Effects of Ozone Stress on Leaf-Level Photosynthesis in Soybean (Glycine max)

Abstract:

Glycine max were exposed in nine the open-top chambers to three levels of ozone (O₃) concentration (ambient, approximately 45 nL·L^-1 and two elevated ozone, 80±10 nL·L^-1 and 110±10 nL·L^-1) in four different growing stages (branching, flowering, podding and filling). In order to study the effect of different ozone concentration on photosynthesis parameters, the emphasis of this research was on photosynthetic pigment contents, parameters of photosynthetic gas exchange, Hill reaction activity and Ca²⁺/Mg²⁺-ATPase activity in soybean leaves. This paper reveals its response process and degree of photosynthesis in soybean leaves under different elevated O₃, and it could establish the foundation for the study of plants adaptability mechanism under elevated O₃ on the molecular level. The results showed that elevated O₃ concentration accelerated peroxidation damage, and plants could not tolerate O₃-induced injure, thus reducing photosynthesis by stomatal closure because of O₃ exposure in soybean leaves. And O₃ stress caused an acceleration of caducity that might be in part responsible for the reduction of photosynthesis.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 114-117
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.114
• Online since: August 2013
• Authors: Yan Wang, Jun Li Wang, Tian Hong Zhao
• Keywords: Elevated O₃, Lipid Peroxidation, Photosynthesis Parameters, Soybean

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