Photosynthesis is a significant process that leads to primary production in the biosphere. There are 7,000 billion tons of CO2 in the atmosphere, and it produces more than 100 billion tons of photosynthesis annually. Further evidence suggests that strategies to improve photosynthetic traits can increase plant yield. Nitrogen (N), as a macronutrient, plays a vital role in plant growth. However, photosynthesis and the photosynthetic apparatus are conditioned by environmental variables such as water availability, temperature, [CO2], salinity, and ozone. The omics revolution has made it possible to understand better the genetic mechanisms that regulate stress responses, including the identification of genes and proteins involved in the regulation, adaptation, and adaptation of processes that affect photosynthesis. Various research findings show that UV-B radiation causes changes in plant biological processes, such as damage to the internal structure of photosynthesis or control of its cellular process. Many studies have reported a relationship between photosynthesis and nitrogen supply (N). Here, the physiological response of photosynthesis to N deficiency in leaf structure and N allocation in leaves is summarized.