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United States Department of Agriculture

Agricultural Research Service

Image Number K4197-7

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Image Number K4197-7

Photoperiodism (discovered in 1918) shows that flowering in plants is controlled by changes in day length. In the 1950s, BARC scientists discover phytochrome, a dual-form plant protein that determines when a plant will start, or put off, flowering. This serves as a core concept in plant physiology in labs all around the country today.

 

Photo by Scott Bauer.


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Last Modified: 3/31/2010
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