Over the course of their evolution, the ancestors of plants incorporated microbes called cyanobacteria and gained the ability to carry out photosynthesis to produce organic matter from inorganic substances. As a result, plants came to play a part in nourishing almost all living organisms. Furthermore, plants developed more sophisticated immune functions thanks to symbiosis with microorganisms called endophytes, evolving in tandem with them, leading to the acquisition of temperature resistance and other functions that minimized the adverse impacts of the external environments. The interests of plants and endophytes are similar, and one might say it was the providence of nature that resulted in their finding common ground after a long time.