Ozone exposure differentially affects oxidative stress parameters in distinctPhaseolus vulgarisL. varieties

Abstract

Different oxidative stress parameters of four Brazilian varieties of Phaseolus vulgaris exposed to toxic O 3 concentrations were compared with the well-established bioindicator variety Pinto 111. Analysis of catalase (CAT) activity, lipoperoxidation and non-enzymatic antioxidant levels demonstrated that the varieties presented different susceptibilities to O 3 toxicity. Results indicated that Fepagro 26 and Guapo Brilhante increased the levels of lipoperoxidation in response to O 3 while catalase activity was not changed. On the opposite Iraı, Macotac¸o and Pinto 111 presented different pattern of lipoperoxidation and CAT activation indicating a relationship between CAT activation and resistance to lipoperoxidation. Analysis of the total non-enzymatic antioxidant defense levels demonstrated that although O 3 exposure decreased the non-enzymatic antioxidant defense in Iraı, lipoperoxidation levels was not enhanced in this variety as observed with Fepagro 26. Our results suggest that analysis of the oxidative stress parameters of varieties with known variations of susceptibility to O 3 may provide more precise protocols for early detection of O 3 toxicity.

Elevated ozone and carbon dioxide affects the composition of volatile organic compounds emitted by Vicia faba (L.) and visitation by European orchard bee (Osmia cornuta)

“…It is well established that plants attract and maintain their appeal to pollinators primarily via visual cues and VOCs, which enables pollinators to find appropriate flowers to collect nectar and pollen [ 68 ]. It may be possible that ozone alters color of flowers and leaves via oxidative stress [ 69 ]. However, we did not observe a change in the color of flowers under O 3 stress but injuries on leaves.…”

Ozone Induced Stomatal Regulations, MAPK and Phytohormone Signaling in Plants

“…The results obtained from ozone-induction experiments proved that the pollutant played a direct, active role in apoplastic ROS signaling [7]. As ozone is highly reactive and unstable, it can induce oxidative stress in plants by chemically modifying various molecules to produce short-lived ROS such as peroxides, hydroxyl radicals, and superoxide [8].…”

Nitric oxide: A core signaling molecule under elevated GHGs (CO2, CH4, N2O, O3)-mediated abiotic stress in plants

“…conditions, antioxidant systems are activated (Nogueś et al, 2008;Caregnato et al, 2010), including GSH and ascorbate-GSH cycle (Zhang et al, 2020). The molecular basis of O 3 -induced stress signals in plants has been widely investigated, of which an SA-dependent signaling pathway was reported to be activated in plants exposed to O 3 (Sharma and Davis, 1997).…”

“…In the process, various signaling pathways are activated and act as messengers to trigger an adequate adaptive response mechanism towards stress tolerance, along with the induction or suppression of stress-related genes ( Delaney et al., 1994 ; Sharma and Davis, 1995 ; Pasqualini et al., 2009 ). Under the same conditions, antioxidant systems are activated ( Nogués et al., 2008 ; Caregnato et al., 2010 ), including GSH and ascorbate-GSH cycle ( Zhang et al., 2020 ). The molecular basis of O 3 -induced stress signals in plants has been widely investigated, of which an SA-dependent signaling pathway was reported to be activated in plants exposed to O 3 ( Sharma and Davis, 1997 ).…”