Along with cooler nights, the colors of fall are arriving across the state.
The reason for the season is rooted in science and provides an opportunity for hands-on learning about autumn., an Alabama Cooperative Extension System regional agent, said leaf color is driven by their composition.
The green color in a leaf directly correlates to the amount of sunlight it receives during photosynthesis, the food-making process of plants. As daylight wanes during the fall, so does the amount of adequate sunlight needed to make food for trees. This causes them to go dormant. Ultimately, this reduction of resources causes chlorophyll in the leaf cells to break down and disappear – allowing other colors to show.“Recent drought has put added stress on trees,” Kelley said.
One of the first species to signal a change each year is an unpopular selection. The terribly invasive Chinese tallow tree, commonly referred to as the popcorn tree, is a reliable producer of color each year. It serves as the indicator that fall is on its way with its bright colors of all shades.
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