The clock controls an enzyme that modifies a protein, D1, which is critical to photosynthesis.

Mattoo explains that every morning, D1 binds phosphorus. This process peaks before noon, providing a plant with a biotiming signal that tells it to adjust its metabolism to face the onset of the day's brightest light. This adjustment likely helps plants fare better when faced with the highest light intensities, which hinder photosynthesis.

Nah, dose kaw kaw before noon then kaw tim.