Assessment of the impact of increasing concentrations of ozone on photosynthetic components of maize (Zea mays L.), a C4 plant

Ozone exposure and flux-based response functions for photosynthetic traits in wheat, maize and poplar

“…This stimulation may rather respond to a stronger demand in reducing power for detoxification and repair processes (Dizengremel et al, 2012). In maize leaves, the activity of PEPc, which is in charge of the primary step of CO 2 fixation, is strongly reduced in response to ozone, as previously shown by Leitao et al (2007b). The doseresponse relationship in maize for PEPc activity was similar to that for chlorophyll content, whereas the less pronounced response of Rubisco activity rather correlates to the response of CO 2 assimilation.…”

“…The negative impact of ozone on the photosynthetic function, which ultimately leads to reduced biomass production and yield, is widely documented in plants in general (Wittig et al, 2007) and specifically in wheat (e.g. Feng et al, 2011), maize (Leitao et al, 2007b) and poplar (Bagard et al, 2008). L€ ow et al (2007) have described ozone dose-response relationships for photosynthetic parameters in beech, but our study provides for the first time a comparison of exposure-and doseresponse relationships obtained in crop and tree species grown and exposed to ozone under the same experimental conditions.…”

“…Published relationships are based either on CO 2 assimilation rate (Bagard et al, 2008;L€ ow et al, 2007;Dumont et al, 2013) or leaf injury (Marzuoli et al, 2009). While maize worldwide production is the largest among food crops, the literature on the impact of ozone on this C4 grass is relatively poor, with reports of adverse effects of the pollutant on grain yield (Rudorff et al, 1996;Van Dingenen et al, 2009), biomass production (Leitao et al, 2007a) and leaf biochemical parameters (Leitao et al, 2007b;Ahmad et al, 2012). Despite the agroeconomical value of maize, no ozone flux-response relationship is available in the literature.…”

Effects of ambient O₃ on wheat during reproductive development: Gas exchange, photosynthetic pigments, chlorophyll fluorescence, and carbohydrates

“…Saitanis et al (2001) reported greater reduction in Chl a than Chl b of tobacco plants exposed to O 3 . Greater sensitivity of Chl a to O 3 implies a lower capacity for light harvesting (Leitao et al 2007). Significant interaction between treatment and leaf age for reduction in Chl content may be caused by O 3 -induced accelerated senescence with increasing age.…”

Sensitivity of Gas Exchange Parameters to Ozone in Diverse C4 Sugarcane Hybrids

“…In C 3 cotton ( Gossypium barbadense L.), carbon assimilation was 3.0‐fold more sensitive to O 3 than in C 4 yellow nutsedge ( Cyperus esculentus L.) (Grantz and Shrestha, 2006). A meta‐analysis of reproductive impacts of O 3 (Leisner and Ainsworth, 2011) found that in exposures to O 3 above 70 nmol mol −1 , fruit weight was less sensitive in maize than in C 3 plants, although most reproductive parameters were equally inhibited in C 3 and C 4 plants. Ozone exposure stimulated induction of cellular antioxidants in maize to the same extent as in C 3 plants (Ruzsa et al, 1999), although the protective impact on growth and carbon assimilation is unknown.…”