| Autor: |
Singh, Aditya Abha, Ghosh, Annesha, Pandey, Bhanu, Agrawal, Madhoolika, Agrawal, S. B. |
| Zdroj: |
Tropical Ecology; 20230101, Issue: Preprints p1-17, 17p |
| Abstrakt: |
Enhanced anthropogenic activities affect agricultural production in many ways. An integrated study assessing the combined impact of increased tropospheric ozone and carbon dioxide on agriculture is still elusive. An investigation was carried out to study the impacts of elevated levels of CO2(eCO2) and O3(eO3) and their interaction on a C4plant, maize cultivar DHM117, based on growth, physiological, and yield responses using open top chambers. Plant growth parameters remained unaffected due to eCO2exposure. However, the toxic impact of O3was alleviated to some extent under eCO2concentration, as revealed by the increment in total biomass under combined exposure. CO2fertilization increased yield by 13.8%, while a reverse trend was observed under eO3treatment. Lowering of stomatal conductance under eCO2partially protected the plants against O3uptake and resulting phytotoxicity. Stimulation of total phenolic and phenylalanine ammonia lyase (PAL) activity confirmed the activation of defence mechanism to counter the oxidative stress under high O3dose. Likewise, a significant rise in the activities of antioxidative enzymes [peroxidase (POX) and ascorbate peroxidase (APX)] involved in defence mechanisms was observed under ECO2+ EO3, leading to a reduced accumulation of H2O2content in the test plant. This observation was further affirmed by the redundancy analysis, which revealed the significant role of enzymatic antioxidants (explained variance = 15.5%) in compensating for the damaging effect of reactive oxygen species (ROS), translating to significant changes in yield attributes under combined exposure of CO2and O3. |
| Databáze: |
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