Why yellow leaves in autumn?

The molecule is yellow and orange trees instead causes the receiver to dress, but what makes the brilliant red of many plants is still a mystery. Leaf color is revealed to us thatthe level of plant stress.

Leaves in response to temperature drop and the sun low and less of the fall by ceasingproduction of chlorophyll - a substance facilitating tree caught the light and produce energy. Because chlorophyll is sensitive to cold conditions, so in these cases to theearly frost, the leaves will change color rapidly.