Anthocyanins are chemical molecules produced when a plant is under stress conditions.

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One of the first morphological changes observed was that hypocotyl in treated seeds starting at 50 ppm of copper, showed a clear reddish color indicative of an increased anthocyanin synthesis (see picture on right); the anthocyanin was indentified as cyanidin, this increase was a function of the concentration of copper added. Another characteristic seen in some plants, was the appearing of Agravitopic Gene, this gene inhibits the plant response to gravity.

To see the cyanidin link: 

    Keep on browsing in the mutations that indicated a macroevolutive step from teosinte to  maize.
 

Published in "La importancia biológica de los iones inorgánicos" edited by
Universidad Michoacana.