Molecular Basis of the Evolution of Pathogens Under Changing Climate Conditions

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144 In the last 200 years, environmental changes brought on by both natural and human activity have increased globally. Long-term changes in weather patterns and extreme weather event frequency are referred to as climate change. It is widely understood that infectious diseases can be impacted by climate change. The majority of research on the connections between disease and climate change has been on particular infections, modes of transmission, or the results of a single form of extreme weather. The environmental effects of climate change are becoming increasingly clear. All life forms are affected by the range and survivability of extreme weather events, rising average global temperatures, changing precipitation patterns, and increasing frequency of such events. Each disease may react differently to changes in CO 2 concentrations, temperature, and water availability, which can have positive, neutral, or adverse effects on disease development. Temperature and humidity have an impact on the virulence mechanisms of pathogens, including the generation of toxins and virulence proteins, as well as pathogen reproduction and survival. Plant diseases can adapt to climate change by taking advantage of the current phenotypic plasticity, migrating to regions with favorable climates, or evolving new traits. Research is underway to develop indicators and predictive methods for locating disease outbreaks in the future. The populations of pathogens exhibit a wide range of genetic characteristics that have been a topic of interest among researchers in the origins and evolution of infectious disease. It is impossible to forecast how climate change will affect plant pathogens, but given that they have a greater range of adaptive mechanisms than their hosts and faster generation rates, they will likely have more opportunities to adapt and evolve. Due to the complex and interacting nature of these events, it can be challenging to identify the key point(s) that triggered the onset of a disease, which may have occurred millions of years ago during the coevolution of the host with its pathogen. Therefore, it is not unexpected that the molecular processes leading to the genesis of any disease have largely remained undiscovered. Therefore, in this manuscript, we are attempting to summarize recent research on the evolution of pathogens, the link between pathogens and climate change, the molecular basis of evolution, and the mechanisms underlying pathogenicity.

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