Ground-level ozone (O) is well recognized as a secondary air pollutant with detrimental effects on plant growth and biochemistry. In a field study, Andrographis paniculata (King of Bitter) was exposed to ambient O and elevated O (AO + 20 ppb) at three growth stages [45, 90, and 135 days after treatment, (DAT)] using open-top chambers. Elevated O stress negatively impacted plant growth, increased cell damage, and induced foliar injuries.
View Article and Find Full Text PDFTropospheric ozone (O) is a long-range transboundary secondary air pollutant, causing significant damage to agricultural crops worldwide. There are substantial spatial variations in O concentration in different areas of India due to seasonal and geographical variations. The Indo-Gangetic Plain (IGP) region is one of the most crop productive and air-polluted regions in India.
View Article and Find Full Text PDFMesembryanthemum crystallinum (Ice plant) is an annual halophytic plant species spread in the coastal areas of the Mediterranean Sea, Egypt. Information about the behaviour of halophytes under the future concentration of ozone (O) is scanty. Therefore, we have assessed the effects of elevated O (ambient + 20 ppb), moderate salinity (200 mM NaCl), and their combined treatment (salinity + elevated O) on various morphological, growth, physiological, biochemical and anatomical parameters of Egyptian ice plant.
View Article and Find Full Text PDFA field study was conducted to understand the physiological responses, yield and grain quality of an old (HUW234) and a modern (HD3118) wheat cultivar exposed to elevated ozone (O). The cultivars were grown under ambient O (NF) and ambient +20 ppb O (NF+) conditions using open-top chambers (OTCs). The comparative study of an old and a modern cultivar showed variable physiological responses under elevated O exposure.
View Article and Find Full Text PDFThe present field study was planned with an objective to unravel the mechanisms behind the differential responses of early and late sown wheat cultivars with respect to their defense capacity to scavenge ROS induced under elevated O (EO). Experiments were performed under ambient and elevated levels of O (ambient + 20 ppb) to plants inside open-top chambers (OTCs). Ozone concentrations, stomatal flux of O and meteorological parameters were measured throughout the experiment.
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