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Originally Posted by runtuff
I believe the loss of leaves and the vibrant colors of fall are caused by the colder temperatures killing the chloroplasts in the leaves which contain the chlorophyll. When the green of the chlorophyll is gone the other vibrant colors are seen.
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If I remember my Botany correctly, the chloroplasts die because the tree forms a barrier at the base of the leaf, obstructing the flow of nutrients. I'm not sure if the temps or the light trigger this barrier, but I tend to think it is the light.
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