Responses of growth, photosynthesis and related physiological characteristics in leaves of Acer ginnala Maxim. to increasing air temperature and/or elevated O₃

Abstract

Regional warming and atmospheric ozone (O 3 ) pollution are two of the most important environmental issues, and commonly coexist in many areas. Both factors have an intense impact on plants. However, little information is available on the combined and interactive effects of air warming and elevated O 3 concentrations on physiological characteristics of plants.• To explore this issue, we studied variations in growth, photosynthesis and physiological characteristics of leaves of Acer ginnala seedlings exposed to control (ambient temperature and O 3 ), increasing air temperature (ambient temperature + 2°C), elevated O 3 (ambient O 3 concentration + 40 ppb) and a combination of the two abiotic factors at different phenological stages by using open-top chambers.• The results showed that increasing air temperature had no significant effect on growth, but increased photosynthesis and antioxidant enzyme activity at the leaf unfolding and defoliation stages. In contrast, elevated O 3 decreased growth and photosynthesis and caused oxidative stress injury in A. ginnala leaves at each phenological stage. The combination of increasing air temperature and elevated O3 improved growth and net photosynthetic rates of tested plants and alleviated the oxidative stress compared to O 3 alone.• Our findings demonstrated that moderate warming was beneficial to A. ginnala at leaf unfolding and defoliation stages, and alleviated the adverse effects of O 3 stress on growth, photosynthesis and the antioxidant system. These results will provide a theoretical reference and scientific basis for the adaptation and response of A. ginnala under regional air warming and atmospheric O 3 pollution.

Investigation of Distinctive Morpho-Physio and Biochemical Alterations in Desi Chickpea at Seedling Stage Under Irrigation, Heat, and Combined Stress

“…It has been reported that heat tolerance in chickpea is strongly associated with an increase in antioxidant enzyme activity and induction of heat shock proteins (Parankusam et al, 2017 ; Tao et al, 2020 ; Wang et al, 2021 ). Under combined stress, a significant increase in POD was found in D-09027 and CH24/07, while SOD activity remained similar as in control.…”

Vigor and Health of Urban Green Resources under Elevated O3in Far East Asia

“…Larch species are associated with ectomycorrhizal (ECM) fungi, which play a critical role in nutrient acquisition for their hosts [4,81,82]). In this study, we investigated species richness and diversity of ECM fungi associated with a hybrid larch (F 1 ) and its parents (Dahurian larch; L. gmelinii var.…”

Individual and Interactive Effects of Elevated Ozone and Temperature on Plant Responses

“…Without confounding changes in humidity, the stomatal response to higher ambient temperatures obviously showed increased stomatal opening in relation to O 3 flux [92,93]. Presently, the plant physiological characteristics resulting from the combined effects and interacting mechanisms of elevated O 3 and temperature are debatable [24,85,87,88,94,95].…”