Why do leaves turn yellow in autumn? Why do leaves turn yellow in autumn?

1, the leaves of most trees will turn yellow and fall off in autumn, because the chlorophyll in the leaves will graduall

Why do leaves turn yellow in autumn? Why do leaves turn yellow in autumn?

1, the leaves of most trees will turn yellow and fall off in autumn, because the chlorophyll in the leaves will gradually decrease in autumn, and the original color of the leaves will gradually appear. In spring, leaves will carry out photosynthesis and produce a lot of chlorophyll, but in autumn, the light will weaken, the growth rate of trees will slow down, and carotene in leaves will appear.

In fact, yellow is the original hidden color of leaves. The reason why the leaves are green is because they contain a lot of chlorophyll, but in addition to chlorophyll, the leaves also contain red pigment and yellow pigment. When the weather turns cold in autumn and the infusion stops working, the nutrients in the leaves can't be transferred to the branches and leaves, so they will slowly precipitate on the leaves and turn yellow.

There are many trees whose leaves turn yellow in autumn. Common ones are phoenix tree, ginkgo, pomegranate and acacia. Generally speaking, the leaves of plants mainly contain leaf green, lutein and carotene. These three pigments will change due to the change of temperature, so the leaves will show different colors.