Light intensity during plant growth affects how well wheat plants protect their photosystem I (PSI) from damage. High-light conditions help wheat plants reduce the risk of PSI photoinhibition, a process where reactive oxygen species harm PSI. Different wheat cultivars respond differently to high-light acclimation, with those grown under high-light conditions showing less PSI photoinhibition. Interestingly, the amount of chlorophyll in leaves is linked to how susceptible PSI is to photoinhibition. Overall, high-light acclimation helps plants defend against PSI damage, and chlorophyll levels play a role in this protection.