Photosystem I is a key player in converting light into energy in plants. Scientists have used advanced techniques to study how this system works. They found that light-harvesting complexes in photosystem I absorb light and transfer energy to P700, which then starts the process of electron transport. This leads to the production of a strong reductant that plays a crucial role in plant metabolism. By understanding the structure and function of photosystem I, researchers can now explore how it affects plant physiology and metabolic processes.