A study looked at how a plant hormone called abscisic acid affects cucumber leaves. They used special cameras to take pictures of the leaves and measure things like chlorophyll levels and stomatal conductance. The results showed that abscisic acid caused the plant's stomata to close, reducing the amount of CO2 it takes in. This led to a decrease in photosynthesis efficiency over time. By using these imaging techniques, the researchers were able to see how different parts of the leaves responded differently to the hormone treatment.