In high light environments leaf may minimize absorption to prevent photoinhibition and overheating. Canopy Spectral Distribution. Blue and red wavelengths absorbed by upper leaves. Sun flecks are an important energy source deep in the canopy. Plant Architecture Affects Light Absorption.
Plant architecture influences light capture.
As irradiance increases photosynthesis takes up CO 2 . It differs with species and growth conditions. Eventually an irradiance is reached where increasing light causes no further increase in photosynthesis rate. This irradiance is the Light Saturation Point . It too differs with species and growth conditions.