Response of Fluorescence and Chlorophyll Physiological Characteristics of Typical Urban Trees to Ozone Stress

Abstract

In this study, four typical urban landscaping tree species were selected, three open top air chambers with different ozone concentrations were set, and the responses of chlorophyll fluorescence, chlorophyll content and relative conductivity of the trees to ozone stress were studied. The results showed that with the increase in ozone concentration, the maximum photochemical efficiency, electron transfer quantum yield, electron transfer rate (ETR) and chlorophyll content of the different tree species decreased significantly, while the relative conductivity of the different tree species increased significantly. Compared with the ozone concentration of NF, under an ozone concentration of nf40 and nf80, the decline in the rate of Fv/Fm of Koelreuteria paniculata and Ginkgo biloba was 2.47 and 2.28 times that of Pinus bungeana and Platycladus orientalis, respectively, and the increase in the rate of relative conductivity of K. paniculata and G. biloba was 2.11 and 1.28 times that of P. bungeana and P. orientalis, respectively. Under different ozone concentrations, the photochemical efficiency, electron transfer rate, chlorophyll content and relative conductivity of P. bungeana and P. orientalis were higher than those of Ginkgo biloba and K. paniculata, indicating that K. paniculata and G. biloba were more sensitive to ozone. This study is of great significance for improving urban environmental quality and ozone control and also provides a basis for selecting tree species with strong ozone tolerance.

Identification of key responsive leaf physiochemical traits for ozone sensitivity in 16 Italian cultivars of Triticum durum subjected to peak concentrations

“…rapid (with just a few seconds required), non-destructive (enabling repeated measurements on the same tissue), and relatively cost-effective (if compared with the need to continuously perform numerous assays for chemical quantification, Flowers et al, 2007;Gao et al, 2022;Monga et al, 2015). However, it is worth pointing out that these physiological measurements are not always conclusive in explaining the intraspecific variability in O 3 sensitivity of durum wheat (Monga et al, 2015).…”

“…The sensitivity to O 3 of photosystem II (PSII) has made this approach a crucial technique for unravelling how plants can react to oxidative damage, which can in part explain the effects of O 3 at macroscopic level (Bussotti et al., 2011). These approaches are widely used for early detection of O 3 stress (before the onset of any visible symptoms), and to analyse species/genotypes/cultivars‐specific sensitivity to this gas, being rapid (with just a few seconds required), non‐destructive (enabling repeated measurements on the same tissue), and relatively cost‐effective (if compared with the need to continuously perform numerous assays for chemical quantification, Flowers et al., 2007; Gao et al., 2022; Monga et al., 2015). However, it is worth pointing out that these physiological measurements are not always conclusive in explaining the intraspecific variability in O 3 sensitivity of durum wheat (Monga et al., 2015).…”

Impacts of Climate and Anthropogenic Disturbances on Vegetation Structure and Functions

“…There are four articles included in this SI that conducted research on the effect of climate or anthropogenic changes on vegetation. Two of them investigate the mechanisms of the effects from the individual perspective [4,5], while the other two show the spatiotemporal pattern of the effects [6,7].…”

“…Gao et al (2022a) [5] discussed the impact of ozone stress on typical urban landscaping tree species. The results showed that with the increase in ozone concentration, the maximum photochemical efficiency, electron transfer quantum yield, electron transfer rate, and chlorophyll content of the different tree species decreased significantly, while their relative conductivity increased significantly.…”