File:Colorful Aspen and Chokecherry Leaves, Medano Canyon (44386169945).jpg

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NPS/Patrick Myers

This recent photo of colorful leaves in Medano Canyon above the dunes prompts the question: Where do autumn colors come from?

There are three basic color pigments in most leaves: ⚫ Green chlorophyll is the green substance in leaves that converts sunlight to energy through photosynthesis ⚫Yellow and orange carotenoids are found in bananas, corn, carrots, etc., as well as leaves and grasses ⚫ Red and purple anthocyanins give color to cranberries, strawberries, grapes, etc., and are present within the cells of leaves and grasses.

As days shorten and photosynthesis slows down, green chlorophyll slowly disappears from leaves. Depending on moisture, temperature, and plant genetics, carotenoids and anthocyanins become visible, brightening chilly autumn days!
Date
Source Colorful Aspen and Chokecherry Leaves, Medano Canyon
Author Great Sand Dunes National Park and Preserve

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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.


This image was originally posted to Flickr by Great Sand Dunes National Park and Preserve at https://flickr.com/photos/94707653@N06/44386169945. It was reviewed on 1 January 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

1 January 2022

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current11:50, 4 October 2021Thumbnail for version as of 11:50, 4 October 20214,608 × 3,456 (4.7 MB)Ltn12345 (talk | contribs)Transferred from Flickr via #flickr2commons

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