Isn't it that when winter approaches temperature goes down and the tree spends more of its energy not delivering chlorophyll to the leaves because they will fall off soon. So the other pigments in the leaves take over. Also less and less sun as winter approaches so no need for as much chlorophyll(greenness) for photosynthesis.
Basically the leaf kills itself because new ones will come again in the spring and it would rather spend more energy on the foundations of the tree and not the sun absorbing leafs.
Basically the leaf kills itself because new ones will come again in the spring and it would rather spend more energy on the foundations of the tree and not the sun absorbing leafs.
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