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Timeless
Why do leaves change color?
Chlorophyll breaks down as the days get shorter. The yellows and oranges, carotenoids, were in the leaf all along.
Reds are different. Anthocyanins are made fresh each autumn, from sugars trapped in the leaf.
See the cross-section sketch →
Quiz on Friday
Three pigments: chlorophyll, carotenoids, anthocyanins. Which one is made in autumn?
Draw it out
Map how sunlight, water and CO₂ move through a single leaf.
Timeless
Why do leaves change color?
Chlorophyll breaks down as the days get shorter. The yellows and oranges, carotenoids, were in the leaf all along.
Three pigments
Reds are different. Anthocyanins are made fresh each autumn, from sugars trapped in the leaf as the veins close off.
A cold, sunny week makes the reds brighter. A warm, wet one dulls them.
