisms responsible for this response have received little direct examination. Previous studies have indicated that protection against O3 injury by elevated CO2 can be attributed to reduced O3 uptake, while other studies suggest that CO2 effects on anti-oxidant metabolism might also be involved. The aim of this experiment was to test further the roles of O3 flux and antioxidant metabolism in the suppression of O3 injury by elevated CO2. In a two-year experiment, soybean [Glycine max (L.) Merr.] was exposed from emergence to maturity to charcoal-filtered air or charcoal-filtered air plus a range of O3 concentrations in combination with ambient or approximately twice-ambient CO2 concentrations in open-top field chambers. Experimental manipulation of O3 concentrations and estimates of plant O3 uptake indicated that equivalent O3 fluxes that suppressed net photosynthesis, growth, and yield at ambient concentrations of CO2 were generally much less detrimental to plants treated concurrently with elevated CO2. These responses appeared unrelated to treatment effects on superoxide dismutase, glutathione reductase, and peroxidase activities and glutathione concentration. Total ascorbic acid concentration increased by 28-72% in lower canopy leaves in response to elevated CO2 and O3 but not in upper canopy leaves. Increasing concentrations of atmospheric CO2 will likely ameliorate O3 damage to many crops due to reduced O3 uptake, increased carbon assimilation, and possibly as yet undetermined additional factors. The results of this study further suggest that elevated CO2 may increase the threshold O3 flux for biomass and yield loss in soybean.

Authors+Show Affiliations

US Department of Agriculture, Agricultural Research Service, Plant Science Research Unit, and Department of Crop Science, North Carolina State University, 3908 Inwood Road, Raleigh, NC 27603, USA. fbooker@mindspring.comNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15983015

Citation

Booker, Fitzgerald L., and Edwin L. Fiscus. "The Role of Ozone Flux and Antioxidants in the Suppression of Ozone Injury By Elevated CO2 in Soybean." Journal of Experimental Botany, vol. 56, no. 418, 2005, pp. 2139-51.
Booker FL, Fiscus EL. The role of ozone flux and antioxidants in the suppression of ozone injury by elevated CO2 in soybean. J Exp Bot. 2005;56(418):2139-51.
Booker, F. L., & Fiscus, E. L. (2005). The role of ozone flux and antioxidants in the suppression of ozone injury by elevated CO2 in soybean. Journal of Experimental Botany, 56(418), pp. 2139-51.
Booker FL, Fiscus EL. The Role of Ozone Flux and Antioxidants in the Suppression of Ozone Injury By Elevated CO2 in Soybean. J Exp Bot. 2005;56(418):2139-51. PubMed PMID: 15983015.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role of ozone flux and antioxidants in the suppression of ozone injury by elevated CO2 in soybean. AU - Booker,Fitzgerald L, AU - Fiscus,Edwin L, Y1 - 2005/06/27/ PY - 2005/6/29/pubmed PY - 2005/9/24/medline PY - 2005/6/29/entrez SP - 2139 EP - 51 JF - Journal of experimental botany JO - J. Exp. Bot. VL - 56 IS - 418 N2 - The projected rise in atmospheric CO2 concentration is expected to increase growth and yield of many agricultural crops. The magnitude of this stimulus will partly depend on interactions with other components of the atmosphere such as tropospheric O3. Elevated CO2 concentrations often lessen the deleterious effects of O3, but the mechanisms responsible for this response have received little direct examination. Previous studies have indicated that protection against O3 injury by elevated CO2 can be attributed to reduced O3 uptake, while other studies suggest that CO2 effects on anti-oxidant metabolism might also be involved. The aim of this experiment was to test further the roles of O3 flux and antioxidant metabolism in the suppression of O3 injury by elevated CO2. In a two-year experiment, soybean [Glycine max (L.) Merr.] was exposed from emergence to maturity to charcoal-filtered air or charcoal-filtered air plus a range of O3 concentrations in combination with ambient or approximately twice-ambient CO2 concentrations in open-top field chambers. Experimental manipulation of O3 concentrations and estimates of plant O3 uptake indicated that equivalent O3 fluxes that suppressed net photosynthesis, growth, and yield at ambient concentrations of CO2 were generally much less detrimental to plants treated concurrently with elevated CO2. These responses appeared unrelated to treatment effects on superoxide dismutase, glutathione reductase, and peroxidase activities and glutathione concentration. Total ascorbic acid concentration increased by 28-72% in lower canopy leaves in response to elevated CO2 and O3 but not in upper canopy leaves. Increasing concentrations of atmospheric CO2 will likely ameliorate O3 damage to many crops due to reduced O3 uptake, increased carbon assimilation, and possibly as yet undetermined additional factors. The results of this study further suggest that elevated CO2 may increase the threshold O3 flux for biomass and yield loss in soybean. SN - 0022-0957 UR - https://www.unboundmedicine.com/medline/citation/15983015/The_role_of_ozone_flux_and_antioxidants_in_the_suppression_of_ozone_injury_by_elevated_CO2_in_soybean_ L2 - https://academic.oup.com/jxb/article-lookup/doi/10.1093/jxb/eri214 DB - PRIME DP - Unbound Medicine ER -