Elevated CO2 ameliorated oxidative stress induced by elevated O3 in Quercus mongolica

Abstract

Using open top chambers, the effects of elevated O 3 (80 nmol mol -1 ) and elevated CO 2 (700 lmol mol -1 ), alone and in combination, were studied on young trees of Quercus mongolica. The results showed that elevated O 3 increased malondialdehyde content and decreased photosynthetic rate after 45 days of exposure, and prolonged exposure (105 days) induced significant increase in electrolyte leakage and reduction of chlorophyll content. All these changes were alleviated by elevated CO 2 , indicating that oxidative stress on cell membrane and photosynthesis was ameliorated. After 45 days of exposure, elevated O 3 stimulated activities of superoxide dismutase (SOD, EC 1.15.

Physiological, biochemical, and genome‐wide transcriptional analysis reveals that elevated CO2 mitigates the impact of combined heat wave and drought stress in Arabidopsis thaliana at multiple organizational levels

“…Similarly, in our study, elevated CO 2 reduced the impact of the combination of heat wave and drought stress on gas exchange and PSII efficiency. protein oxidation) during climate extremes under elevated CO 2 , which is consistent with studies reporting that elevated CO 2 mitigates oxidative stress induced by abiotic stresses (Perez-Lopez et al, 2009;Kun et al, 2010;Yan et al, 2010). In addition, we observed less oxidative damage (e.g.…”

“…In addition, we observed less oxidative damage (e.g. protein oxidation) during climate extremes under elevated CO 2 , which is consistent with studies reporting that elevated CO 2 mitigates oxidative stress induced by abiotic stresses (Perez-Lopez et al, 2009;Kun et al, 2010;Yan et al, 2010). This stress-mitigation under elevated CO 2 may result from improved ROS detoxification.…”

Variation of Antioxidant System in Pinus armandii under Elevated O3 in an Entire Growth Season

“…Consistently, Reich 33 proposed that O 3 tolerance was higher in conifers than in broadleaf trees, as a result of less O 3 uptake subsequent to lower stomatal conductance in needles at elevated O 3 . However, in contrast to some Mediterranean conifers such as Pinus halepensis and Pinus pinea , Mediterranean evergreen broadleaf trees are shown to be more tolerant to O 3 pollution, because they have sclerophyllous leaves, low gas exchange rates and high antioxidant ability to tolerate oxidative stress 14, 20–29, 34–40. In addition, Pinus ponderosa , a widely distributed conifer in North America, has been proved to be sensitive to O 3 as well, shown by foliar injury, growth reduction, and decreased photosynthetic capacity 41.…”

“…Ginkgo biloba and Quercus monogolica which are deciduous tree species grow in East Asia as well, and how antioxidant defense system responses to elevated O 3 in these trees has been illustrated in our previous studies 21–23. In this paper, we compared not only the response of antioxidant system to elevated O 3 in P. armandii with those in G. biloba and Q. monogolica , but also compared the responses of tree species in East Asia with those in other continents.…”

The Role of Ozone in the Succession of Native and Invasive Species in Mid-Atlantic Forests

“…However, and provide a level of protection based on the swift (5-10 s) detoxification of ROS (Loewus 1980, Loewus 1988, Kurata et al 1996, Smirnoff 1996, Deutsch 1997, Deutsch 1998, Sandermann et al 1998, Asada 1999, Polle and Pell 1999. The role of antioxidants in O 3 tolerance has been studied in a large number of important crops (e.g., Cheng et al 2007, Puckette et al 2007, Biswas et al 2008, Frei et al 2008, Keutgen and Pawelzik 2008 and timber species (e.g., He et al 2006, Yan et al 2010), but very little information is known about common species within communities frequently exposed to elevated ground-level O 3 . Furthermore, while the role of antioxidants in O 3 tolerance has been examined for individual species, it is rarely compared among species (cf.…”