The photoinhibition of photosystem II (PSII) depends on the balance between the rate
of energy absorption and the rate of energy dissipation, including the energy flux for photosynthesis.
Photoinhibition decreases the photosynthetic rate and restricts the primary production of the plant. In
contrast, PSII photoinhibition can be regarded as a redox control mechanism that alleviates the excess
light energy. In this study, the genotypic variation of photoinhibition in rice was examined in relation to
the adaptability of photosynthesis to the fluctuating soil water conditions.