Mitigation of Ozone Stress

By Supriya Tiwari and Madhoolika Agrawal

Abstract

The photochemical reactions leading to O3 formation and the variables on which these reactions depend are undergoing rapid alterations owing to the present climate change scenario. The multifarious set-up related to O3 formation in the troposphere makes it difficult to check the continuously increasing concentration of O3 around the globe. O3 concentration has already crossed the standard limit for vegetation set by European Union (EU) in most of the parts of the World, which is evident by a number of O3 induced crop yield reduction studies. Therefore the demand of the time is to develop certain strategies that will help in alleviating the deleterious effects of O3 on plant performance. This target can be achieved by adopting different approaches such as improved agronomic practices; selection of O3 resistant cultivars, improving photosynthetic efficiencies of O3 exposed plants etc. Several strategies have been followed to achieve these targets, important ones being CO2 fertilization and soil nutrient amendments. In addition to this, air quality management practices using CH4 emission control is also considered to be an important strategy in minimizing O3 induced stress in plants. It has been shown that CO2 fertilization increased the carbon input which can be incorporated in plant biomass and subsequently helps in maintaining yield of plants exposed to O3 stress. Treatment of additional nutrient helps in the repair of the O3 injured plants thus sustaining their yield. As apparent through a number of studies, these strategies have proved quite efficient in partially mitigating O3 stress in plants. However, more experimentation is required before confirming the use of these approaches in mitigating O3 injury and implementing them in daily agricultural practices.

This abstract of a chapter in Tropospheric Ozone and its Impacts on Crop Plants (pp 167-189) appeared on the Springer Link website at https://link.springer.com/chapter/10.1007%2F978-3-319-71873-6_5