Why gold leaves in autumn?

Molecules to create the yellow and orange trees instead cause the coat to the collection, but what makes brilliant red trees is still a mystery. The green also revealed to know the level of plant stress.
Leaves respond to the reduced temperature and weak sunlight of autumn and less stop production by chlorophyll - substance facilitate plant start light and create energy. By chlorophyll is sensitive to cold conditions, so in cases like the early dew, leaves will change color very quickly. When creating the green chlorophyll goes down gradually, then the red and yellow pigment - carotene is often distilled in carrots or pumpkin - the dominant leaf surface. "Ingredients to create the yellow and red is always present in leaves throughout the summer, but the green light to go see our new," said Paul Schaberg, a researcher on the botany of the U.S. Agency for Forestry said. Tourists photograph the woods instead leaves reflected on the water in the lake Takimi Kokkaido island of Japan. Photo: AP. Tourists photograph the woods instead leaves reflected on the water in the lake Takimi Hokkaido island of Japan. Photo: AP. However, the vibrant colors of some species is still a mystery for scientists. When to collect, the maple and ash are due to become vibrant red pigment substances (anthocyanins), appear only in the fall. It also gives substance to the red ripe strawberry fruit, apples and red plums. In trees, the red substance of this work sheet as a shield sunlight, prevents harmful rays and ensures the leaves against the light intensity is too strong. It also acts as antifreeze, protecting cells from freezing plant, and also antioxidants. Trees make these substances to react with extreme conditions such as freezing cold to the point, UV light, drought and mold. In addition, the red leaves are also signs of illness and fatigue. If we see the leaves of one or more color red very early - around August - most likely it is to fight fungus or someone driving crashed into. But why trees Left takes effort just to few days dying leaves and then they fall off? "Some people speculate that it leaves to help cope with stress," Schaberg told LiveScience. "If the leaf pigment helps plants survive on little more days, the leaves can help plant acquisitions are good for the trees before falling. Tree will hoarding resources for living the season after boiling. If seen from the relationship between red leaves with the level of environmental pollution, the leaves change when fall crops to be not only a beautiful sight. The scientists hope that the study of pigment leaves will help find out the level of "stress" that plants have to endure and thus know the impact of the environment. One day, leaves will tell us that what trees are found.