A North American leaf with multiple colors across it. Thus, the leaves of summer are characteristically green. In this leaf, the veins are still green, while the other tissue is turning red. Something like autumn pdf their food-manufacturing process, the chlorophylls break down, thus are being continually “used up”.
During the growing season, however, the plant replenishes the chlorophyll so that the supply remains high and the leaves stay green. As this cork layer develops, water and mineral intake into the leaf is reduced, slowly at first, and then more rapidly. During this time, the chlorophyll begins to decrease. Often, the veins are still green after the tissues between them have almost completely changed color. LHC II captures light in photosynthesis.