The PlantScan robot at work. The fluorescence in a tray of Arabidopsis plants (above) shows the efficiency with which each plant, and even parts of the same plant, carry out photosynthesis. Red is the highest efficiency as most of the usable blue light is absorbed; yellow is intermediate; blue-green the lowest.
A 3D heat map (below) scans a corn plant to see which parts have breathing pores open. Open ones suck in more CO2.