Tiny structures give plants iridescent color, aid photosynthesis in shady conditions
Iridescent blue leaves on some begonias aren’t just for show — they help the plants harvest energy in low light.
The begonias’ chloroplasts, which use photosynthesis to convert light into fuel, have a repeating structure that allows the plants to efficiently soak up light. This comes in handy for a plant that lives on the shady forest floor. The structure acts as a “photonic crystal” that preferentially reflects blue wavelengths of light and helps the plant better absorb reds and greens for energy production, scientists report October 24 in Nature Plants.
Colors in plants and animals typically come from pigments, chemicals that absorb certain wavelengths, or colors, of light. In rare cases, plants and animals derive their hues from microstructures. In begonias, such tiny, regular architectures can be found within certain chloroplasts, known as iridoplasts. As light