Stock Photo: Autumn Colorful Trees In The Fingerlakes Of Nys
ID 258863120 © Mccrainemercantile | Megapixl.com
The brilliant shades of red, purple, and crimson come from anthocyanin. Yellows, golds, oranges, and even browns are fairly consistent from year to year, but anthocyanin can be unreliable. Anthocyanin forms as plant sugars accumulate in the leaves because of the ever-constricting abscission layer, which slowly narrows the tubes that allow the tree to resorb nutrients. The more sunlight a leaf is exposed to, the more sugar is produced; the more sugars that accumulate in the leaf, the more anthocyanins are produced, and the redder the leaf becomes. Not all plants are genetically programmed to produce anthocyanins, but some produce reddish foliage all year long, including the well-known Crimson King Norway Maple.
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