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Fall Foliage: Why Leaves Change Color |
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USA - For years, scientists have studied how leaves prepare for the annual show of fall color. The molecules behind bright yellows and oranges are well understood, but brilliant reds remain a bit of a mystery.
In response to chilly temperatures and fewer daylight hours, leaves stop producing their green-tinted chlorophyll, which allows them to capture sunlight and make energy. Because chlorophyll is sensitive to the cold, certain weather conditions like early frosts will turn off production more quickly.
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"If making the anthocyanins helps the leaf stay on the tree a little longer, it may help the tree absorb some of the good things before it falls off. The tree can use those resources for the next growing season." |
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