![]() The carotenoids and anthocyanin that are present in the leaf are then unmasked and show their colors.īrilliant Fall leaves on the Superior National Forest. As night length increases in the autumn, chlorophyll production slows down and then stops and eventually all the chlorophyll is destroyed. ![]() Most anthocyanins are produced in the autumn, in response to bright light and excess plant sugars within leaf cells.ĭuring the growing season, chlorophyll is continually being produced and broken down and leaves appear green. Trees in the temperate zones store these sugars for the winter dormant period.īoth chlorophyll and carotenoids are present in the chloroplasts of leaf cells throughout the growing season. It is necessary for photosynthesis, the chemical reaction that enables plants to use sunlight to manufacture sugars for food.
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