What is the role of NADPH in photosynthesis?

NADPH plays a critical role in photosynthesis as a reducing agent. During the light-dependent reactions of photosynthesis, light energy is converted into chemical energy, which is stored in the form of ATP and NADPH. NADPH is synthesized from NADP+ when it accepts electrons and protons, effectively being reduced in the process.

In the subsequent light-independent reactions, also known as the Calvin cycle, NADPH donates the high-energy electrons that it carries to drive the synthesis of glucose from carbon dioxide. This reduction process is essential for the transformation of inorganic carbon into organic molecules, enabling the plant to produce the carbohydrates it uses for energy and growth. Thus, the role of NADPH as a reducing agent is fundamental for the biosynthesis during photosynthesis.