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Categorized under " General" Definition as written by Terry: The red to purple pigment that shows up in leaves in the fall. The intensity of the colors is determined by the amount of stored carbohydrates plus the number of bright sunny fall days.
Anthocyanin is also increased as phosphate moves out of leaves; the lack of phosphate in young leaves can lead to a telltale purple color produced by anthocyanin.
See also carotene (creates orange to yellow colors); chlorophyll (creates green colors); xanthophyll (creates other yellow colors) and tannin (the remaining brown color after the other colors have disappeared from leaves.) Definition as written by Plant_Geek: A non-plastid bound, water soluble, flavanoid pigment distributed in the cytoplasm that is responsible most red, pink, purple or blue colors found in flowers, fruit and some leaves. Definition as written by jcangemi: A soluble reddish-blue pigment produced by plants when nighttime temperatures are below 45 degrees F and above 32 degrees F. In trees that produce anthocyanin, the resulting autumn color is brilliant red if length of day and temperature conditions are just right. See also carotene and xanthophyll
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