Leaf Colour Due To

Leaves change color during the autumn because the amounts of pigments change as the leaves prepare to fall from the trees. All leaves gradually lose chlorophyll during the growing season, and this loss accelerates before leaf fall. Learn why leaves change color in the fall and see the chemistry of the pigment molecules responsible for different leaf colors.

In the fall, trees put on a pretty impressive fashion show. Leaves that were green all summer long start to turn bright red, orange, and yellow. But where do these colors come from? It all starts inside the leaf.

Leaves have color because of chemicals called pigments, and there are four main types of pigment in each leaf: Leaves are green in the spring and summer because that's when they are. The factors that influence autumn leaf color are shorter day lengths, weather (primarily cooler temperatures and less moisture) and changing lev-els of leaf pigments. The only constant factor from year to year is the short-ening day length.

As days become shorter and nights grow longer, bio-chemical processes in the leaf initiate changing leaf color. All the other factors vary annually, making. Variations Among Plant Species Not all plants exhibit dramatic leaf color changes; evergreen species like pines retain green needles year-round due to different adaptation strategies focusing on water conservation rather than nutrient recycling.

Deciduous plants vary widely in their fall coloration patterns based on genetic makeup. Why Do Leaves Change Colors in the Fall? Every leaf speaks bliss to me / Fluttering from the autumn tree. In many parts of the world, "leaf peeping" has become a popular attraction as millions travel to see and photograph the spectacular seasonal shifts in leaf colour.

The autumn foliage of some trees show only yellow colors. Others, like many oaks, display mostly browns. All these colors are due to the mixing of varying amounts of the chlorophyll residue and other pigments in the leaf during the fall season.

Other Changes Take Place As the fall colors appear, other changes are taking place. Why do leaves fall? When all these pigments have in turn faded, leaves appear brown due to the unmasking of what remains - waste products from plant metabolism called tannins. Wine gets its bitter taste from these compounds.

In the past, people also used tannins from trees like maple and willow to dye animal skins, turning them into leather. When the chlorophyll level decreases, the synthesis of anthocyanins - which are responsible for the red colour of the leaves - increases. These are the initial stages of leaf senescence that will lead to leaf fall (Figure 1).

[1] 1. Leaf pigment analysis Figure 2. Extraction and separation of leaf pigments.