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Darci Murakawa Bio 20 Lab Extra Credit 04/21/03 Why Leaves Turn Red 1. Until recently, a popular misconception concerning the functions of anthocyanins was the belief that by increasing the rate of metabolism in leaves, these pigment molecules are able to warm the leaves as well as protect photosynthetic structures from intense sunlight. In addition, it was also thought that anthocyanins are capable of protecting plant tissues against Ultraviolet (UV) radiation, based on observations that UV radiation has the ability to stimulate the synthesis of anthocyanin. However, in actuality these pigments are not well suited for functioning as protection against UV radiation, because they do not strongly absorb wavelengths (UV-B) that are most damaging to the plant tissues. Also, these pigments are produced internally and are thus in a difficult place to effectively provide protection to leaves from UV. 2. One way bright light may cause damage in plants is through photoinhibition- Photoinhibition refers to...

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