Response of Antioxidant System in Leaves of Ginkgo biloba to Elevated CO₂ and/or O₃ and its Natural Recovery in an Urban Area

Abstract:

Changes of oxidative stress and antioxidant system were studied in leaves of Ginkgo biloba exposed to elevated CO₂ and O₃ fumigation (2006-2008), and released the gases fumigation for the natural recovery in open-top chambers (OTCs) during the growing season in 2009. Elevated CO₂ had no significant effect on hydrogen peroxide (H₂O₂) and malondialdehyde (MDA) contents, and the activities of antioxidant enzymes in leaves of G. biloba during the gas fumigation in 2008. Elevated O3 increased significantly H₂O₂ and MDA contents, especially after 90 days of gas fumigation. The adverse effect or damage of elevated O₃ on trees during the gas fumigation was also alleviated by the released-O₃ exposure during the natural recovery. The antioxidative enzyme including superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities showed higher levels under the natural recovery than under the gas fumigation, which may be a helpful response to scavenging reactive oxygen species (ROS). The results also indicated that future alleviating the emissions of CO₂ and O₃ would differentially affect the antioxidant system in plants.

• Periodical: Advanced Materials Research (Volumes 641-642)
• Pages: 18-21
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.641-642.18
• Online since: January 2013
• Authors: Jiang Yan Gao, Sheng Xu, Wei Chen, Xing Yuan He
• Keywords: Antioxidative System, Elevated CO₂, Elevated O₃, Ginkgo Biloba, Oxidative Stress

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