Shading during the later growth stage of hybrid rice can reduce grain yield but it can recover once the shading is removed. The chlorophyll levels increase under shading but may not fully return to normal. Low light can lower the photosynthetic rate and affect the transport of nutrients to the grain. Some rice combinations are better at adapting to low light than others. The flag leaf plays a key role in maintaining a high photosynthetic rate and chlorophyll content under low light stress.